Summary of City of Austin Population and Water Demand Revision Requests for Region K Water Planning

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Summary of City of Austin Population and Water
Demand Revision Requests for Region K Water
Planning
Lower Colorado Regional Water Planning Group
Meeting Burnet, Texas July 10, 2013
Austin Water Utility Water Resources Management
Program
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WILLIAMSON
Impact Fee Service Area Boundary
City Limits
TRAVIS
BASTROP
HAYS
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City of Austin Water Demands for Regional Water
Planning Process

• City of Austin water demands are made up of
  multiple components
• Municipal Demands
• Within Austin and in Extra-Territorial
  Jurisdiction (ETJ)
• Manufacturing Demands
• Wholesale Customer Demands
• Austin also has Steam-Electric water demands for
  power generation
• previously addressed in the non-municipal water
  demand review process

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City of Austin Water Demands for Regional Water
Planning Process

• Municipal water demand projections
• Water User Group (WUG) Population multiplied by
  WUG Municipal Per Capita Demand
• Projections represent conservative dry condition
  baseline water demand projections
• Incorporate plumbing code change-driven per
  capita water use reductions
• At this stage of the planning process projections
  do not incorporate additional savings through
  implementation of water conservation and reuse
  water management strategies this comes later in
  the planning process

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Overview of City of Austin Revision Request Items

• Population
• Approve use of 1.0 Migration Scenario Projection
  for Travis County with extrapolation to 2070
• Apply Travis County population increases to
• main Austin WUG in Travis County
• Travis County Other WUG
• Other Travis County WUG population increase
  requests
• Per Capita Demand
• For Austin WUGs (Travis, Williamson, and Hays
  County)
• Approve use of base dry year per capita adjusted
  for Drought Contingency Plan (DCP) Implementation
• Approve use of revised projected decadal per
  capita demands incorporating plumbing code and
  clothes washer savings already achieved by the
  City of Austin

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Travis County Population Projection Comparison
2020 2030 2040 2050 2060 2070
COA Projection 1,350,009 1,749,304 2,158,652 2,474,503 2,801,808 3,094,939
Draft TWDB Projection 1,237,072 1,428,425 1,608,857 1,810,892 1,989,210 2,155,066
Draft 1.0 Migration Scenario 1,273,260 1,508,642 1,732,860 1,990,820 2,219,764 2,475,037

• Revision Request
• Approve use of 1.0 Migration Scenario Projection
  for Travis County with extrapolation to 2070

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Austin WUG Base-Year Per Capita Water Demand
Total Net Use (gallons) Total Net Use (acre-feet) Population Gallons Per Capita Daily (GPCD)
Per TWDB Report includes water savings from COA DCP Stage 2 implementation 45,889,103,496 140,828 820,611 153.2
Calculation if Stage 2 was not in effect 47,219,883,851 144,913 820,611 157.7

• Revision Request
• Approve use of base year per capita water demand
  factor adjusted to not include Drought
  Contingency Plan (DCP) implementation effects
• DCP implementation is a drought response measure
  that should not be imbedded in the baseline
  projection

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Austin WUG Per Capita Water Demand Projection
Base-Year 2020 2030 2040 2050 2060 2070
TWDB Projection 153 144 140 138 137 137 137
Projection with COA Adjustments 157 151 149 149 149 149 149
For reference GPCDs from 2011 plan Base Year
174 and 2060 169

• Revision Request
• Approve use of revised projected decadal per
  capita demands incorporating plumbing code and
  clothes washer savings already achieved by the
  City of Austin

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