DDW-2025-004423

Capacity calculation sheet Page 1 of 5/9/2025
Division of Drinking Water Water System Capacity Calculation Sheet—
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(Last Update 3/30/2017)
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
100%
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
475.2
900.0
541,998
*Enter the green cells only*
Winchester Hills Water 27049System Name System Number
per residential connection
other connections
flow
duration
1.1 Indoor Water Use
1.2 Outdoor Water Use
1.3 Fire Flow Water Use
2. Summary of Water System Capacity Requirements
Number of residential connections - - - - - - - - - - -- - - - - - - - - - - - - - - - - - -
Number of other connections - - - ERCs of other connections
Total Equivalent Residential Connections (ERCs)
Source Storage
Is the drinking water used for outdoor irrigation?
Residential ERCs using drinking water for irrigation
Percentage of Residential ERCs using DW for irrigation
Average irrigated acreage
Total irrigated acreage of (park, school, etc.)
Irrigation zone
Source Storage
Does the water system provide fire protection?
Maximum fire demand (in gpm) for or
Maximum fire suppression (in hours) for or
Required Fire Suppression Storage (in gallons)

- - - - - - - - 364
1 1.0
364
0.15
1.00
(Enter notes here regarding whether and what % of
irrigation water is supplied by PWS.)
6
Enter notes here, e.g.
fire official contact info or comments.)
(Example: water use of 2 factories
equals to water use of 55 homes.)
365.0
MIN. REQUIREMENTS FOR INDOOR WATER USE
MIN. REQUIREMENTS FOR IRRIGATION USE
120,000
MINIMUM REQUIREMENTS FOR WATER SYSTEM
Source Storage
None
189.4%
800 400
1,058 745
1,858 1,145
202.8 146,000
272.4 275,998
475.2 541,998
Map Zones
1
2
3
4
5
6
water system pressure zone
water system pressure zone
1,000
2
(*Verify req'd fire flow and duration with local fire code officials.*
(indoor + outdoor)(indoor + outdoor + fire)
2.1 Does this system have adequate source capacity (per R309-510-7)?
Required Source Capacity gpm
Existing Source Capacity gpm
Source Capacity Deficit gpm
Existing % of Total Req'd
2.2 Does this system have adequate storage capacity (per R309-510-8)?
Total Required Storage gal
This source capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
This storage capacity assessment is a general overall system calculation. It may not reflect the variations in individual areas or pressure zones.
Capacity calculation sheet Page 2 of 5/9/2025
Existing Storage Capacity gal
Storage Capacity Deficit gal
gal
Is storage deficiency solely due to
fire storage?
Existing % of Total Req'd
w/ flush toilets
w/o flush toilets
w/ flushometer valves
703,000
120,000
MINIMUM REQUIREMENTS FOR INDOOR USE
60 0 30 0
20 0 10 0
5 0 2.5 0
N/A 100 N/A 50
7 3.5 8.8
Total Existing Source Capacity (in gpm)
Total Projected ERCs
98
Total Existing Storage Cap. (in gallons)
None
Not
Applicable
129.7%
Modern Recreation Camp 0.00 0.0
Semi-Developed Camp 0.00 0.0
Semi-Developed Camp 0.00 0.0
RV Park 0.13 0.0
Roadway Rest Stop 0.0
900
98
703,000
Required Fire Storage
(See R309-510, Tables 510-1, 2, & 4 for other facility types.)
Number of people per camp site
3. Transient PWS Indoor Water Use ERC Calcuation
4. Data Input for Calculating ERCs, Source and Storage
—
Source Storage
Facility Type
Source Storage
GPD/person*GPD/site or pad Gallons/person Gallon/siteor pad ERC/site or pad
(GPD/vehicle)(Gal./vehicle)
ERC/1000
vehicles served
Vehicles
served/day
Residential Connections
Obligated ERCs
Total # of sites/pads ERCs
ERCs
Existing
Future
0
0
0
0
0
0
WS002 Well 2 500
WS004 Well 1 replacement.400
0
ST001 Winchester Hills #1 433,000
ST002 600K Concrete Tank 270,000
316 Acre Feet
4.2 Summary - Existing Sources
4.1 Projected ERCs Calculation (optional)
4.3 Summary - Existing Storage Tanks
(enter in green cells below)
(enter below)
(enter below)
Winchester Hills Water
Maximum ERCs (assuming indoor use only)1620