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02.11.2021CouncilPacket Ammon City Council February11,2021 MayorColettiandCityCouncilmembers: ApprovalofUpdatedFloodplainOrdinance StaffPresenting: Tracy Bono, City Engineer/Public Works Director Recommendation -StaffrecommendsapprovingtheUpdatedFloodplainOrdinance SummaryofAnalysis 1.Requirement from IDWR and FEMA to update our ordinance to meet minimum National Flood InsuranceProgramrequirements. Financial Impact 1.No financial impact Motion °„fkf„‡z b„n‡„zndfda*n‡*vf„u± Attachments: 2135 South Ammon Rd., Ammon, Idaho 83406City Hall: (208) 612-4000 www.ci.ammon.id.us Page|1 ORDINANCE NO. 657 CITY OF AMMON ANORDINANCEOFTHECITYOFAMMON,OFTHESTATEOFIDAHO, REPEALINGANDREPLACINGTITLE7,CHAPTER10,FLOODPLAIN REQUIREMENTS,TOALIGNAMMONMUNICIPALCODEWITH FEDERALFLOODPLAINDEVELOPMENTSTANDARDS;PROVIDINGA SEVERABILITYCLAUSE;PROVIDINGAREPEALERCLAUSE;AND PROVIDING AN EFFECTIVE DATE. WHEREAS, the City of Ammon has heretofore adopted ordinance number 191 and an amending ordinance number 216, and a further amending ordinance number 232 providing for the floodplain requirements within the City of Ammon, Bonneville County, Idaho; and WHEREAS, subsequent amendments to the floodplain requirements have been made to align the Ammon City Ordinance with the Federal floodplain development requirements; and WHEREAS, the most recent amendment to the federal floodplain requirements was by Ordinance 608, which revised requirements to further align the Ammon City Ordinance with Federal requirements; and WHEREAS, Ordinance 657 repeals and replaces previous versions of the floodplain requirements to fully and comprehensively align the Ammon City Ordinance with the Federal requirements; and WHEREAS, said previous ordinances have been codified, and the current ordinance will be codified, within the Codified Ordinances of the City of Ammon as Chapter 10 Title 7. NOW, THEREFORE, be it hereby ordained by the Mayor and City Council of the City of Ammon that Ordinance 657 is adopted as follows: Section1.Title10,Chapter10,FloodPlainRequirementsisherebyrepealedandreplacedwithExhibitA to this ordinance and retitle Floodplain Requirements. Section 2. Repeal of Conflicting Provisions. All provisions of the current Code or ordinances of the City of Ammon which conflict with the provisions of this ordinance are hereby repealed to the extent of such conflict. Section 3. Severability. This ordinance is hereby declared to be severable. Should any portion of this ordinance be declared invalid by a court of competent jurisdiction, the remaining provisions shall continue in full force and effect and shall be read to carry out the purpose(s) of the ordinance before the declaration of partial invalidity. Section 4. Effective Date. This ordinance entitled Ordinance No. 657 shall be effective upon its passage and publication as provided by law. Enacted by the City Council as Ordinance No. 657 an ordinance of the City of Ammon on the 11 day of February, 2021. Approved by the Mayor on the 11 day of February, 2021. CITY OF AMMON ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 __________________________________ Sean Coletti, Mayor ATTEST: _______________________________ Kristina Buchan, City Clerk ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 EXHIBIT A FLOODPLAIN REQUIREMENTS ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 CHAPTER 10 FLOODPLAIN REQUIREMENTS 7-10-1: Statement of Purpose 7-10-2: Definitions 7-10-3: General Provisions 7-10-4: Administration 7-10-5: Provisions for Flood Hazard Protection 7-10-6: Minimum Flood Proof Basement Design 7-10-7: Accessory Structures 7-10-8: Flood Insurance Study STATUTORY AUTHORITY: The Legislature of the State of Idaho, pursuant to Idaho Code §§ 46-1020, 46-1023, and 46-1024, authorizes local governments to adopt floodplain management ordinances that identify floodplains and minimum floodplain development standards to minimize flood hazards and protect human life, health, and property. Therefore, the Council of the City of Ammon, Idaho does hereby ordain as follows: 7-10-1: STATEMENT OF PURPOSE: (A) The purpose of this ordinance is to promote public health, safety, and general welfare and to minimize public and private losses due to flood conditions in specific areas by provisions designed to: 1.Protect human life, health, and property; 2.Minimizedamagetopublicfacilitiesandutilitiessuchaswaterpurificationand sewagetreatmentplants,waterandgasmains,electric,telephoneandsewerlines, streets, and bridges located in floodplains; 3.Helpmaintainastabletaxbasebyprovidingforthesounduseanddevelopmentof flood prone areas; 4.Minimize expenditure of public money for costly flood control projects; 5.Minimizetheneedforrescueandemergencyservicesassociatedwithflooding, generally undertaken at the expense of the general public; 6.Minimize prolonged business interruptions; 7.Ensurepotentialbuyersarenotifiedthepropertyisinanareaofspecialfloodhazard; and 8.Ensurethosewhooccupytheareasofspecialfloodhazardassumeresponsibilityfor their actions. (B) Findings of Fact 1. The flood hazard areas of the City of Ammon are subject to periodic inundation which results in loss of life and property, health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base, all of which adversely affect the public health, safety, and general welfare. 2. These flood losses are caused by development in flood hazard areas, which are inadequately elevated, flood-proofed, or otherwise unprotected from flood damages, and by the cumulative effect of obstructions in areas of special flood hazards which increase flood heights and velocities, and when inadequately anchored, damage uses in other areas. Uses that are inadequately floodproofed, elevated, or otherwise protected from flood damage also contribute to the flood loss. 3.Localgovernmentunitshavetheprimaryresponsibilityforplanning,adopting,andenforcing land use regulations to accomplish proper floodplain management. (C).Objectives and Methods of Reducing Flood Losses ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 In order to accomplish its purpose, this ordinance includes methods and provisions to: 1.Requirethatdevelopmentwhichisvulnerabletofloods,includingstructuresandfacilities necessaryforthegeneralhealth,safety,andwelfareofcitizens,beprotectedagainstflooddamage at the time of initial construction; 2.Restrictorprohibitdevelopmentwhicharedangeroustohealth,safety,andpropertyduetowater or erosion hazards, or which increase flood heights, velocities, or erosion; 3.Controlfilling,grading,dredging,andotherdevelopmentwhichmayincreaseflooddamageor erosion; 4.Preventorregulatetheconstructionoffloodbarriersthatwillunnaturallydivertfloodwatersor that may increase flood hazards to other lands; 5.Preserveandrestorenaturalfloodplains,streamchannels,andnaturalprotectivebarrierswhich carry and store flood waters. 7-10-2: DEFINITIONS: Unless specifically defined below, words or phrases used in this chapter shall be interpreted so as to give them the meaning they have in common usage and to give this chapter it’s most reasonable application. ACCESSORY AND AGRICULTURAL STRUCTURES (APPURTENANT STRUCTURE): a structure on the same lot or parcel as a principal structure, the use of which is incidental and subordinate to the principal structure. ADDITION(TOANEXISTINGBUILDING):anextensionorincreaseinthefloorareaorheight of a building or structure. AGRICULTURALSTRUCTURES(APPURTENANTSTRUCTURE):astructurewhichisused exclusivelyinconnectionwiththeproduction,harvesting,storage,raising,ordryingofagricultural commodities and livestock; specifically excludes any structures used for human habitation. APPEAL: A request for a review of the City of Ammon’s interpretation of any provision of this chapter or a request for a variance. AREA OF SHALLOW FLOODING: A designated AO or AH Zone on the Flood Insurance Rate Map (FIRM). The base flood depths range from one to three feet; a clearly defined channel does not exist; the path of flooding is unpredictable and indeterminate; and velocity flow may be evident. AO is characterized as sheet flow and AH indicates ponding. AREA OF SPECIAL FLOOD HAZARD: The land in the floodplain within a community subject to a one percent or greater chance of flooding in any given year. Designation on maps always includes the letters A or V. BASE FLOOD: The flood having a one percent (1%) chance of being equaled or exceeded in any given year. Also referred to as the “100-year flood.” Designation on maps always includes the letters A or V. BASEFLOODELEVATION(BFE):adeterminationbytheFederalInsuranceAdministratorofthe watersurfaceelevationsofthebaseflood,thatis,thefloodlevelthathasaonepercentorgreater chanceofoccurrenceinanygivenyear.WhentheBFEhasnotbeenprovidedinaSpecialFlood HazardArea,itmaybeobtainedfromengineeringstudiesavailablefromaFederal,State,orother sourceusingFEMA-approvedengineeringmethodologies.Thiselevation,whencombinedwiththe Freeboard, establishes the Flood Protection Elevation. BASEMENT: any area of the building having its floor sub grade (below ground level) on all sides. BUILDING: see Structure. CLEANING(IRRIGATION):mowing,cutting,orburningofweeds,treesandothernuisance growth,includingalgaegrowth,applicationofpesticidesaspermitted,removalofbeaverdams,and removaloftrashorotherdebriswhetherfloating,lodgedorotherwiseobstructingtheconveyance of water flow through channels and works. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 CRITICALFACILITIES:facilitiesthatarevitaltofloodresponseactivitiesorcriticaltothehealth andsafetyofthepublicbefore,during,andafteraflood,suchasahospital,emergencyoperations center,electricsubstation,policestation,firestation,nursinghome,school,vehicleandequipment storagefacility,orshelter;andfacilitiesthat,ifflooded,wouldmakethefloodproblemandits impactsmuchworse,suchasahazardousmaterialsfacility,powergenerationfacility,waterutility, or wastewater treatment plant. DATUM:theverticaldatumisabasemeasurementpoint(orsetofpoints)fromwhichall elevationsaredetermined.Historically,thatcommonsetofpointswastheNationalGeodetic VerticalDatumof1929(NGVD29).Theverticaldatumcurrentlyadoptedbythefederal governmentasabasisformeasuringheightsistheNorthAmericanVerticalDatumof1988 (NAVD88) DEVELOPMENT: Any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation, or drilling operations located within the area of special flood hazard. DEVELOPMENT ACTIVITY: any activity defined as Development which will necessitate a Floodplain Development Permit; such as: the construction of buildings, structures, or accessory structures; additions or substantial improvements to existing structures; bulkheads, retaining walls, piers, and pools; the placement of mobile homes; or the deposition or extraction of materials; the construction or elevation of dikes, berms and levees. DIGITALFLOODINSURANCERATEMAP(DFIRM):thedigitalofficialmapofacommunity, issuedbytheFederalInsuranceAdministrator,onwhichboththeSpecialFloodHazardAreasand the risk premium zones applicable to the community are delineated. ELEVATEDBUILDING:forinsurancepurposes,anon-basementbuildingwhichhasitslowest elevatedfloorraisedabovegroundlevelbyfoundationwalls,shearwalls,posts,piers,pilings,or columns. ELEVATIONCERTIFICATE:TheElevationCertificateisanimportantadministrativetoolofthe NFIP.Itisusedtodeterminetheproperfloodinsurancepremiumrate;itisusedtodocument elevationinformation;anditmaybeusedtosupportarequestforaLetterofMapAmendment (LOMA) or Letter of Map Revision based on fill (LOMR-F). ENCLOSURE:anareaenclosedbysolidwallsbelowtheBFE/FPEoranareaformedwhenany spacebelowtheBFE/FPEisenclosedonallsidesbywallsorpartitions.Insectscreeningoropen wood lattice used to surround space below the BFE/RFPE is not considered an enclosure. ENCROACHMENT:theadvanceorinfringementofuses,fill,excavation,buildings,structures,or development into a floodplain, which may impede or alter the flow capacity of a floodplain. EXISTINGCONSTRUCTION:forthepurposesofdeterminingrates,structuresforwhichthe “startofconstruction”commencedbeforetheeffectivedateoftheFIRMorbeforeJanuary1,1975, forFIRMseffectivebeforethatdate.