Stout Group Water Study, 2022-01-27, TM ADD1Stout Group Drinking Water Study
2 KA #221223
Table 1 - Estimated Drinking Water Demands
Parcel South of
Township Rd
Parcel North of
Township Rd
Estimated Household Demand (unchanged):
Max Day Demand (MDD), gpm 0.37
Peak Hour Demand (PHD), gpm 0.49
Fire Flow, gpm 1,500
Nodes 17 15
Original Revised Original Revised
Dwellings 800 495 400 221
MDD Per Node, gpm 17.4 10.8 9.9 5.5
PHD Per Node, gpm 23.1 14.3 13.1 7.2
Total MDD, gpm 296 183 148 82
Total PHD, gpm 392 243 196 108
*gpm = gallons per minute
This development represents a total additional water system demand of 265 gpm MDD (down
from 444 gpm in the original memo) and 351 gpm PHD (down from 588 gpm) between the two
parcels.
Well 10 was modeled as being offline in order to satisfy the Idaho Department of Environmental
Quality (DEQ) requirement that pressure be met with any pump offline. The Well 13 facility
currently under construction was shown online with two pumps installed.
3.0 RESULTS
These changes to demand had negligible impact to the performance of the system during both
MDD plus fire flow conditions and PHD. The model shows that this subdivision can be provided
with water such that state requirements for MDD and PHD pressures are met, so long as
previous distribution line size recommendations are followed, good interconnection is provided
through the subdivision’s distribution network, and dead-end lines are avoided.
The new proposed development represents 351 gpm or 15% of Well 13’s original 2,400 gpm
capacity; at full Well 13 facility buildout, this would be 7% of the total 4,800 gpm.