DDW-2024-012173

Clarkston Town 2024.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 Clarkston Town 2024 System Number 03004
1.1 Indoor Water Use
Number of residential connections - - - - - - - - - - -- - - - - - - - - - - - - - - - - - -- - - - - - - - -281
Number of other connections - - - 4 ERCs of other connections 6.0 (Example: water use of 2 factories
equals to water use of 55 homes.)
Total Equivalent Residential Connections (ERCs)287.0
MIN. REQUIREMENTS FOR INDOOR WATER USE
Source Storage
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
800 159.4)400 (114,800)
1.2 Outdoor Water Use
Is the drinking water used for outdoor irrigation? Yes
Residential ERCs using drinking water for irrigation - - - - - - - - - - - - > > >281
Percentage of Residential ERCs using DW for irrigation - - - - - - - - - - - - > > >100%Map Zones
Average irrigated acreage per residential connection - - - - - - - - - - - - > > >0.25 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)
1,220 238.1 632 177,592
1.3 Fire Flow Water Use
Does the water system provide fire protection?Yes
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
(*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
MINIMUM REQUIREMENTS FOR WATER SYSTEM
Source (indoor + outdoor)Storage (indoor + outdoor + fire)
gpd/ERC Total (gpm)Gallons/ERC Total (gallons)
2,020 397.6 1,032 412,392
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 397.6 gpm
Existing Source Capacity 441.0 gpm
Source Capacity Deficit None gpm
Existing % of Total Req'd 110.9%
Clarkston Town 2024.xlsx Page 2 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 412,392 gal
Existing Storage Capacity 1,100,000 gal
Storage Capacity Deficit None gal
Required Fire Storage 120,000 gal
Is storage deficiency solely due to
fire storage?Not Applicable
Existing % of Total Req'd 266.7%
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 8.8 700 6.1
4. Data Input for Calculating ERCs, Source and Storage 4.2 Summary - Existing Sources (enter in green cells below)
Clarkston Town 2024 Total Existing Source Capacity (in gpm)441
4.1 Projected ERCs Calculation (optional)WS001 Northfork 230 78
Total Projected ERCs 447 WS002 Big Birch 330 110
Existing Residential Connections 400 WS003 Little Birch 50 50
Obligated Future ERCs (enter below)47 WS005 City Creek 50 50
Example 1 Subdivision 60 WS006 New Well
Example 2 Homes 18 WS007 Woodward 20 7
Example 3 Estates 9 WS008 Craw 18 6
Another Example Place 50 WS009 Christianse 29 10
Serendipity Stable 5 WS010 Goodsell 16 5
River of No Return 46 Total Cap 743
Rock School 12
Add Flow from shared sources 125
Maximum ERCs (assuming indoor use only)793.8
4.3 Summary - Existing Storage Tanks (enter below)
Total Existing Storage Cap. (in gallons)1,100,000
ST002 150 K 150,000
ST003 300 K 300,000
ST004 650 K 650,000
(Enter notes here. If additional space is needed, click the "Additional Notes"
tab on the bottom of the screen.)