“Existingconstruction”mayalsobereferredtoas“existing structures.” EXISTINGMANUFACTUREDHOMEPARKORMANUFACTUREDHOMESUBDIVISION: amanufacturedhomeparkorsubdivisionwheretheconstructionoffacilitiesforservicingthelots onwhichthemanufacturedhomesaretobeaffixed(including,ataminimum,theinstallationof utilities,theconstructionofstreets,andfinalsitegradingorthepouringofconcretepads)is completedbeforetheeffectivedateoftheoriginalfloodplainmanagementregulationsadoptedby the community, July 15, 1982. EXISTING STRUCTURES: see existing construction. EXPANSIONTOANEXISTINGMANUFACTUREDHOMEPARKORSUBDIVISION:the preparationofadditionalsitesbytheconstructionoffacilitiesforservicingthelotsonwhichthe manufacturinghomesaretobeaffixed(includingtheinstallationofutilities,theconstructionof streets, and either final site grading or the pouring of concrete pads). ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 FLOOD or FLOODING: (a) A general and temporary condition of partial or complete inundation of normally dry land areas from (1) the overflow of inland or tidal waters and/or (2) the unusual and rapid accumulation of runoff of surface waters from any source. (3) Mudslides (i.e., mudflows) which are approximately caused by flooding as defined in paragraph a.2. of this definition and are akin to a river of liquid and flowing mud on the surfaces of normally dry land areas, as when earth is carried by a current of water and deposited along the path of the current. (b) The collapse or subsidence of land along the shore of a lake or other body of water as a result of erosion or undermining caused by waves or currents of water exceeding anticipated cyclical levels or suddenly caused by an unusually high water level in a natural body of water, accompanied by a severe storm, or by an unanticipated force of nature, such as flash flood or an abnormal tidal surge, or by some similarly unusual and unforeseeable event which results in flooding as defined in paragraph a.1. of this definition. FLOODBOUNDARYANDFLOODWAYMAP(FBFM):TheFBFMshowshowthefloodplainis dividedintothefloodwayandfloodfringewherestreamsarestudiedindetail.Theyalsoshow generalfloodplainareaswherefloodplainshavebeenstudiedbyapproximatemethods.(Oldformat Pre 1986) FLOOD ELEVATION DETERMINATION: See Base Flood Elevation (BFE) FLOOD ELEVATION STUDY: See Flood Insurance Study (FIS) FLOODHAZARDBOUNDARYMAP(FHBM):anofficialmapofacommunity,issuedbythe FederalInsuranceAdministrator,wheretheboundariesoftheflood,mudslide(i.e.,mudflow) related erosion areas having special hazards have been designated as Zones A, M, and/or E. FLOOD INSURANCE RATE MAP (FIRM): The official map on which the Federal Insurance Administration has delineated both the areas of special flood hazards and the risk premium zones applicable to the community. FLOOD INSURANCE STUDY: The official report provided by the Federal Insurance Administration that includes flood profiles, the Flood Boundary-Floodway Map, and the water surface elevation of the base flood. FLOODZONE:ageographicalareashownonaFloodHazardBoundaryMap(FHBM)orFlood InsuranceRateMap(FIRM)thatreflectstheseverityortypeoffloodinginthearea,andapplicable insurance rate. FLOODPLAINORFLOOD-PRONEAREA:anylandareasusceptibletobeinginundatedbywater from any source (see definition of “flooding”). FLOODPLAINADMINISTRATOR:theindividualappointedtoadministerandenforcethe floodplain management regulations. FLOODPLAIN DEVELOPMENT PERMIT: any type of permit that is required in conformance with the provisions of this ordinance, prior to the commencement of any development activity. FLOODPLAINMANAGEMENT:theoperationofanoverallprogramofcorrectiveandpreventive measuresforreducingflooddamage,includingbutnotlimitedtoemergencypreparednessplans, flood control works, and floodplain management regulations. FLOODPLAINMANAGEMENTREGULATIONS:zoningordinances,subdivisionregulations, buildingcodes,healthregulations,specialpurposeordinances(suchasafloodplainordinance, gradingordinance,anderosioncontrolordinance),andotherapplicationsofpolicepower.Theterm describessuchstateorlocalregulations,inanycombinationthereof,whichprovidestandardsfor the purpose of flood damage prevention and reduction. FLOODPROOFING:anycombinationofstructuralandnon-structuraladditions,changes,or adjustmentstostructureswhichreduceoreliminateflooddamagetorealestateorimprovedreal property, water and sanitary facilities, structures and their contents. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 FLOOD PROTECTION ELEVATION (FPE): the Base Flood Elevation plus the Freeboard. •In“SpecialFloodHazardAreas”whereBaseFloodElevations(BFEs)havebeen determined, this elevation shall be the BFE plus 2 feet of freeboard; and •In“SpecialFloodHazardAreas”wherenoBFEhasbeenestablished,thiselevationshallbe at least 2 feet above the highest adjacent grade. FLOODPROTECTIONSYSTEM:thosephysicalstructuralworksforwhichfundshavebeen authorized,appropriated,andexpendedandwhichhavebeenconstructedspecificallytomodify floodinginordertoreducetheextentoftheareawithinacommunitysubjecttoa“specialflood hazard”andtheextentofthedepthsofassociatedflooding.Suchasystemtypicallyincludesdams, reservoirs,levees,ordikes.Thesespecializedfloodmodifyingworksarethoseconstructedin conformance with sound engineering standards. FLOODWAY: The channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot. FREEBOARD:afactorofsafetyusuallyexpressedinfeetaboveafloodlevelforthepurposesof floodplainmanagement.Freeboardtendstocompensateforthemanyunknownfactorsthatcould contributetofloodheightsgreaterthantheheightcalculatedforaselectedsizefloodandfloodway conditions,suchaswaveaction,obstructedbridgeopenings,debrisandicejams,andthe hydrologiceffectsofurbanizationinawatershed.TheBaseFloodElevation(BFE)plusthe freeboard establishes the Flood Protection Elevation (FPE). Freeboard shall be 2 feet. FUNCTIONALLYDEPENDENTUSE:afacilitythatcannotbeusedforitsintendedpurpose unlessitislocatedorcarriedoutincloseproximitytowater,suchasadockingorportfacility necessaryfortheloadingandunloadingofcargoorpassengers,shipbuilding,orshiprepair facilities. The term does not include long-term storage, manufacture, sales, or service facilities. GENERALIRRIGATIONFLOODPLAINDEVELOPMENTPERMIT(GIFDPERMIT):The intentoftheGIFDpermitistocollectivelyauthorizelow-to-noimpactirrigationanddrainage developmentactivitiesorusesinthefloodplainwhichinherentlydonotincreasetheBFE.GIFD permitsapplytoallqualifyingactivitieswithinthespatialextentsofanirrigationdeliveryor drainagesystemandwithintheregulatoryfloodwayorSFHA,overapredeterminedperiodoftime, nottoexceedfiveyears.IssuanceofaGIFDpermitrequirescoordinationbetweentheirrigation entity and the Floodplain Administrator. HIGHESTADJACENTGRADE(HAG):thehighestnaturalelevationofthegroundsurfaceprior toconstruction,adjacenttotheproposedwallsofastructure.RefertotheFEMAElevation Certificate for HAG related to building elevation information. HISTORIC STRUCTURE: a structure that is: a.ListedindividuallyintheNationalRegisterofHistoricPlaces(alistingmaintainedbytheU.S. DepartmentofInterior)orpreliminarilydeterminedbytheSecretaryoftheInteriorasmeeting the requirements for individual listing on the National Register; b.CertifiedorpreliminarilydeterminedbytheSecretaryoftheInteriorascontributingtothe historicalsignificanceofaregisteredhistoricdistrictortoadistrictpreliminarilydeterminedby the Secretary to qualify as a registered historic district; c.Individuallylistedonastateinventoryofhistoricplacesanddeterminedaseligiblebystates withhistoricpreservationprogramswhichhavebeenapprovedbytheSecretaryoftheInterior; or d.Individuallylistedonalocalinventoryofhistoricplacesanddeterminedaseligibleby communities with historic preservation programs that have been certified either: 1.by an approved state program as determined by the Secretary of the Interior, or 2.directly by the Secretary of the Interior in states without approved programs. LETTEROFMAPCHANGE(LOMC):ageneraltermusedtorefertotheseveraltypesof revisionsandamendmentstoFIRMsthatcanbeaccomplishedbyletter.TheyincludeLetterof MapAmendment(LOMA),LetterofMapRevision(LOMR),andLetterofMapRevisionbasedon Fill (LOMR-F) •LETTEROFMAPAMENDMENT(LOMA):anofficialamendment,byletter,toaneffective NationalFloodInsuranceProgram(NFIP)map.ALOMAestablishesaproperty’sorstructure’s ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 locationinrelationtotheSpecialFloodHazardArea(SFHA).LOMAsareusuallyissued becauseapropertyorstructurehasbeeninadvertentlymappedasbeinginthefloodplainbutis actually on natural high ground above the base flood elevation. •LETTEROFMAPREVISION(LOMR):FEMA'smodificationtoaneffectiveFloodInsurance RateMap(FIRM)oraFloodBoundaryandFloodwayMap(FBFM)orboth.LOMRsare generallybasedontheimplementationofphysicalmeasuresthataffectthehydrologicor hydrauliccharacteristicsofafloodingsourceandthusresultinthemodificationoftheexisting regulatoryfloodway,theeffectiveBaseFloodElevations(BFEs),ortheSpecialFloodHazard Area(SFHA).TheLOMRofficiallyrevisestheFloodInsuranceRateMap(FIRM)orFlood BoundaryandFloodwayMap(FBFM),andsometimestheFloodInsuranceStudy(FIS)report, andwhenappropriate,includesadescriptionofthemodifications.TheLOMRisgenerally accompanied by an annotated copy of the affected portions of the FIRM, FBFM, or FIS report. •LETTEROFMAPREVISIONBASEDONFILL(LOMR-F):FEMA'smodificationofthe SpecialFloodHazardArea(SFHA)shownontheFloodInsuranceRateMap(FIRM)basedon theplacementoffilloutsidetheexistingregulatoryfloodway.TheLOMR-Fdoesnotchange the FIRM, FBFM, or FIS report. •CONDITIONALLETTEROFMAPREVISION(CLOMR):Aformalreviewandcommentas towhetheraproposedfloodprotectionprojectorotherprojectcomplieswiththeminimum NFIPrequirementsforsuchprojectswithrespecttodelineationofspecialfloodhazardareas.A CLOMRdoesnotrevisetheeffectiveFloodInsuranceRateMap(FIRM)orFloodInsurance