DDW-2024-012103

Koosharem Capacity.xlsx Page 1 of 10/15/2024
Division of Drinking Water — Water System Capacity Calculation Sheet (Last Update 3/30/2017)
*Enter the green cells only*
System Name Koosharem System Number 21010
1.1 Indoor Water Use
Number of residential connections - - - - - - - - - - -- - - - - - - - - - - - - - - - - - -- - - - - - - - -200
Number of other connections - - - 10 ERCs of other connections 73.0 (Example: water use of 2 factories
equals to water use of 55 homes.)
Total Equivalent Residential Connections (ERCs)273.0
MIN. REQUIREMENTS FOR INDOOR WATER USE
Source Storage
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
800 151.7)400 (109,200)
1.2 Outdoor Water Use
Is the drinking water used for outdoor irrigation?
Residential ERCs using drinking water for irrigation - - - - - - - - - - - - > > >9
Percentage of Residential ERCs using DW for irrigation - - - - - - - - - - - - > > >5%Map Zones
Average irrigated acreage per residential connection - - - - - - - - - - - - > > >0.05 1
Total irrigated acreage of other connections (park, school, etc.)- - - - - - - - - - - - > > >0.00 2
(Enter notes here regarding whether and what % of
irrigation water is supplied by PWS.)
Irrigation zone 3 3
4
5
MIN. REQUIREMENTS FOR IRRIGATION USE 6
Source Storage
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
244 1.5 126 1,138
1.3 Fire Flow Water Use
Does the water system provide fire protection?
Maximum fire flow demand (in gpm) for water system or pressure zone 1,000
Maximum fire suppression duration (in hours) for water system or pressure zone 1
Required Fire Suppression Storage (in gallons) - - - - - - - - - - - - - - - - - - - - > > >60,000
(*Verify req'd fire flow and duration with local fire code officials.* Enter notes here, e.g. fire
official contact info or comments.)
2. Summary of Water System Capacity Requirements
Koosharem Capacity.xlsx Page 2 of 10/15/2024
MINIMUM REQUIREMENTS FOR WATER SYSTEM
Source (indoor + outdoor)Storage (indoor + outdoor + fire)
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
1,044 153.2 526 170,338
2.1 Does this system have adequate source capacity (per R309-510-7)?
This source capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
Required Source Capacity 153.2 gpm
Existing Source Capacity 350.0 gpm
Source Capacity Deficit None gpm
Existing % of Total Req'd 228.5%
Koosharem Capacity.xlsx Page 3 of 10/15/2024
2.2 Does this system have adequate storage capacity (per R309-510-8)?
This storage capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
Total Required Storage 170,338 gal
Existing Storage Capacity 500,000 gal
Storage Capacity Deficit None gal
Required Fire Storage 60,000 gal
Is storage deficiency solely due to
fire storage?Not Applicable
Existing % of Total Req'd 293.5%
3. Transient PWS Indoor Water Use — ERC Calcuation (See R309-510, Tables 510-1, 2, & 4 for other facility types.)
MINIMUM REQUIREMENTS FOR INDOOR USE
Source Storage
Facility Type GPD/person*GPD/site or pad Gallons/person Gallon/site or
pad ERC/site or pad Total # of sites/pads ERCs
Modern Recreation Camp 60 0 30 0 0.00 0 0.0
Semi-Developed Camp w/ flush toilets 20 0 10 0 0.00 0 0.0
Semi-Developed Camp w/o flush toilets 5 0 2.5 0 0.00 0 0.0
RV Park N/A 100 N/A 50 0.13 0 0.0
Number of people per camp site 0
Source
(GPD/vehicle)
Storage (Gal.
/vehicle)
ERC/1000
vehicles served
Vehicles
served/day ERCs
Roadway Rest Stop w/ flushometer valves 7 3.5 8.8 0 0.0
4. Data Input for Calculating ERCs, Source and Storage 4.2 Summary - Existing Sources (enter in green cells below)
Koosharem Total Existing Source Capacity (in gpm)350
4.1 Projected ERCs Calculation (optional)WS001 Brown Spring 70
Total Projected ERCs 0 WS002 1986 Well 280
Existing Residential Connections
Obligated Future ERCs (enter below)
Koosharem Capacity.xlsx Page 4 of 10/15/2024
Maximum ERCs (assuming indoor use only)630
4.3 Summary - Existing Storage Tanks (enter below)
Total Existing Storage Cap. (in gallons)500,000
ST001 Tank #1 200,000
ST002 Tank #2 100,000
ST003 Tank #3 200,000
(Enter notes here. If additional space is needed, click the "Additional Notes"
tab on the bottom of the screen.)