DDW-2025-000865

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Date Standard Effective: Mon Jan 27 16:33:37 MST 2025
Peak Day Source Demand per ERC (gal/day): 1,033a
Average Annual Demand per ERC (gal/day): 163,772b
Equalization Storage per ERC (gal/day): 449c
aFrom Engineering Report dated October 16, 2023
bFrom Engineering Report Dated October 16, 2023
cFrom Engineering Report dated October 16, 2023
PAROWAN CITY WATER SYSTEM PWS ID: UTAH11010
Admin Name: ALDO GIOVANNI BIASI
Address: P.O Box 576
City, State, Zip: Parowan, UT 84761
Phone:
Email: [e-mail]
System Type: Community
Population: 3,000
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2018, 2019, 2020, 2021
Peak Day Source Demand per ERC (gal/day): 959
Average Annual Demand per ERC (gal/year): 121,090
Equalization Storage per ERC (gal): 332
x
x
x
(1 + 0.0)
(1 + 0.0)
(1 + 0.0)
=
=
=
959
121,090
332
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 449
Existing Storage (gal): 2,000,000
ERCs: 1,887
Required Storage w/o Fire Flow: 847,263
Required Fire Storage (gal): 180,000
Required Storage w/Fire (gal): 1,027,263
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage Deficiency
Peak Day Source Demand per ERC (gpm): 0.72
Existing Source Capacity (gpm): 3,242
ERCs: 1,887
Required Source Capacity (gpm): 1,359
Source Deficiency: 0
Source Deficiency (%): 0.0
Year Peak
Day
Source
Demand
(gal/day)
Average
Annual
Demand
(gallons)
ERCs Peak
Demand
per ERC
(gal/day)
Avg
Annual
Demand
per ERC
(gal/day)
Equaliza
tion
Storage
per ERC
(gal/day)
OP
Days
2021 977,553 177,393,284.4 1,887 518 94,009 258 365
2020 1,010,138 180,756,066.72 1,855 545 97,443 266 366
2019 958,001 154,727,088.84 1,824 525 84,829 232 365
2018 1,720,493 217,235,086.17 1,794 959 121,090 332 365
Variability:0.052 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
2021 662,949 351 1.47
2020 762,386 411 1.32
2019 673,986 370 1.42
2018 1,335,446 744 1.29
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
No Source Deficiency
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST001 MAIN CANYON TANK 1,000,000
ST003 HWY 91 TANK 1,000,000
Storage Totals: 2,000,000 GAL
Source ID Source Name Flow Rate (GPM)
WS004 CANYON WELL 1,150
WS006 RACETRACK WELL (YARD)1,000
WS002 MAIN CANYON SPRING 92.1
WS007 NORTHWEST WELL
WS008 300 EAST WELL 1,000
Source Totals: 3,242 GPM