Study(FIS).Uponsubmissionandapprovalofcertifiedas-builtdocumentation,aLetterofMap Revision(LOMR)maybeissuedbyFEMAtorevisetheeffectiveFIRM.BuildingPermits and/orFloodDevelopmentPermitscannotbeissuedbasedonaCLOMR,becauseaCLOMR does not change the NFIP map. LEVEE:aman-madestructure,usuallyanearthenembankment,designedandconstructed accordingtosoundengineeringpractices,tocontain,control,ordiverttheflowofwatersoasto provide protection from temporary flooding. LEVEESYSTEM:afloodprotectionsystemthatconsistsofalevee,orlevees,andassociated structures,suchasclosureanddrainagedevices,whichareconstructedandoperatedinaccordance with sound engineering practices. LOWESTADJACENTGRADE(LAG):thelowestpointofthegroundlevelnexttothestructure. Refer to the FEMA Elevation Certificate for LAG related to building elevation information. LOWEST FLOOR: The lowest floor of the lowest enclosed area (including basement). An unfinished or flood resistance enclosure, usable solely for parking of vehicles, building access, or storage, in an area other than a basement area, is not considered a building’s lowest floor, provided that such enclosure is not built so as to render the structure in violation of the applicable non-elevation design requirements of this chapter found at Section 7-10-5 (B) 1(b). MAINTENANCE(IRRIGATION):theactofongoingupkeepofexistingstructuresrequiredto keepchannelsinaconditionadequatetosupporttheconveyanceofirrigationanddrainagewater (thisdoesnotincludethecompletereplacementorsubstantialreplacementofanexistingstructure). Maintenanceisfurtherdefinedasthecareorupkeepofchannels,works,appurtenances,easements, utilitycorridorsandproperty;tokeepinanexistingstate,specifiedstateofrepair,andefficiency; returntoaformercondition,elevation,place,andposition;topreservefromfailureordecline;or repairorrenovatesoastoreturnittoitsoriginalcondition.Maintenancedoesnotincludedredging as defined herein. MANUFACTURED HOME: A structure, transportable in one or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when connected to the required utilities. For floodplain management purposes the term “manufactured home” also includes park trailers, travel trailers, and other similar vehicles placed on a site for greater than 180 consecutive days. For insurance purposes the term “manufactured home” does not include park trailers, travel trailers, and other similar vehicles. MANUFACTURED HOME PARK OR SUBDIVISION: A parcel (or contiguous parcels) of land divided into two (2) or more manufactured home lots for rent or sale. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 MARKETVALUE:thebuildingvalue,notincludingthelandvalueandthatofanyaccessory structuresorotherimprovementsonthelot.Marketvaluemaybeestablishedbyindependent certifiedappraisal;replacementcostdepreciatedforageofbuildingandqualityofconstruction (Actual Cash Value); or adjusted tax assessed values. MEANSEALEVEL:forpurposesoftheNationalFloodInsuranceProgram(NFIP),theNational GeodeticVerticalDatum(NGVD)of1929orotherdatum(suchasNorthAmericaVerticalDatum of1988-NAVD88)towhichBaseFloodElevations(BFEs)shownonacommunity’sFIRMare referenced. MUDSLIDE(I.E.,MUDFLOW):describesaconditionwherethereisariver,flow,orinundation ofliquidmuddownahillsideusuallyasaresultofadualconditionoflossofbrushcoverandthe subsequentaccumulationofwateronthegroundprecededbyaperiodofunusuallyheavyor sustainedrain.Amudslide(i.e.,mudflow)mayoccurasadistinctphenomenonwhilealandslideis inprogress,andwillberecognizedassuchbytheAdministratoronlyifthemudflow,andnotthe landslide, is the proximate cause of damage that occurs. MUDSLIDE(I.E.,MUDFLOW)AREAMANAGEMENT:theoperationofanoverallprogramof correctiveandpreventivemeasuresforreducingmudslide(i.e.,mudflow)damage,includingbut notlimitedtoemergencypreparednessplans,mudslidecontrolworks,andfloodplainmanagement regulations. MUDSLIDE(I.E.,MUDFLOW)PRONEAREA:anareawithlandsurfacesandslopesof unconsolidated material where the history, geology, and climate indicate a potential for mudflow. NATIONALFLOODINSURANCEPROGRAM(NFIP):TheNFIPisaFederalprogramcreated byCongresstomitigatefuturefloodlossesnationwidethroughsound,community-enforced buildingandzoningordinancesandtoprovideaccesstoaffordable,federallybackedflood insurance protection for property owners. NEW CONSTRUCTION: Structures for which the “start of construction” commenced on or after the effective date of this chapter. Any construction started after July 15, 1982 and before the effective start date of this floodplain management ordinance is subject to the ordinance in effect at the time the permit was issued, provided the start of construction was within 180 days of permit issuance. RECREATIONAL VEHICLE: a vehicle that is: a.Built on a single chassis, and b.400 square feet or less when measured at the largest horizontal projection, and c.Designed to be self-propelled or permanently towed by a light duty truck, and d.Designedprimarilynotforuseasapermanentdwellingbutastemporarylivingquartersfor recreational, camping, travel, or seasonal use. REGULATORY FLOODWAY: See Floodway REMEDYAVIOLATION:tobringthestructureorotherdevelopmentintocompliancewithState orlocalfloodplainmanagementregulations,or,ifthisisnotpossible,toreducetheimpactsofits non-compliance.Waysthatimpactsmaybereducedincludeprotectingthestructureorother affecteddevelopmentfromflooddamages,implementingtheenforcementprovisionsofthe ordinanceorotherwisedeterringfuturesimilarviolations,orreducingFederalfinancialexposure with regard to the structure or other development. REPAIR(IRRIGATION):therestorationtogoodorsoundconditionsofanypartofanexisting structure,channel,channelbank,orserviceroadforthepurposeofmaintenance(thisdoesnot includethecompletereplacementorsubstantialreplacementofanexistingstructure).Repairdoes not include dredging as defined herein. REPETITIVELOSSSTRUCTURE:AnNFIP-insuredstructurethathashadatleasttwopaidflood losses of more than $1,000 each in any 10-year period since 1978. RIVERINE: relating to, formed by, or resembling a river (including tributaries), stream, brook, etc. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 SPECIALFLOODHAZARDAREA(SFHA):thelandinthefloodplainwithinacommunity subjecttoaonepercent(1%)orgreaterchanceoffloodinginanygivenyear.Forpurposesofthese regulations,theterm“specialfloodhazardarea”issynonymousinmeaningwiththephrase“areaof special flood hazard” START OF CONSTRUCTION: Includes substantial improvement and means the date the building permit was issued, provided the actual start of construction, repair, reconstruction, placement, or other improvement was within 180 days of the permit date. The actual start means either the first placement of permanent construction of a structure on a site, such as the pouring of slabs or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation; or the placement of a manufactured home on a foundation. Permanent construction does not include land preparation such as clearing, grading, and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footing, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property of accessory buildings such as garages or sheds not occupied as dwelling units or not as part of the main structure. For a substantial improvement, the actual start of construction means the first alteration of any wall, ceiling, floor, or other structural part of a building, whether or not that alteration affects the external dimensions of the building. STRUCTURE: A walled and roofed building, including a gas or liquid storage tank that is principally above ground,as well as a manufactured home. SUBSTANTIAL DAMAGE: damage of any origin sustained by a structure whereby the cost of restoring the structure to its before-damaged condition would equal or exceed 50 percent (50%) of its market value before the damage occurred. See definition of “substantial improvement” SUBSTANTIAL IMPROVEMENT: Any repair, reconstruction, or improvement of a structure, the cost of which equals or exceeds fifty percent (50%) of the market value of the structure before the “start of construction” of the improvement. This term includes structures which have incurred “substantial damage”, regardless of the actual repair work performed. The term does not, however, include either: •Anyprojectforimprovementofastructuretocorrectexistingviolationsofstateorlocal health,sanitary,orsafetycodespecificationswhichhavebeenidentifiedbythelocalcode enforcementofficialandwhicharetheminimumnecessarytoassuresafelivingconditions; or •Anyalterationofa“historicstructure”,providedthatthealterationwillnotprecludethe structure'scontinueddesignationasa“historicstructure”andthealterationisapprovedby variance issued pursuant to this ordinance TECHNICALBULLETINSANDTECHNICALFACTSHEETS:FEMApublicationsthatprovide guidanceconcerningthebuildingperformancestandardsoftheNFIP,whicharecontainedinTitle 44oftheUSCodeofFederalRegulations§60.3.Thebulletinsandfactsheetsareintendedforuse primarilybyStateandlocalofficialsresponsibleforinterpretingandenforcingNFIPregulations andbymembersofthedevelopmentcommunity,suchasdesignprofessionalsandbuilders.New bulletins,aswellasupdatesofexistingbulletins,areissuedperiodicallyasneeded.Thebulletinsdo notcreateregulations.Rathertheyprovidespecificguidanceforcomplyingwiththeminimum requirements of existing NFIP regulations. ItshouldbenotedthatTechnicalBulletinsandTechnicalFactSheetsprovideguidanceonthe minimumrequirementsoftheNFIPregulations.Stateorcommunityrequirementsthatexceedthose oftheNFIPtakeprecedence.Designprofessionalsshouldcontactthecommunityofficialsto determinewhethermorerestrictiveStateorlocalregulationsapplytothebuildingorsitein question.AllapplicablestandardsoftheStateorlocalbuildingcodemustalsobemetforany building in a flood hazard area. TEMPERATURECONTROLLED:havingthetemperatureregulatedbyaheatingand/orcooling system, built-in or appliance. VARIANCE: A grant of relief from the requirements of this chapter which permits construction in a manner that would otherwise be prohibited by this chapter. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 VIOLATION: the failure of a structure or other development to be fully compliant with the community's floodplain management regulations. A structure or other development without the Finished Construction Elevation Certificate, other certifications, or other evidence of compliance required in 44 CFR § 60.3(b)(5), (c)(4), (c)(10), (d)(3), (e)(2), (e)(4), or (e)(5) is presumed to be in violation until such time as that documentation is provided. WATERSURFACEELEVATION:theheight,inrelationtotheNationalGeodeticVerticalDatum (NGVD)of1929ortheNorthAmericanVerticalDatum(NAVD)of1988(orotherspecified datum),offloodsofvariousmagnitudesandfrequenciesinthefloodplainsofcoastalorriverine areas. WATERCOURSE: a lake, river, creek, stream, wash, channel, or other topographic feature on or over which waters flow at least periodically. Watercourse includes specifically designated areas in which substantial flood damage may occur. 