city of austin municipal water supply overview · city of austin municipal water supply overview...
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City of Austin
Municipal Water
Supply Overview
Colorado & Lavaca Rivers and Matagorda & Lavaca Bays
Basin and Bay Area Stakeholder Committee Meeting
October 28, 2010
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October 2010 2
Outline
Overview
City of Austin
• Water Supplies and Demand
• Major System Components
• Water Conservation and Reclaimed Water
Key Water Supply Points
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October 2010 3
Colorado & Lavaca Rivers and Matagorda & Lavaca Bays
Basin and Bay Area
Bay City
Wharton
Columbus
Austin
Llano
San Angelo
LaMesa
Brownwood
Big Spring
Midland-Odessa
Brady
Menard
Edna
Bastrop
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October 2010 4
Fayette
Power
Project
South
Texas
Project
Austin Area: includes
wholesale customers and
power plant needs (Decker,
Sand Hill, and future)
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October 2010 5
Region K Population Projections
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October 2010 6
Region K Total Water Demand Projections
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October 2010 7
Industrial/Stm-Elec-
Other 11%
Austin - Munic.
18%
Other Munic. 7%
Agricultural 58%
Environment 4%
Austin Energy* 1%Rec.& Firm Irrig.
1%
Other 0%
2009 Total Lower Colorado River Water Use
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October 2010 8
City of Austin Water served population
• Current: 890,000
• 2060 Projected: 2 million
Current City limits land area = 289 square miles
Utility service area = 538 square miles
Retail and wholesale, inside and outside City limits
Wholesale service includes Municipal Utility
Districts, cities, and private companies
Major demand categories:
• Municipal and manufacturing
• Steam-Electric
Austin Water Service Area
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October 2010 9
City of Austin Water Supply
Current municipal supply:• Colorado River (surface water)
Supply comes from a combination of:• State-granted water rights (run-of-river)
• Water supply contracts with LCRA
(providing firm back-up to ROR rights)
Demand management/supply:• Water Conservation
• Water reclamation program – direct reuse
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October 2010 10
Recent Water Contracts
1999 Agreement• Firm back-up for Austin’s senior run-of-river rights
and additional firm water totaling 325,000 AF/yr
• Term extends through year 2050 with option for Austin to extend to year 2100
2007 Supplemental Water Supply Agreement (SWSA)• Provides up to 250,000 AF/yr of additional supply
through the year 2100 to be jointly planned, incrementally
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October 2010 11
Austin Municipal Demands
AWU Demand for Municipal Needs
• FY 08/09: 163,668 AF/yr (146 MGD)
• Highest fiscal year: 173,707 AF/yr (FY 05/06)
• Most recent 5-year average: 159,730 AF/yr
Fiscal Year Demand (AF/yr)
04/05 157,661
05/06 173,707
06/07 140,763
07/08 162,853
08/09 163,668
1 acre-ft is 325,851 gallons
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October 2010 12
Austin Water System at a Glance
Treatment: 285 MGD• Ullrich: 167 MGD
• Davis: 118 MGD
Peak day pumpage: • Year 2009 Peaks:
• 239.7 MGD (July 16, 2009) and 222.6 MGD (July 17, 2009) –period of operation associated with a tank inspection
• 221.9 MGD (August 7, 2009)
• Historic Peak:
• 247 MGD (September 26, 2005)
Annual production: 53 billion gallons
System Storage (Total): 167 million gallons
Distribution:• 9 major pressure zones
• 35 pump stations, 34 reservoirs
• 3,600 miles of pipe, 25,000 public hydrants
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October 2010 13
Austin Wastewater System at a Glance
Treatment: 150 MGD• South Austin Regional: 75 MGD
• Walnut Creek WWTP: 75 MGD
Recent Combined Annual Average: • FY 08/09: 82 MGD
• FY 07/08: 83 MGD
• FY 06/07: 98 MGD
Collection and small plants:• 124 lift stations
• 2,600 miles of pipe, 46,700 manholes
• 7 small plants, also participant with Round Rock, Cedar Park, and Leander in Brushy Creek Regional WWTP system operated by the Brazos River Authority
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October 2010 14
Wastewater Effluent
Recent 5-year average combined effluent
discharge: 95,386 AF/yr (85 MGD)
Fiscal Year Combined Treated Effluent (AF/yr)
04/05 95,701
05/06 87,153
06/07 109,323
07/08 92,860
08/09 91,894
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October 2010 1515
Conservation & Drought Contingency
Plans
* Partial list
Conservation
• Implementing aggressive conservation program
• 2 day per week watering restrictions in effect:
• Residential: May to September
• Commercial: year-round
• In August 2009 City of Austin went into Stage 2 watering restrictions:
limited to 1 day per week
• Resulted in significant revenue loss
• Aggressive leak detection repair program and main replacement
• Evaluating potential for lowering municipal use per capita to a goal of
140 gpcd by 2020
• Stage 3 – no outdoor watering*
City of Austin Drought Contingency Plan - supply triggers for watering restrictions with implementation to be determined by the City Manager:
• Combined storage level in Highland Lakes
• 900,000 acre-feet trigger Stage 2
• 681,000 acre-feet trigger Stage 3
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October 2010 16
Water Conservation - Programs
Toilet, Washing Machine, Pressure Valve
and Rainwater Harvesting Rebates
Free Irrigation Audits
Mandatory Watering Restrictions
Education, Outreach, Speakers Bureau
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October 2010 17
The Current System
• Highly treated wastewater effluent
• Major uses:
Irrigation
Cooling
Manufacturing
Industrial
• Recent annual use:
6,100 acre-feet/year
Water Reclamation
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October 2010 18
Direct reuse system - “third utility”
Targeting expansion of the system in high use areas (University of Texas for example).
Long-range system plan over 130 miles of pipe, 7 tanks and 10 billion gallons of annual use (~30,000 ac-ft/yr)
Water Reclamation Initiative
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October 2010 19
Overview of Key Water Supply Points
Firm water suppliesLong-term certainty and supply reliability
Supply availability through a wide-range of conditions including a repeat of the drought of record
Water supply stewardship:Resource use efficiency:
• Water conservation programs
• Leak reduction
• Reclaimed water program
Affordability: water supply at a reasonable cost
Water quality protection and consistency
Infrastructure investment – asset management:Capital Improvements Program (CIP) funding for system improvements to serve growth and replace aging infrastructure
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October 2010 20
Questions?
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October 2010 21
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October 2010 22
Typical City of Austin
Water Consumption Per Customer Class
Current Water
Customers:
Approximately
213,000