DDW-2025-001169

System Number 18172
1.1 Indoor Water Use
Number of residential connections - - - - - - - - - - -- - - - - - - - - - - - - - - - - - -- - - - - - - - -176
Number of other connections - - - 1 ERCs of other connections 1.0
Total Equivalent Residential Connections (ERCs)177.0
gpd/ERC Total (gpm) Gallons/ERC Total (gallons)
800 98.3 400 70,800
1.2 Outdoor Water Use
Is the drinking water used for outdoor irrigation?
Residential ERCs using drinking water for irrigation - - - - - - - - - - - - > > >176
Percentage of Residential ERCs using DW for irrigation - - - - - - - - - - - - > > >100%Map Zones
Average irrigated acreage per residential connection - - - - - - - - - - - - > > >0.05 1
Total irrigated acreage of other connections (park, school, etc.)- - - - - - - - - - - - > > >0.11 2
Irrigation zone 4 3
4
5
6
gpd/ERC Total (gpm) Gallons/ERC Total (gallons)
285 35.3 142 25,376
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 2
Required Fire Suppression Storage (in gallons) - - - - - - - - - - - - - - - - - - - - > > >120,000
2. Summary of Water System Capacity Requirements
gpd/ERC Total (gpm) Gallons/ERC Total (gallons)
1,085 133.6 542 216,176
2.1 Does this system have adequate source capacity (per R309-510-7)?
Required Source Capacity 133.6 gpm
Existing Source Capacity 1,348.0 gpm
Source Capacity Deficit None gpm
Existing % of Total Req'd 1008.9%
Storage (indoor + outdoor + fire)
This source capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
System Name
Source
Cottonwood Coves Inc.
Storage
(*Verify req'd fire flow and duration with local fire code officials.* Enter notes
here, e.g. fire official contact info or comments.)
(Enter notes here regarding whether and what %
of irrigation water is supplied by PWS.)
Source (indoor + outdoor)
Storage
MIN. REQUIREMENTS FOR INDOOR WATER USE
MINIMUM REQUIREMENTS FOR WATER SYSTEM
Division of Drinking Water — Water System Capacity Calculation Sheet (Last Update 3/30/2017)
*Enter the green cells only*
(Example: water use of 2 factories
equals to water use of 55 homes.)
Source
MIN. REQUIREMENTS FOR IRRIGATION USE
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 or WaterLink.
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.
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2.2 Does this system have adequate storage capacity (per R309-510-8)?
Total Required Storage 216,176 gal
Existing Storage Capacity 260,290 gal
Storage Capacity Deficit None gal
Required Fire Storage 120,000 gal
Not
Applicable
Existing % of Total Req'd 120.4%
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)1,348
4.1 Projected ERCs Calculation (optional)WS001 Murray City 18024 1348
Total Projected ERCs 177
Existing Residential Connections 177
Obligated Future ERCs (enter below)
Maximum ERCs (assuming indoor use only) 2426.4
4.3 Summary - Existing Storage Tanks (enter below)
Total Existing Storage Cap. (in gallons)260,290
WS001 Murray City 18024 260,290
Semi-Developed Camp w/ flush toilets
Cottonwood Coves Inc.
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?
Murray City assures the Capacity and storage is sufficient. Edocs
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-2017-004386 - 0901a068806e65f1 (5) Page 2 of 2 1/23/2025