7-10-3: GENERAL PROVISIONS: (A) Lands to Which This Chapter Applies: This chapter shall apply to all areas of special flood hazards within the jurisdiction of the City of Ammon. Nothing in this ordinance is intended to allow uses or structures that are otherwise prohibited by the zoning ordinance. (B) Basis for Establishing the Areas of Special Flood Hazard: The areas of special flood hazard identified by the Federal Insurance Administration in a scientific and engineering report entitled “The Ammon Flood Insurance Study and Maps for Ammon, Idaho,” dated July 19, 1982, with accompanying Flood Insurance Rate Maps (FIRM) is hereby adopted by this reference and declared to be a part of this chapter. The Flood Insurance Study is on file at City Hall, City of Ammon, 2135 South Ammon Road, Idaho 83406. (C) Penalties for Noncompliance: No structure of land shall hereafter be constructed, located, extended, converted, or altered without full compliance with the terms of this chapter and other applicable regulations. Violation of the provisions of this chapter by failure to comply with any of its requirements (including violation of conditions and safeguards established in connection with conditions) shall constitute a misdemeanor. Any person who violates this ordinance or fails to comply with any of its requirements shall upon conviction thereof be fined not more than Three Hundred Dollars ($300) or imprisoned for not more than ninety (90) days, or both, for each violation, and in addition shall pay all costs and expenses involved in the case. Nothing herein contained shall prevent the City of Ammon from taking such other lawful action as is necessary to prevent or remedy any violation. (D) Abrogation and Greater Restrictions: This chapter is not intended to repeal, abrogate, or impair any existing easements, covenants, or deed restrictions. However, where this chapter and another chapter, ordinance, easement, covenant, or deed restriction conflict or overlap, whichever imposes the more stringent restrictions shall prevail. (E) Interpretation: In the interpretation and application of this chapter, all provisions shall be: 1. Considered as minimum requirements; 2. Liberally construed in favor of the governing body; and 3. Deemed neither to limit nor repeal any other powers granted under state statutes. (F) Warning and Disclaimer of Liability: The degree of flood protection required by this chapter is considered reasonable for regulatory purposes and is based on scientific and engineering considerations. Larger floods can and will occur on rare occasions. Flood heights may be increased by man-made or natural causes. This chapter does not imply that land outside the areas of special flood hazards or uses permitted within such areas will be free from flooding or flood damages. This chapter shall not create liability on the part of the City of Ammon, any officer or employee thereof, or the Federal Insurance ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 Administration for any flood damages that result from reliance on this chapter or any administrative decision lawfully made hereunder. 7-10-4: ADMINISTRATION (A) Establishment of Development Permit: A development permit shall be obtained before construction or development begins within any area of special flood hazard established in Section 7-10-3-(B) above. The permit shall be for all structures including manufactured homes, as set forth in Section 7-10-2, Definitions, and for all other development including fill and other activities, also as set forth in Section 7-10-2, Definitions. (B) Designation of the Local Administrator: The City of Ammon City Engineer is hereby appointed to administer and implement this chapter by granting or denying development permit applications in accordance with its provisions. (C) Duties and Responsibilities of the Local Administrator: Duties of the City Engineer shall include, but not be limited to: 1. Permit Review: (a) Review all development permits to determine that the permit requirements of this chapter have been satisfied. (b) Review all development permits to determine that all necessary permits have been obtained from those federal, state, or local governmental agencies from which prior approval is required. (c) Review all development permits to determine if the proposed development is located in the floodway. If located in the floodway, assure that the encroachment provisions of Section 7-10-5(C) 1 are met. 2. Use of Other Flood Data: When base flood elevation and floodway data have not been provided in accordance with Section 7-10-3(B), Basis for Establishing the Areas of Special Flood Hazard, the City Engineer shall obtain, review, and reasonably utilize any base flood elevation and floodway data available from a federal, state, or source, in order to administer Section 7-10-5(B)1, Specific Standards, Residential Construction, Section 7-10-5(B)2, Specific Standards, Nonresidential Construction, and Section 7-10-5(C), Floodways. 3. Information to be Obtained and Maintained: (a) Where base flood elevation data is provided through the Flood Insurance Study or required as in Section 7-10-4(C)2, obtain and record the actual elevation (in relation to mean sea level) of the lowest habitable floor (including basement) of all new or substantially improved structures, and whether or not the structure contains a basement. (b) For all new or substantially improved floodproofed structures: (1) Verify and record the actual elevation (in relation to mean sea level), and (2) Maintain the floodproofing certifications required in Section 7-10-5 (B) 3. (3) Maintain for public inspection all records pertaining to the provisions of this chapter. 4. Alteration of Watercourses: (a) Notify adjacent communities and the Idaho Water Resource Board prior to any alteration or relocation of a water course, and submit evidence of such notification to the Federal Insurance Administration. (b) Require that maintenance is provided within the altered or relocated portion of said water course so that the flood carrying capacity is not diminished. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (c). Interpretation of FIRM Boundaries: Make interpretations where needed, as to exact location of the boundaries of the areas of special flood hazards (for example, where there appears to be a conflict between a mapped boundary and the actual field conditions). The person contesting the location of the boundary shall be given a reasonable opportunity to appeal the interpretation. Such appeals shall be granted consistent with the appeals procedure as provided in Section 7-10-4(D)4 of this chapter and the standards of Section 1910.6 of the rules and regulations of the National Flood Insurance Program (24 CFR 1909, etc.) (d). When floodproofing is utilized for a particular structure, obtain and maintain certifications from a registered professional engineer or architect in accordance with the provisions of 7-10-3(b) and 7-10-5 (B)2. (e).WhenBaseFloodElevation(BFE)dataisprovidedbutnofloodwaydatahas beenprovidedinaccordancewiththeprovisionsof7-10-3(B)requirethatnonew construction,substantialimprovements,orotherdevelopment(includingfill)shall bepermittedwithinZonesAEonthecommunity'sFIRM,unlessitisdemonstrated thatthecumulativeeffectoftheproposeddevelopment,whencombinedwithall otherexistingandanticipateddevelopment,willnotincreasethewatersurface elevationofthebasefloodmorethanonefootatanypointwithinthecommunity. (This is a Hydraulic & Hydrology Analysis) (f).Makeon-siteinspectionsofworkinprogress.Astheworkpursuanttoa floodplaindevelopmentpermitprogresses,theFloodplainAdministratorshall makeasmanyinspectionsoftheworkasmaybenecessarytoensurethatthework isbeingdoneaccordingtotheprovisionsofthelocalordinanceandthetermsof thepermit.Inexercisingthispower,theFloodplainAdministratorhasaright, uponpresentationofpropercredentials,toenteronanypremiseswithinthe jurisdictionofthecommunityatanyreasonablehourforthepurposesofinspection or other enforcement action. (g).Issuestop-workordersasrequired.Wheneverabuildingorpartthereofis beingconstructed,reconstructed,altered,orrepairedinviolationofthisordinance, theFloodplainAdministratormayordertheworktobeimmediatelystopped.The stop-workordershallbeinwritinganddirectedtothepersondoingorinchargeof thework.Thestop-workordershallstatethespecificworktobestopped,the specificreason(s)forthestoppage,andthecondition(s)underwhichtheworkmay be resumed. Violation of a stop-work order constitutes a misdemeanor. (h).Revokefloodplaindevelopmentpermitsasrequired.TheFloodplain Administratormayrevokeandrequirethereturnofthefloodplaindevelopment permitbynotifyingthepermitholderinwritingstatingthereason(s)forthe revocation.Permitsshallberevokedforanysubstantialdeparturefromthe approvedapplication,plans,andspecifications;forrefusalorfailuretocomply withtherequirementsofStateorlocallaws;orforfalsestatementsor misrepresentationsmadeinsecuringthepermit.Anyfloodplaindevelopment permitmistakenlyissuedinviolationofanapplicableStateorlocallawmayalso be revoked. (i).MakeperiodicinspectionsthroughouttheSpecialFloodHazardAreaswithin thejurisdictionofthecommunity.TheFloodplainAdministratorandeach memberofhisorherinspectionsdepartmentshallhavearight,uponpresentation ofpropercredentials,toenteronanypremiseswithintheterritorialjurisdictionof thedepartmentatanyreasonablehourforthepurposesofinspectionorother enforcement action. (g. Review, provide input, and make recommendations for variance requests. (j).Maintainacurrentmaprepositorytoinclude,butnotlimitedto,theFIS Report,FIRMandotherofficialfloodmaps,andstudiesadoptedinaccordance withtheprovisionsofArticleIII,SectionBofthisordinance,includingany revisionstheretoincludingLettersofMapChange,issuedbyFEMA.Notifythe NFIP State Coordinator and FEMA of your community’s mapping needs. