DDW-2025-007174

System Number 23076
1.1 Indoor Water Use
Number of residential connections - - - - - - - - - - -- - - - - - - - - - - - - - - - - - -- - - - - - - - 729
Number of other connections - - - 24 ERCs of other connections 105.0
Total Equivalent Residential Connections (ERCs)834.0
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)ac-ft/yr/ERC Total (ac-ft/yr)
800 463.3 400 333,600 0.45 375.30
1.2 Outdoor Water Use
Is the drinking water used for outdoor irrigation?
Residential ERCs using drinking water for irrigation - - - - - - - - - - - - > > >182
Percentage of Residential ERCs using DW for irrigation - - - - - - - - - - - - > > >25%Map Zones
Average irrigated acreage per residential connection - - - - - - - - - - - - > > >0.25 1
Total irrigated acreage of other connections (park, school, etc.)- - - - - - - - - - - - > > >1.60 2
Irrigation zone 4 3
4
5
6
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)ac-ft/yr/ERC Total (ac-ft/yr)
1,426 186.8 712 134,319 0.47 88.19
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 1,500
Maximum fire suppression duration (in hours) for water system or pressure zone 2
Required Fire Suppression Storage (in gallons) - - - - - - - - - - - - - - - - - - - - > > >180,000
2. Summary of Water System Capacity Requirements
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)ac-ft/yr/ERC Total (ac-ft/yr)
2,226 650.1 1,112 647,919 0.92 463.49
2.1 Does this system have adequate source capacity (per R309-510-7)?
Required Source Capacity 650.1 gpm
Existing Source Capacity 1,867.0 gpm
Source Capacity Deficit None gpm
Existing % of Total Req'd 287.2%
MINIMUM CAPACITY REQUIREMENTS FOR WATER SYSTEM
Storage (indoor + outdoor + fire)Water Rights (indoor + outdoor)
This source capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
Water Rights
(*Verify req'd fire flow and duration with local fire code officials.* Enter notes
here, e.g. fire official contact info or comments.)
15% irrigation by private wells, 85% from PWS
Source (indoor + outdoor)
Storage
Source
Water Rights
Division of Drinking Water — Water System Capacity Calculation Sheet (Last Update 2/12/2016)
*Enter the green cells only*
(Example: water use of 2 factories
equals to water use of 55 homes.)
MINIMUM REQUIREMENTS FOR INDOOR WATER USE
System Name
MINIMUM REQUIREMENTS FOR IRRIGATION USE
Source
Oquirrh Mountain Water Co
Storage
Yes No
Yes No
Enter number of non-residential connections, e.g., 2 industrial connections.
Convert "Number of other connections" (Cell E9) to ERCs here. [ERCs of other connections = peak day demand of other connections in gal per day / 800 gpd]
Enter estimated irrigated acre
Enter total irrigated acres of other connections here.
Enter fire flow in gpm.
Enter duration in hours.
Autolink to 4.2 "Total Existing Source Capacity" cell below.
Select Irrigated Zone # from the pick list. See "Irrigation Demands & Map" tab on the bottom of the screen.
Less than 100% indicates: (1) additional source capacity is needed, and
Autolink to 2 "Total Source" cell above.
Source deficit indicates that: (1) additional source capacity is needed, and (2) source deficiency should be assessed.
DDW-2022-040741 - Oquirrh Mtn Page 1 of 2 8/4/2025
2.2 Does this system have adequate storage capacity (per R309-510-8)?
Total Required Storage 647,919 gal
Existing Storage Capacity 1,000,000 gal
Storage Capacity Deficit None gal
Required Fire Storage 180,000 gal
Not
Applicable
Existing % of Total Req'd 154.3%
3. Transient PWS Indoor Water Use — ERC Calcuation (See R309-510, Tables 510-1, 2, & 4 for other facility types.)
GPD/person*GPD/site or pad Gallons/person Gallon/site
or pad ERC/site or pad Total # of
sites/pads ERCs
60 0 30 0 0.00 0.0
20 0 10 0 0.00 0.0
5 0 2.5 0 0.00 0.0
N/A 100 N/A 50 0.13 0.0
Number of people per camp site
Source
(GPD/vehicle)
Storage
(Gal./vehicle)
ERC/1000
vehicles served
Vehicles
served/day ERCs
7 3.5 8.8 0.0
4. Data Input for Calculating ERCs, Source and Storage 4.2 Summary - Existing Sources (enter in green cells below)
Total Existing Source Capacity (in gpm)1,867
4.1 Projected ERCs Calculation (optional)WS001 Hole in the Rock 1400
Total Projected ERCs 587 WS002 Big Canyon Well 200
Existing Residential Connections 587 WS003 Conner Well 267
Obligated Future ERCs (enter below)
Maximum ERCs (assuming indoor use only)3360.6
4.3 Summary - Existing Storage Tanks (enter below)
Total Existing Storage Cap. (in gallons)1,000,000
ST001 Hole in Rock Storage 1,000,000
Semi-Developed Camp w/ flush toilets
Oquirrh Mountain Water Co
Roadway Rest Stop w/ flushometer valves
Semi-Developed Camp w/o flush toilets
This storage capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
Is storage deficiency solely due
to fire storage?
(Enter notes here. If additional space is needed, click the "Additional
Notes" tab on the bottom of the screen.)
RV Park
Facility Type
Source
MINIMUM REQUIREMENTS FOR INDOOR USE
Modern Recreation Camp
Storage
Autolink to 4.3 "Total Existing Storage Capcity" cell below.
If applicable, enter number of people per camp site here.
Storage deficit indicates that: (1) additional storage volume is needed, and (2) storage deficiency should be assessed.
Use this number in Cell I8 ("Number of residential connections") on Page 1 to calculate PROJECTED demand & req'ts (including both existing & future connections).
Diaphragm or air pressure tanks shall NOT be considered effective storage volume for (1) community systems, or (2) NTNC with significant demand UNLESS an exception has been granted.
Autolink to 2 "Total Storage" cell above.
If applicable, use this number in cell I8 or cell I9 on Page 1.
If NO, answer one of question set 2.01 to 2.05 in ESS.If YES, answer one of question set 2.06 to 2.10 in ESS.
Less than 100% indicates: (1) additional storage capacity is needed, and (2) storage deficiency should be assessed.
DDW-2022-040741 - Oquirrh Mtn Page 2 of 2 8/4/2025