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

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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