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (k).CoordinaterevisionstoFISreportsandFIRMs,includingLettersofMap Revision Based on Fill (LOMR-Fs) and Letters of Map Revision (LOMRs). (l).Acommunity'sbasefloodelevationsmayincreaseordecreaseresultingfrom physicalchangesaffectingfloodingconditions.Assoonaspracticable,butnot laterthansixmonthsafterthedatesuchinformationbecomesavailable,a communityshallnotifytheFederalInsuranceAdministrator(FIA)ofthechanges bysubmittingtechnicalorscientificdatainaccordancewiththispart.Sucha submissionisnecessarysothatuponconfirmationofthosephysicalchanges affectingfloodingconditions,riskpremiumratesandfloodplainmanagement requirements will be based upon current data. (m).Uponoccurrence,notifytheFederalInsuranceAdministrator(FIA)inwriting whenevertheboundariesofthecommunityhavebeenmodifiedbyannexationor thecommunityhasotherwiseassumedornolongerhasauthoritytoadoptand enforcefloodplainmanagementregulationsforaparticulararea.Inorderthatall FHBM'sandFIRM'saccuratelyrepresentthecommunity'sboundaries,include withinsuchnotificationacopyofamapofthecommunitysuitablefor reproduction,clearlydelineatingthenewcorporatelimitsornewareaforwhich thecommunityhasassumedorrelinquishedfloodplainmanagementregulatory authority (D)Floodplain Development Application, Permit, and Certification Requirements 1.ApplicationRequirements:.ApplicationforaFloodplainDevelopmentPermitshall bemadetotheFloodplainAdministratorpriortoanydevelopmentactivitieslocated withinSpecialFloodHazardAreas.Thefollowingitemsshallbepresentedtothe Floodplain Administrator to apply for a floodplain development permit: (a).Aplotplandrawntoscalewhichshallinclude,butshallnotbelimitedto,the following specific details of the proposed floodplain development: 1.thenature,location,dimensions,andelevationsoftheareaof development/disturbance;existingandproposedstructures,utilitysystems, grading/pavementareas,fillmaterials,storageareas,drainagefacilities,and other development; 2.theboundaryoftheSpecialFloodHazardAreaasdelineatedontheFIRM orotherfloodmapasdeterminedin7-10-3(B),orastatementthattheentire lot is within the Special Flood Hazard Area; 3.thefloodzone(s)designationoftheproposeddevelopmentareaas determinedontheFIRMorotherfloodmapasdeterminedinArticleIII, Section B; 4. the boundary of the floodway(s) as determined in Article III, Section B; 5. the Base Flood Elevation (BFE) where provided as set forth in7-10-3(B) 6.theoldandnewlocationofanywatercoursethatwillbealteredorrelocated as a result of proposed development; and (b).Proposedelevation,andmethodthereof,ofalldevelopmentwithinaSpecial Flood Hazard Area including but not limited to: 1.Elevationinrelationtomeansealeveloftheproposedlowestfloor (including basement) of all structures; 2.Elevationinrelationtomeansealeveltowhichanynon-residential structure in Zone A, AE, AH, or AO will be floodproofed; and 3.Elevationinrelationtomeansealeveltowhichanyproposedutility equipment and machinery will be elevated or floodproofed. (c).Iffloodproofing,aFloodproofingCertificate(FEMAForm086-0-33)with supportingdata,anoperationalplan,andaninspectionandmaintenanceplanthat include,butarenotlimitedto,installation,exercise,andmaintenanceofflood proofing measures will be required prior to Certificate of Occupancy/Completion. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (d).AFoundationPlan,drawntoscale,whichshallincludedetailsoftheproposed foundationsystemtoensureallprovisionsofthisordinancearemet.Thesedetails include but are not limited to: 1.Theproposedmethodofelevation,ifapplicable(i.e.,fill,solidfoundation perimeterwall,solidbackfilledfoundation,openfoundation,oron columns/posts/piers/piles/shear walls); and 2.Openingstofacilitateautomaticequalizationofhydrostaticfloodforceson wallsinaccordancewithArticleV,SectionA.8.b.whensolidfoundation perimeter walls are used in Zones A, AE, AH, and AO. (e). Usage details of any enclosed areas below the lowest floor. (f).Plansand/ordetailsfortheprotectionofpublicutilitiesandfacilitiessuchas sewer,gas,electrical,andwatersystemstobelocatedandconstructedtominimize flood damage. (g).CertificationthatallotherLocal,State,andFederalpermitsrequiredpriorto floodplain development permit issuance have been received. (h).Documentationforplacementofrecreationalvehiclesand/ortemporary structures,whenapplicable,toensurethattheprovisionsof7-10-5(B)5&6.ofthis ordinance are met. (i).Adescriptionofproposedwatercoursealterationorrelocation,when applicable,includinganengineeringreportontheeffectsoftheproposedproject ontheflood-carryingcapacityofthewatercourseandtheeffectstoproperties located both upstream and downstream; and 1.Amap(ifnotshownonplotplan)showingthelocationoftheproposed watercourse alteration or relocation. 2.PermitRequirements:TheFloodplainDevelopmentPermitshallinclude,butnotbe limited to: (a).Acompletedescriptionofallthedevelopmenttobepermittedunderthe floodplaindevelopmentpermit(i.e.house,garage,pool,septic,bulkhead,cabana, polebarn,chickencoop,pier,bridge,mining,dredging,filling,rip-rap,docks, grading,paving,excavationordrillingoperations,orstorageofequipmentor materials, etcetera). (b).TheSpecialFloodHazardAreadeterminationfortheproposeddevelopment in accordance with available data specified in 7-10-3(B). (c).TheFloodProtectionElevationrequiredforthelowestfloorandallattendant utilities. (d).TheFloodProtectionElevationrequiredfortheprotectionofallutility equipment and machinery. (e). All certification submittal requirements with timelines. (f).Astatementthatnofillmaterialorotherdevelopmentshallencroachintothe floodway of any watercourse, as applicable. (g). The flood openings requirements, if in Zones A, AE, AH, or AO. (h).Allfloodplaindevelopmentpermitsshallbeconditionaluponthestartof constructionofworkwithin180days.Afloodplaindevelopmentpermitshall expire180daysafterissuanceunlessthepermittedactivityhascommencedasper the Start of Construction definition. (i).Fullyenclosedareasbelowthelowestfloorareusablesolelyforparkingof vehicles, building access, or storage. (j). All materials below BFE/FPE must be flood resistant materials. 3. Certification Requirements: (a).Elevation Certificates 1.AConstructionDrawingsElevationCertificate(FEMAForm86-0-33)is requiredpriortotheactualstartofanynewconstruction.Itshallbetheduty ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 ofthepermitholdertosubmittotheFloodplainAdministratoracertification oftheelevationofthelowestfloor,inrelationtomeansealevel.The FloodplainAdministratorshallreviewthecertificatedatasubmitted. Deficienciesdetectedbysuchreviewshallbecorrectedbythepermitholder priortothebeginningofconstruction.Failuretosubmitthecertificationor failuretomakerequiredcorrectionsshallbecausetodenyafloodplain development permit. 2.ABuildingUnderConstructionElevationCertificate(FEMAForm 86-0-33)isrequiredafterthelowestfloorisestablished.Withinseven(7) calendardaysofestablishmentofthelowestfloorelevation,itshallbethe dutyofthepermitholdertosubmittotheFloodplainAdministratora certificationoftheelevationofthelowestfloor,inrelationtomeansealevel. Anyworkdonewithintheseven(7)daycalendarperiodandpriorto submissionofthecertificationshallbeatthepermitholder’srisk.The FloodplainAdministratorshallreviewthecertificatedatasubmitted. Deficienciesdetectedbysuchreviewshallbecorrectedbythepermitholder immediatelyandpriortofurtherworkbeingpermittedtoproceed.Failureto submitthecertificationorfailuretomakerequiredcorrectionsshallbecause to issue a stop-work order for the project. 3.Afinalas-builtFinishedConstructionElevationCertificate(FEMAForm 86-0-33)isrequiredafterconstructioniscompletedandpriortoCertificateof Compliance/Occupancyissuance.Itshallbethedutyofthepermitholderto submittotheFloodplainAdministratoracertificationoffinalas-built constructionoftheelevationofthelowestfloorandallattendantutilities. TheFloodplainAdministratorshallreviewthecertificatedatasubmitted. Deficienciesdetectedbysuchreviewshallbecorrectedbythepermitholder immediatelyandpriortoCertificateofCompliance/Occupancyissuance.In someinstances,anothercertificationmayberequiredtocertifycorrected as-builtconstruction.Failuretosubmitthecertificationorfailuretomake requiredcorrectionsshallbecausetowithholdtheissuanceofaCertificateof Compliance/Occupancy. (b).FloodproofingCertificate.Ifnon-residentialfloodproofingisusedtomeetthe FloodProtectionElevationrequirements,designplans,withsupportingdata,an operationalplan,andaninspectionandmaintenanceplanarerequiredpriortothe actualstartofanynewconstruction.Itshallbethedutyofthepermitholderto submittotheFloodplainAdministratoracertificationofthefloodproofeddesign elevationofthelowestfloorandallattendantutilities,inrelationtomeansea level.Floodproofingcertificationshallbepreparedbyorunderthedirect supervisionofaprofessionalengineerorarchitectandcertifiedbysame.The FloodplainAdministratorshallreviewthecertificatedata,theoperationalplan,and theinspectionandmaintenanceplan.Deficienciesdetectedbysuchreviewshall becorrectedbytheapplicantpriortopermitapproval.Failuretosubmitthe certificationorfailuretomakerequiredcorrectionsshallbecausetodenya FloodplainDevelopmentPermit.PriortorequestforaCertificateof Compliance/OccupancyaFloodproofingCertificate(FEMAForm086-0-34)shall be provided to the Floodplain Administrator for review and approval. (c).IfamanufacturedhomeisplacedwithinZoneA,AE,AH,orAOandthe elevationofthechassisismorethan36inchesinheightabovegrade,an engineeredfoundationcertificationisrequiredinaccordancewiththeprovisionsof 7-10-5 (B)3(b). (d).Ifawatercourseistobealteredorrelocated,thefollowingshallallbe submittedbythepermitapplicantpriortoissuanceofafloodplaindevelopment permit: 1. a description of the extent of watercourse alteration or relocation; and ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 2.aprofessionalengineer’scertifiedreportontheeffectsoftheproposed projectontheflood-carryingcapacityofthewatercourseandtheeffectsto properties located both upstream and downstream; and 3.amapshowingthelocationoftheproposedwatercoursealterationor relocation; and 4.anIdahoStreamChannelAlterationPermitapprovalshallbeprovidedby the applicant to the Floodplain Administrator. (e).CertificationExemptions.Thefollowingstructuresareexemptfromthe elevation/floodproofingcertificationrequirementsspecifiedinitemsa.andb.of this subsection: 1. Recreational Vehicles meeting requirements of 7-10-5 (B)5(a); 2. Temporary Structures meeting requirements of 7-10-5 (B)6; and 3.AccessoryStructureslessthan200squarefeetmeetingrequirementsof 7-10-5 (B)7. (E)DeterminationsforExistingBuildingsandStructures.Forapplicationsforbuilding permitstoimprovebuildingsandstructures,includingalterations,movement,enlargement, replacement,repair,changeofoccupancy,additions,rehabilitations,renovations, improvements,repairsofdamage,andanyotherimprovementoforworkonsuchbuildings andstructures,theFloodplainAdministrator,incoordinationwiththeBuildingOfficial, shall: 1.Estimatethemarketvalue,orrequiretheapplicanttoobtainanappraisalofthe marketvaluepreparedbyaqualifiedindependentappraiser,ofthebuildingor structurebeforethestartofconstructionoftheproposedwork.Inthecaseofrepair, themarketvalueofthebuildingorstructureshallbethemarketvaluebeforethe damage occurred and before any repairs are made; 2.Comparethecosttoperformtheimprovement,thecosttorepairadamaged buildingtoitspre-damagedcondition,orthecombinedcostsofimprovementsand repairs, if applicable, to the market value of the building or structure; 3.Determineanddocumentwhethertheproposedworkconstitutessubstantial improvement or repair of substantial damage; and 4.Notifytheapplicantifitisdeterminedthattheworkconstitutessubstantial improvementorrepairofsubstantialdamageandthatcompliancewiththeflood resistantconstructionrequirementsoftheadoptedIdahoBuildingCodeandthis ordinance is required. (F). Corrective Procedures 1.ViolationstobeCorrected:WhentheFloodplainAdministratorfindsviolationsof applicableStateandlocallaws,itshallbehisorherdutytonotifytheowneror occupantofthebuildingoftheviolation.Theowneroroccupantshallimmediately remedy each of the violations of law cited in such notification. 