DDW-2025-004919

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Date Standard Effective: Thu May 29 09:01:36 MDT 2025
Peak Day Source Demand per ERC (gal/day): 581
Average Annual Demand per ERC (gal/year): 155,400
Equalization Storage per ERC (gal): 425
SNAKE CREEK MUTUAL WATER PWS ID: UTAH26011
Admin Name: JACOB SWEN ANDERSON
Address: PO Box 384
City, State, Zip: Salt Lake City, UT 84110
Phone: [phone]
Email: [e-mail]
System Type: Transient Non-Community
Population: 100
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2022, 2023, 2024
Peak Day Source Demand per ERC (gal/day): 581
Average Annual Demand per ERC (gal/year): 155,400
Equalization Storage per ERC (gal): 425
x
x
x
(1 + 0.0)
(1 + 0.0)
(1 + 0.0)
=
=
=
581
155,400
425
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 425
Existing Storage (gal): 117,000
ERCs: 57
Required Storage w/o Fire Flow: 24,225
Required Fire Storage (gal): 60,000
Required Storage w/Fire (gal): 84,225
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage Deficiency
Peak Day Source Demand per ERC (gpm): 0.4
Existing Source Capacity (gpm): 41
ERCs: 57
Required Source Capacity (gpm): 23
Source Deficiency: 0
Source Deficiency (%): 0.0
No Source Deficiency
Year Peak
Day
Source
Demand
(gal/day)
Average
Annual
Demand
(gallons)
ERCs Peak
Demand
per ERC
(gal/day)
Avg
Annual
Demand
per ERC
(gal/year)
Equaliza
tion
Storage
per ERC
(gal)
OP
Days
2024 32,585 8,713,255.74 56 581 155,400 425 366
2023 22,809 7,243,667.73 56 407 129,167 354 365
2022 22,809 7,165,463.49 57 400 125,644 344 365
Variability:0.018 0.0 0.0 0.0
Year Peak Month Average
(gal/day)
Peak Month Average
per ERD (gal/day)
Ratio of PD/ERC to
Peak Month Avg/ERC
2024 24,701 441 1.32
2023 20,602 367 1.11
2022 25,122 441 0.91
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST001 MORGAN-SPENCER RESERVOIR 117,000
Storage Totals: 117,000 GAL
Source ID Source Name Flow Rate (GPM)
WS003 MILL FLAT LOWER SPRING 20.7
WS004 MILL FLAT UPPER SPRING 20.7
Source Totals: 41 GPM