San Angelo Water Supply Status - 2012
San Angelo Water Utilities
TopicsCustomer ProfileWater DemandsWater SuppliesWater Supply StatusNew Water SuppliesDrought Management PolicyCritical Supply Projection
Customer ProfilePopulation: 93,200Water Connections: 32,000Water demand by customer category:
Residential 62%Commercial 20%System Operation 14%Industrial 4%
Notable entities:Goodfellow Air Force BaseAngelo State UniversityShannon Medical CenterCommunity Medical Center
Water Demands
Annual Daily Average: 14 mgd
Summer Peak: 26 mgd
Winter Daily Average: 10 mgd
Average Annual Usage: 16,000 acre-feet
Water SuppliesAll current water supplies are surface water
Reservoirs and LakesHighly impacted by drought
Primary Sources:O.H. Ivie ReservoirTwin Buttes ReservoirLake NasworthyO.C. Fisher ReservoirLake Spence
O.H. Ivie ReservoirOwned and operated by the Colorado River
Municipal Water DistrictPurpose: Water SupplySupplies: Odessa, Big Spring, Snyder, Midland,
Abilene, San Angelo, Ballinger and Millersview-Doole
Storage Capacity: 554,339 acre-feetCurrent Storage: 98,400 acre-feet 2011 Change in Storage: -81,820 acre-feet
Twin Buttes ReservoirU.S. Bureau of ReclamationManaged under contract by the City of San
AngeloPurpose: Water Supply, Irrigation and Flood
Control
Supplies: City of San Angelo and Tom Green County Water Control Improvement District #1
Storage Capacity: 186,244 acre-feetCurrent Storage: 13,100 acre-feet2011 Change in Storage: -22,344 acre-feet
Lake Nasworthy
Owned and operated by the City of San Angelo
Purpose: Water Supply Supplies: City of San Angelo Storage Capacity: 12,500 acre-
feetCurrent Storage: 8,200 acre-feet2011 Change in Storage: -120 acre-
feet
O. C. FisherCOE - Upper Colorado River AuthorityPurpose: Water Supply and Flood ControlSupplies: City of San Angelo and UCRA
Storage Capacity: 119,000 acre-feet
Current Storage: 1,000 acre-feet
2011 Change in Storage: -771 acre-feet
Lake Spence
Colorado River Municipal Water District
Purpose: Water Supply
Supplies: Odessa, Big Spring, Snyder, Midland, San Angelo
Storage Capacity: 488,000 acre-feet
Current Storage: 2,300 acre-feet
2011 Change in Storage: -13,190 acre-feet
Historic Lake Levels
1930
1933
1936
1939
1942
1945
1948
1951
1954
1957
1960
1963
1966
1969
1972
1975
1978
1981
1984
1987
1990
1993
1996
1999
2002
2005
2008
2011
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
200,000
Lake NasworthyTwin ButtesO.C. Fisher
New Water SuppliesHickory Groundwater Supply
35,000 acres of groundwater rights acquired in 1972
62 miles southeast of San Angelo in McCullough County near Brady, Texas
Arbitrated water allocations:Development Phase Year Allocation
I 2013 6 mgd II 2026 9 mgd
III 2036 10.7 mgd
New Water Supplies (Cont.)Hickory Groundwater Supply (Continued)
Project Cost: $120,000,000
Wellfield and transmission piping under contract with projected completion of June 2013.
Pump Station and Well Development bidding and projected completion of June 2013
Treatment Plant for Radionuclides projected for completion in early 2014.
Drought Management Policy
Multi-stage with trigger points based on supplies
Principles:Public EducationProgressive restrictions on outside watering
until prohibited in final stageProgressive surcharges for ‘excess’ use of
water Enforcement Provisions
Drought Management Policy (Cont.)Implementation Stages are based on available
supply from all sources:
Water Conservation: > 2 years supply
Drought Level 1: < 2 years supply
Drought Level 2: 18 months or less
Drought Level 3: 12 months or less
Critical Supply Projection
Worst case scenario: No Runoff
Annual demand: 16,000 acre-feet
Critical Supply Timeline: 19 months
Questions