2.ActionsinEventofFailuretoTakeCorrectiveAction:Iftheownerofabuildingor propertyshallfailtotakepromptcorrectiveaction,theFloodplainAdministratorshall givetheownerwrittennotice,bycertifiedorregisteredmailtotheowner’slastknown address or by personal service, stating: (a).thatthebuildingorpropertyisinviolationofthefloodplainmanagement regulations; (b).thatahearingwillbeheldbeforetheFloodplainAdministratoratadesignated placeandtime,notlaterthanten(10)daysafterthedateofthenotice,atwhich timetheownershallbeentitledtobeheardinpersonorbycounselandtopresent arguments and evidence pertaining to the matter; and (c).thatfollowingthehearing,theFloodplainAdministratormayissueanorderto alter, vacate, or demolish the building; or to remove fill as applicable. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 3.OrdertoTakeCorrectiveAction.If,uponahearingheldpursuanttothenotice prescribedabove,theFloodplainAdministratorshallfindthatthebuildingor developmentisinviolationoftheFloodDamagePreventionOrdinance,heorshe shallissueanorderinwritingtotheowner,requiringtheownertoremedythe violationwithinaspecifiedtimeperiod,notlessthansixty(60)calendardays,nor morethan180calendardays.WheretheFloodplainAdministratorfindsthatthereis imminentdangertolifeorotherproperty,heorshemayorderthatcorrectiveactionbe taken in such lesser period as may be feasible. (a).Appeal:Anyownerwhohasreceivedanordertotakecorrectiveactionmay appealtheordertothelocalelectedgoverningbodybygivingnoticeofappealin writingtotheFloodplainAdministratorandtheclerkwithinten(10)days followingissuanceofthefinalorder.Intheabsenceofanappeal,theorderofthe FloodplainAdministratorshallbefinal.Thelocalgoverningbodyshallhearan appealwithinareasonabletimeandmayaffirm,modifyandaffirm,orrevokethe order. (b).FailuretoComplywithOrder:Iftheownerofabuildingorpropertyfailsto complywithanordertotakecorrectiveactionforwhichnoappealhasbeenmade orfailstocomplywithanorderofthegoverningbodyfollowinganappeal,the ownershallbeguiltyofamisdemeanorandshallbepunishedatthediscretionof the court. 4. Variance Procedure: (a). Appeal Board: (1) The Board of Adjustment or the City Council acting as the Board of Adjustment, as established by the City of Ammon, shall hear and decide appeals and requests for variances from the requirements of this chapter. (2) The Board of Adjustment, or the City Council acting as the Board of Adjustment, shall hear and decide appeals when it is alleged there is an error in any requirement, decision, or determination made by the Enforcement Officer in the enforcement or administration of this chapter. (3) Those aggrieved by the decision of the Board of Adjustment, or the City Council acting as the Board of Adjustment, or any taxpayer, may appeal such decision to the Seventh Judicial District Court, as provided by Idaho statutes. (4) In passing upon such applications, the Board of Adjustment, or the City Council acting as the Board of Adjustment, shall consider all technical evaluations, all relevant factors, standards specified in other sections of this chapter, and: (a) The danger that materials may be swept onto other lands to the injury of others; (b) The danger to life and property due to flooding or erosion damage; (c) The susceptibility of the proposed facility and its contents to flood damage and the effect of such damage on the individual owner; (d) The importance of the services provided by the proposed facility to the community; (e) The necessity to the facility of a waterfront location, where applicable; (f) The availability of alternative locations for the proposed use which are not subject to flooding or erosion damage; (g) The compatibility of the proposed use with existing and anticipated development; ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (h) The relationship of the proposed use to the comprehensive plan and floodplain management program for that area; (i) The safety of access to the property in times of flood for ordinary and emergency vehicles; (j) The expected heights, velocity, duration, rate of rise, and sediment transport of the flood waters and the effects of wave action, if applicable, expected at the site; and (k) The costs of providing governmental services during and after flood conditions, including maintenance and repair of public utilities and facilities such as sewer, gas, electrical, and water systems, and streets and bridges. (5) Upon consideration of the factors of Section 7-10-4 (D) 1(d) and the purposes of this chapter, the Board of Adjustment, or the City Council acting as the Board of Adjustment, may attach such conditions to the granting of variances as it deems necessary to further the purposes of this chapter. (6) The City Engineer shall maintain the records of all appeal actions and report any variances to the Federal Insurance Administration upon request. (b). Conditions for Variance: (1) Generally, the only condition under which a variance from the elevation standard may be issued is for new construction and substantial improvements to be erected on a lot of one-half (½) acre or less in size contiguous to and surrounded by lots with existing structures constructed below the base flood level, providing items (i-xi) in Section 7-10-4 (D) 1(d) have been fully considered. As the lot size increases the technical justification required for issuing the variance increases. (2) Variances may be issued for the reconstruction, rehabilitation, or restoration of structures listed on the National Register of Historic Places or the State Inventory of Historic Places, without regard to the procedures set forth in this section. (3) Variances shall not be issued within a designated floodway if any increase in flood levels during the base flood discharge would result. (4) Variances shall only be issued upon a determination that the variance is the minimum necessary, considering the flood hazard, to afford relief. (5)functionallydependentfacilities,ifdeterminedtomeetthe definitionasstatedinArticleIIofthisordinance,providedprovisions of7-10-4(E)2,havebeensatisfied,andsuchfacilitiesareprotectedby methodsthatminimizeflooddamagesduringthebasefloodandcreate no additional threats to public safety; or (6)anyothertypeofdevelopment,provideditmeetstherequirements of this Section. (7) Variances shall only be issued upon: (a) A showing of good and sufficient cause; (b) A determination that failure to grant the variance would result in exceptional hardship to the applicant; (c) A determination that the granting of a variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, create nuisances, cause fraud on or victimization of the public, or conflict with existing local laws or ordinances. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (8) Variances as interpreted in the National Flood Insurance Program are based on the general zoning law principle that they pertain to a physical piece of property; they are not personal in nature and do not pertain to the structure, its inhabitants, economic or financial circumstances. They primarily address small lots in densely populated residential neighborhoods. As such, variances from the flood elevations should be quite rare. (7) Variances may be issued for nonresidential buildings in very limited circumstances to allow a lesser degree of floodproofing than watertight or dry-floodproofing, where it can be determined that such action will have low damage potential, complies with all other variance criteria except Section 7-10-4 (D) 2(a), and otherwise complies with Sections 7-10-5 (A) 1 and 7-10-5 (A) 2 of the GENERAL STANDARDS. (8) Any applicant to whom a variance is granted shall be given written notice that the structure will be permitted to be built with a lowest floor elevation below the base flood elevation and that the cost of flood insurance will be commensurate with the increased risk resulting from the reduced lowest floor elevation. 7-10-5: PROVISIONS FOR FLOOD HAZARD PROTECTION: (A) General Standards: In all areas of special flood hazards, the following standards are required: 1. Anchoring: (a) All new construction and substantial improvements shall be anchored to prevent flotation, collapse, or lateral movement of the structure. (b) All manufactured homes must likewise be anchored to prevent flotation, collapse, or lateral movement, and shall be installed using methods and practices that minimize flood damage. Anchoring methods may include, but are not limited to, use of over-the-top or frame ties to ground anchors. (Reference FEMA’s “Manufactured Home Installation in Flood Hazard Areas” guidebook for additional techniques.) 2. Construction Materials and Methods: (a) All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage in accordance with the Technical Bulletin 2, Flood Damage-Resistant Materials Requirements, and available from the Federal Emergency Management Agency. (b) All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage. (c) Electrical, heating, ventilation, plumbing, and air-conditioning equipment and other service facilities shall be designed and/or otherwise elevated or located so as to prevent water from entering or accumulating within the components during conditions of flooding to the Flood Protection Elevation. These include, but are not limited to, HVAC equipment, water softener units, bath/kitchen fixtures, ductwork, electric/gas meter panels/boxes, utility/cable boxes, hot water heaters, and electric outlets/switches. 3. Utilities: (a) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system; ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (b) New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters; and (c) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding. 4. Subdivision Proposals: (a) All subdivision proposals shall be required to mitigate and remove from the flood plain prior to any building permits being issued on lots within the boundaries of the floodplain as they now exist. (b) All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical, and water systems located and constructed to minimize flood damage; (c) All subdivision proposals shall have adequate drainage provided to reduce exposure to flood damage; and (d) Base flood elevation data shall be provided for subdivision proposals and other proposed development which contain at least fifty (50) lots or five (5) acres, whichever is less. (e) All subdivision proposals and other development proposals shall have received all necessary permits from those governmental agencies for which approval is required by Federal or State law, including Section 404 of the Federal Water Pollution Control Act Amendments of 1972, 33 USC 1334 5. Review of Building Permits: Where elevation data is not available either through the Flood Insurance Study or from another authoritative source (Section 7-10-4(C)2), applications for building permits shall be reviewed to assure that proposed construction will be reasonably safe from flooding. The test of reasonableness is a local judgment and includes use of historical data, high water marks, photographs of past flooding, etc., where available. Failure to elevate at least two feet above grade in these zones may result in higher insurance rates. 6.Nothing in this ordinance shall prevent the repair, reconstruction, or replacement of a building or structure existing on the effective date of this ordinance and located totally or partially within the floodway, or stream setback, provided there is no additional encroachment below the Flood Protection Elevation in the floodway, or stream setback, and provided that such repair, reconstruction, or replacement meets all of the other requirements of this ordinance. (B) Specific Standards: In all areas of special flood hazards where base flood elevation data has been provided as set forth in Section 7-10-3(B), Basis for Establishing the Area of Special Flood Hazard or Section 7-10-4(C)2, use of Other Base Flood Data, the following provisions are required: 1. Residential Construction: (a) New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 above base flood elevation, or comply with flood proof basement requirements as set forth in Section 7-10-6 of this chapter. (b) Fully enclosed areas below the lowest floor that are subject to flooding are prohibited, or shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or must meet or exceed the following minimum criteria: (1) A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed are subject to flooding shall be provided; (2) The bottom of all openings shall be no higher than one foot above grade; (3) Openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters. (4)Ifabuildinghasmorethanoneenclosedarea,eachenclosedareamust have flood openings to allow floodwaters to automatically enter and exit; (5)Enclosuresmadeofflexibleskirtingarenotconsideredenclosuresfor regulatorypurposes,and,therefore,donotrequirefloodopenings.Masonry orfloodresistantwoodunderpinning,regardlessofstructuralstatus,is considered an enclosure and requires flood openings as outlined above. 2. Nonresidential Construction: New construction and substantial improvement of any commercial, industrial, or other nonresidential structure shall either have the lowest floor, including basement, elevated to the level of the base flood elevation; or, together with attendant utility and sanitary facilities, shall: (a) Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water; (b) Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; (c) Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting provisions of this subsection based on their development and or review of the structural design, specifications, and plans. Such certifications shall be provided to the officials as set forth in Section 7-10-4(C)3(b); and (d) Nonresidential structures that are elevated, not floodproofed, must meet the same standards for space below the lowest floor as described in Section 7-10-5 (B) 1(2). (e) Manufactured Homes: All manufactured homes to be placed or substantially improved within Zones A1-30, AH, and AE shall be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation and be securely anchored to an adequately anchored foundation system in accordance with the provisions of Section 7-10-5 (A) 1(b). ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 (f)Newsolidwastedisposalfacilitiesandsites,hazardouswastemanagement facilities,salvageyards,andchemicalstoragefacilitiesshallnotbepermitted, exceptbyvarianceasspecifiedinArticleIV,SectionE.9.Astructureortank forchemicalorfuelstorageincidentaltoanalloweduseortotheoperationofa watertreatmentplantorwastewatertreatmentfacilitymaybelocatedina SpecialFloodHazardAreaonlyifthestructureortankiseitherelevatedor floodproofedtoatleasttheFloodProtectionElevationandcertifiedin accordance with the provisions of 7-10-4 (C) 3. 3. Basements: (a)Bedesignedandbuiltsothatanybasementarea,togetherwithattendant utilitiesandsanitaryfacilitiesbelowthefloodproofeddesignlevel,iswatertight withwallsthatareimpermeabletothepassageofwaterwithouthuman intervention.Basementwallsshallbebuiltwiththecapacitytoresisthydrostatic andhydrodynamicloadsandtheeffectsofbuoyancyresultingfromfloodingto thefloodproofeddesignlevel,andshallbedesignedsothatminimaldamage willoccurfromfloodsthatexceedthatlevel.Thefloodproofeddesignlevel shallbeanelevationonefootabovethelevelofthebasefloodwherethe differencebetweenthebasefloodandthe500-yearfloodisthreefeetorless andtwofeetabovethelevelofthebasefloodwherethedifferenceisgreater than three feet. (b)Havethetopofthefloorofanybasementareanolowerthanfivefeetbelow the elevation of the base flood; (c)Havetheareasurroundingthestructureonallsidesfilledtoorabovethe elevationofthebaseflood.Fillmustbecompactedwithslopesprotectedby vegetative cover; (d)Havearegisteredprofessionalengineerorarchitectdeveloporreviewthe building'sstructuraldesign,specifications,andplans,includingconsiderationof thedepth,velocity,anddurationoffloodingandtypeandpermeabilityofsoils atthebuildingsite,andcertifythatthebasementdesignandmethodsof constructionproposedareinaccordancewithacceptedstandardsofpracticefor meeting the provisions of this paragraph; (e)Beinspectedbythebuildinginspectororotherauthorizedrepresentativeof thecommunitytoverifythatthestructureisbuiltaccordingtoitsdesignand those provisions of this section which are verifiable. 4. Additions/Improvements: a.Additionsand/orimprovementstopre-FIRMstructureswhentheaddition and/orimprovementsincombinationwithanyinteriormodificationstothe existing structure are 1.notasubstantialimprovement,theadditionand/orimprovementsmustbe designedtominimizeflooddamagesandmustnotbeanymore non-conforming than the existing structure; or 2.asubstantialimprovement,boththeexistingstructureandtheaddition and/or improvements must comply with the standards for new construction. b.Additionstonon-compliantpost-FIRMstructuresthatareasubstantial improvementwithnomodificationstotheexistingstructureotherthana standarddoorinthecommonwallshallrequireonlytheadditiontocomplywith the standards for new construction. c.Additionsand/orimprovementstonon-compliantpost-FIRMstructureswhen theadditionand/orimprovementsincombinationwithanyinterior modifications to the existing structure are 1.notasubstantialimprovement,theadditionand/orimprovementsonly must comply with the standards for new construction; or ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 2.asubstantialimprovement,boththeexistingstructureandtheaddition and/or improvements must comply with the standards for new construction. d.Anycombinationofrepair,reconstruction,rehabilitation,addition,or improvementofabuildingorstructuretakingplaceduringa10yearperiod,the cumulativecostofwhichequalsorexceeds50percent(50%)ofthemarket valueofthestructurebeforetheimprovementorrepairisstarted,mustcomply withthestandardsfornewconstruction.Foreachbuildingorstructure,the10 yearperiodbeginsonthedateofthefirstimprovementorrepairofthatbuilding orstructuresubsequenttotheeffectivedateofthisordinance.Ifthestructure hassustainedsubstantialdamage,anyrepairsareconsideredsubstantial improvementregardlessoftheactualrepairworkperformed.Therequirement does not, however, include either: 1.anyprojectforimprovementofabuildingrequiredtocorrectexisting health,sanitary,orsafetycodeviolationsidentifiedbythebuildingofficial and that are the minimum necessary to assume safe living conditions; or 2.anyalterationofahistoricstructureprovidedthatthealterationwillnot preclude the structure’s continued designation as a historic structure. 5. Recreational Vehicles. Recreational vehicles shall be either: a.Temporary Placement 1.beonsiteforfewerthan180consecutivedaysandbefullylicensedand readyforhighwayuse(arecreationalvehicleisreadyforhighwayuseifitis onitswheelsorjackingsystem,isattachedtothesiteonlybyquick disconnect type utilities, and has no permanently attached additions); or b.Permanent Placement. 1.Recreationalvehiclesthatdonotmeetthelimitationsof TemporaryPlacementshallmeetalltherequirementsfornew construction, as set forth in 7-10-5 (A). 6. Temporary Non-Residential Structures: Priortotheissuanceofafloodplaindevelopmentpermitforatemporarystructure, theapplicantmustsubmittotheFloodplainAdministratoraplanfortheremovalof suchstructure(s)intheeventofaflashfloodorothertypeoffloodwarning notification.Thefollowinginformationshallbesubmittedinwritingtothe Floodplain Administrator for review and written approval: a.aspecifiedtimeperiodforwhichthetemporaryusewillbepermitted.Time specified may not exceed six (6) months, renewable up to one (1) year; b.thename,address,andphonenumberoftheindividualresponsibleforthe removal of the temporary structure; c.thetimeframepriortotheeventatwhichastructurewillberemoved(i.e., immediately upon flood warning notification); d.acopyofthecontractorothersuitableinstrumentwiththeentityresponsible for physical removal of the structure; and e.designation,accompaniedbydocumentation,ofalocationoutsidethe Special Flood Hazard Area, to which the temporary structure will be moved. f.TemporarystructuresinthefloodwaymustprovideaHydraulicand Hydrology Analysis along with a No-Rise Certification. 7. Accessory and Agricultural Structures (Appurtenant structures): Whenaccessorystructures(sheds,detachedgarages,etc.)usedsolelyforparking, andstoragearetobeplacedwithinaSpecialFloodHazardArea,elevationor floodproofingcertificationsarerequiredforallaccessorystructuresinaccordance with 7-10-4 (D) 3, and the following criteria shall be met: a.Accessorystructuresshallnotbeusedforhumanhabitation(including working, sleeping, living, cooking, or restroom areas); b.Accessory structures shall not be temperature-controlled; c.Accessory structures shall be designed to have low flood damage potential; ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 d.Accessorystructuresshallbeconstructedandplacedonthebuildingsiteso as to offer the minimum resistance to the flow of floodwaters; e.Accessorystructuresshallbefirmlyanchoredinaccordancewiththe provisions of 7-10-5 (A)1; f.Allutilityequipmentandmachinery,suchaselectrical,shallbeinstalledin accordance with the provisions of 7-10-5 (A)2(c); and g.Floodopeningstofacilitateautomaticequalizationofhydrostaticflood forcesshallbeprovidedbelowFloodProtectionElevationinconformancewith the provisions of 7-10-5(B)1(b). h. Accessorystructuresnotusedsolelyforparking,access,andstoragemustbe elevated per 7-10-5 (B)1 and 7-10-5 (B)2. Anaccessorystructurewithafootprintlessthan200squarefeetandisa minimalinvestmentof$7,500andsatisfiesthecriteriaoutlinedi na-gaboveis not required to provide the elevation certificate per 7-10-5 (B)2. 8. Tanks: WhengasandliquidstoragetanksaretobeplacedwithinaSpecialFloodHazard Area, the following criteria shall be met: a.Undergroundtanksinfloodhazardareasshallbeanchoredtoprevent flotation,collapse,orlateralmovementresultingfromhydrodynamicand hydrostaticloadsduringconditionsofthebaseflood,includingtheeffectsof buoyancy (assuming the tank is empty); b.Elevatedabove-groundtanks,infloodhazardareasshallbeattachedtoand elevatedtoorabovethedesignfloodelevationonasupportingstructurethatis designedtopreventflotation,collapse,orlateralmovementduringconditionsof thebaseflood.Tank-supportingstructuresshallmeetthefoundation requirements of the applicable flood hazard area; c.Notelevatedabove-groundtanksmaybepermittedinfloodhazardareas providedthetanksareanchoredorotherwisedesignedandconstructedto preventflotation,collapseorlateralmovementresultingfromhydrodynamic andhydrostaticloadsduringconditionsofthedesignflood,includingtheeffects of buoyancy assuming the tank is empty and the effects of flood-borne debris. d.Tank inlets, fill openings, outlets and vents shall be: 1.atorabovethefloodprotectionelevationorfittedwithcovers designedtopreventtheinflowoffloodwateroroutflowofthecontentsof the tanks during conditions of the base flood; and 2.anchoredtopreventlateralmovementresultingfromhydrodynamic andhydrostaticloads,includingtheeffectsofbuoyancy,duringconditions of the base flood. 9. Construction of Below-Grade Crawlspace: a.TheinteriorgradeofacrawlspacemustnotbebelowtheBFEandmustnot be more than two (2) feet below the exterior lowest adjacent grade (LAG). b.Theheightofthebelow-gradecrawlspace,measuredfromtheinteriorgrade ofthecrawlspacetothetopofthecrawlspacefoundationwall,mustnotexceed four (4) feet at any point. c.Theremustbeanadequatedrainagesystemthatremovesfloodwatersfrom theinteriorareaofthecrawlspace.Theenclosedareashouldbedrainedwithina reasonable time after a flood event. d.Thevelocityoffloodwatersatthesiteshouldnotexceedfive(5)feetper second for any crawlspace. 10. Critical Facilities: Constructionofnewcriticalfacilitiesshallbe,totheextentpossible,locatedoutside thelimitsofthespecialfloodhazardarea(SFHA)(100-yearfloodplain).Construction ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 ofnewcriticalfacilitiesshallbepermissiblewithintheSFHAifnofeasiblealternative siteisavailable.CriticalfacilitiesconstructedwithintheSFHAshallhavethelowest floorelevatedthreefeet(3')aboveBFEortotheheightofthe500-yearflood, whicheverishigher.Accesstoandfromthecriticalfacilityshouldalsobeprotectedto theheightutilizedabove.Floodproofingandsealingmeasuresmustbetakentoensure thattoxicsubstanceswillnotbedisplacedbyorreleasedintofloodwaters.Access routeselevatedtoorabovethelevelofthebasefloodelevationshallbeprovidedtoall critical facilities to the extent possible. (C) Floodways: Located within areas of special flood hazard establishments in Section 7-10-3 (B) are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply: 1. Prohibit encroachments, including fill, new construction, substantial improvement, and other development unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge. 2. If Section 7-10-5(C)-1 is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Section 7-10-5, PROVISIONS FOR FLOOD HAZARD REDUCTION. 3. Prohibit the placement of any mobile homes, except in an existing mobile home park or existing mobile home subdivision. (D)Standards for Floodplains without Established Base Flood Elevations WithintheSpecialFloodHazardAreasdesignatedasZoneA(alsoknownas UnnumberedAZones)andestablishedin7-10-3(B),wherenoBaseFloodElevation (BFE)datahasbeenprovidedbyFEMA,thefollowingprovisions,inadditiontothe provisions of 7-10-5 (A), shall apply: TheBFEusedindeterminingtheFloodProtectionElevation(FPE)shallbedetermined based on the following criteria: 1.WhenBaseFloodElevation(BFE)dataisavailablefromothersources,all newconstructionandsubstantialimprovementswithinsuchareasshallalso complywithallapplicableprovisionsofthisordinanceandshallbeelevatedor floodproofed in accordance with standards in 7-10-5 (A) and 7-10-5 (B). 2.WhenfloodwaydataisavailablefromaFederal,State,orothersource,all newconstructionandsubstantialimprovementswithinfloodwayareasshallalso comply with the requirements of 7-10-5 (B). 3.Requirethatallnewsubdivisionproposalsandotherproposeddevelopments (includingproposalsformanufacturedhomeparksandsubdivisions)greaterthan 50lotsor5acres,whicheveristhelesser,includewithinsuchproposalsbaseflood elevationdata.SuchBaseFloodElevation(BFE)datashallbeadoptedby referenceinaccordancewithArticleIII,SectionBandutilizedinimplementing this ordinance. See FEMA 480 and/or FEMA 265 for further information 4. When Base Flood Elevation (BFE) data is not available from a Federal, State, or other source as outlined above, the lowest floor shall be elevated or floodproofed (non-residential) to two feet (2.0 ft.) above the Highest Adjacent Grade (HAG) at the building site or to the Flood Protection Elevation (FPE) whichever is higher, as defined in 7-10-2. All other applicable provisions of Article V, Section B shall also apply. (E) Standards for Shallow Flooding Areas (AO Zones): ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 1. Shallow flooding areas appear in FIRM’s as AO zones with depth designations. The base flood depths in these zones range from one (1) to three (3) feet where a clearly defined channel does not exist, or where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is usually characterized as sheet flow. In these areas, the following provisions apply: (a) New construction and substantial improvements of residential structures within AO zones shall have the lowest floor (including basement) elevated above the adjacent grade of the building site, to or above the depth number specified on the FIRM (at least two (2) feet if no depth number is specified). (b) New construction and substantial improvements of nonresidential structures within AP zones shall either: (1) The lowest floor (including basement) elevated above the adjacent grade of the building site, to or above the depth number specified on the FIRM (at least two (2) feet if no depth number is specified); or (2) Together with attendant utility and sanitary facilities, be completely floodproofed to or above that level so that any space below that level is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. If this method is used, compliance shall be certified by a registered professional engineer or architect as in Section 7-10-5 (B) 2(c). (c) Require adequate drainage paths around structures on slopes to guide floodwaters around and away from proposed structures. (d) Shall have flood openings to facilitate automatic equalization of hydrostatic flood forces shall be provided below Flood Protection Elevation 7-10-6: REPEALED 7-10-7: ACCESSORY STRUCTURES: (A) Accessory structures to a main structure shall be defined as those structures which are utilized in connection with a main structure, but in and of the accessory structure itself does not constitute a main purpose of function of the improvement. Such accessory buildings shall include, but not by way of limitation, storage sheds, tool sheds, garden buildings, greenhouses, detached garages, kennels, and barns. (B) No such accessory structure shall at any time be used for human habitation. (C) All such accessory structures shall be designed to have low flood damage potential. (D)Allsuchaccessorystructuresshallbeconstructedandplaceonthebuildingsitesoas to offer the minimum resistance to the flow of flood waters. (E) All such accessory structures shall be firmly anchored to prevent flotation which may result in damage to other structures. (F) All service facilities to any such accessory structure such as electrical and heating ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 equipment shall be elevated or floodproofed. (G) When an accessory structure represents a minimal investment, the elevation or dry floodproofing standards need not be met. However, all other requirements applicable to structures will be applicable. A minimal investment shall be determined by the applicable building authority, or by the appeal under the variance procedure and shall be determined, if necessary, on a case to case basis. However, as a general application, expenditure for the accessory structure of not more than ten percent (10%) of the value of the main structure shall be considered a minimal investment. 7-10-8:FLOODINSURANCESTUDY:ThefloodinsurancestudyfortheCityofAmmon,dated April2,2002,andanyrevisionsthereto,isherebyadoptedbyreferenceanddeclaredtobeapartof theordinanceoftheCityofAmmon,forthecontrolanduseofpropertyintheCityofAmmon, Idaho flood plain. ThemostcurrentfloodinsurancestudyforBonnevilleCountyshallbeusedforanyproperties annexedintotheCityofAmmonthatareoutsideoftheCityofAmmonfloodinsurancestudy maps. 7-10-9:ELEVATIONCERTIFICATESREQUIREDFORALLNEWBUILDINGSINTHE CITY: Elevation Certificates for buildings in the floodplain shall be required at the following times: Elevation Certificates for buildings in the floodplain should be required as follows: (A)Submittedwithconstructiondrawingsatthetimeofarequestforabuildingpermit (prior to any alterations of the ground) and (B) After the foundation or pad has been poured. This certificate should provide the information showing the lowest floor is at or above the required elevation. The City Engineer shall certify this. (C)TheCityEngineerworkingwiththeBuildingDepartmentshallinspectandcertify thatanyadditionaldevicesorstructuresareinplacepriortothefinalcertificateof occupancy. ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 STATE OF IDAHO) ) ss. County of Bonneville) I, KRISTINA BUCHAN, CITY CLERK OF THE CITY OF AMMON, IDAHO DO HEREBY CERTIFY; That the above and foregoing is a full, true and correct copy of the Ordinance entitled, ORDINANCE 657 ANORDINANCEOFTHECITYOFAMMON,OFTHESTATEOFIDAHO, REPEALINGANDREPLACINGTITLE7,CHAPTER10,FLOODPLAIN REQUIREMENTS,TOALIGNAMMONMUNICIPALCODEWITH FEDERALFLOODPLAINDEVELOPMENTSTANDARDS;PROVIDINGA SEVERABILITYCLAUSE;PROVIDINGAREPEALERCLAUSE;AND PROVIDING AN EFFECTIVE DATE. DATED this 11 day of February 11, 2021. ________________________________ Kristina Buchan, City Clerk ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 SUMMARY OF ORDINANCE NO: #657 ANORDINANCEOFTHECITYOFAMMON,OFTHESTATEOFIDAHO, REPEALINGANDREPLACINGTITLE7,CHAPTER10,FLOODPLAIN REQUIREMENTS,TOALIGNAMMONMUNICIPALCODEWITH FEDERALFLOODPLAINDEVELOPMENTSTANDARDS;PROVIDINGA SEVERABILITYCLAUSE;PROVIDINGAREPEALERCLAUSE;AND PROVIDING AN EFFECTIVE DATE. The full text of this Corrected Ordinance No. 657, is available at the City Clerk’s Office, Ammon City Office, 2135 S Ammon Road, Ammon, Idaho. ATTEST:CITY OF AMMON ______________________________________________________________________ Kristina Buchan, City ClerkSean Coletti, Mayor I have reviewed the foregoing summary and believe that it provides a true and complete summary of Corrected Ordinance #657 and that the summary provides adequate notice to the public of the contents of this ordinance. DATED this 11 day of February, 2021. ________________________________ Scott Hall, City Attorney ORDINANCE 657 AND SUMMARY, UPDATE TO FLOODPLAIN REQUIREMENTS, FEBRUARY 2021 RIPTION