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Integrated Watershed PlanningIntegrated Watershed PlanningIn TexasIn Texas
An Evolving ProcessAn Evolving Process
National Waterways Conference
Charleston, West Virginia
September 25, 2009
Bill Mullican, P.G.,Pflugerville, Texas
Why Plan?Lake Meredith 1999
Why Plan? Lake Meredith 2009
Water supply for 11 cities on the High Plains of Texas
Why Plan? Lake Travis 2009 - Water supply for
Lower Colorado River Basin including Austin
610
620
630
640
650
660
670
680
690
700
Jan-40 Jan-50 Jan-60 Jan-70 Jan-80 Jan-90 Jan-00 Jan-10
Month/Year
Min
imu
m L
ev
el
[fe
et
ab
ov
e M
SL
]
Lake Travis
Why Plan?Why Plan?Lake LavonLake Lavon-2006-2006
Sole water supply for 1.5 million people northeast of Dallas
Why Plan? Texas Population 2000-2060
Senate Bill 1A New Water Supply
Planning Process
“Public Dialogue”
The Texas Model For Meeting Water Resource Needs in the 21st Century
Water Planning Prior to SB 1Water Planning Prior to SB 1
Water Planning Post SB 1Water Planning Post SB 1
DiverseDiverseInterest GroupsInterest Groups
RepresentedRepresented
Incentives to Participate inRegional Water Planning
PermitsFunding
Lessons Learned
• Inadequacy of data and science needed for planning at local and regional level quickly became focus of process
• Adaptive planning and management required
• Focus of planning proccess shifted to plan implementation after first round of planning
Senate Bill 1A New Water Supply
Planning Process
“Data and Science”
Building Blocks
• Demographics• Groundwater Availability• Surface Water Availability• Environmental Flows• Water Quality• Socioeconomic Impacts
Regional Water Planning Areas
Major River and Coastal Basins and Water Major River and Coastal Basins and Water Availability ModelsAvailability Models
Surface Water Availability Models
Environmental flows addressed in SB 2 and SB 3 – Progress Towards Integrated
Watershed Planning in Texas
Streams
Rivers
Bays & Estuaries
Texas Instream Flow Program
Freshwater InflowRecommendations
Optimization Model
TxEMP
Hydrodynamic & ConservationTransport Model
TxBLENDHydrographic Survey
Nutrient Analysis
Sediment Analysis
Fisheries Analysis
Objectives & Constraints
Fisheries Analysis
Wetlands
Hydrology
Verification
Bays and Estuaries Program
The Major Aquifers of TexasThe Major Aquifers of Texas
The Minor Aquifers of TexasThe Minor Aquifers of Texas
Groundwater availability models:Major aquifers
Trinity Aquifer Study Area
Fredericksburg
Kerrville
Boerne
San Antonio
NewBraunfels
SanMarcos
Austin
Hondo
DrippingSprings
Blanco
MASON
KERR
UVALDE MEDINA
KENDALLGILLESPIE
BEXAR
LLANOBLANCO
Bandera
N
0 5 10 15 mi
TEXAS
Study area/modelboundaryCities
Roads
Basic Steps inBasic Steps inTexas Water PlanningTexas Water Planning
• 50 year planning period
• Projection of population
• Projection of water demands
• Determine existing supplies
• Determine future surplus or needs• Evaluate and select water management
strategies to meet needs
Total = 2,564 Local Plans
- Cities: 956- Utilities: 378- County-Others: 254- Manufacturing: 174 - Steam Electric: 83
- Livestock: 254 - Mining: 226- Irrigation: 239
Projected Water Demand & SupplyProjected Water Demand & Supply
18.3 19.0 19.6 20.1 20.8 21.6
17.916.9 16.1 15.4 15.0 14.6
0
4
8
12
16
20
24
2010 2020 2030 2040 2050 2060
mill
ion
s o
f ac
re-f
eet
Water Demand Water Supply
2060About 85 percent
2010About 45 percent
Percent of the state’s projected population Percent of the state’s projected population without adequate waterwithout adequate water during a repeat of during a repeat of
drought of recorddrought of record
Water Management StrategiesWater Management Strategies
Water Conservation
Ground Water
Surface Water
Water Reuse
Conjunctive Use
Reservoirs
Desal
Conveyances
2007Water Plan
2007Water Plan
Senate Bill 1A New Water Supply
Planning Process
“Reliable Funding”
Funding for projects in the 2007 Texas Water Plan
50 years: $30.9B
2008-2009: $762M (funded)
2010-2011: $475M (approved)
The Texas Model For Meeting Water Resource Needs in the 21st Century
“As a result of several successive years of moisture deficiency, people have become water conscious, and all sorts of plans are being suggested for doing something about it. Many of these plans have merit, but any plan that promises quick relief through human agency is fraud. A good rain is the only quick solution to the problem of the drought, and nature has as yet not yielded the secret of making rain. Unfortunately a good rain washes away more than the drought; it washes away much of man’s interest in providing for the next one, and it washes the supports from under those who know that another dry cycle is coming and who urge their fellows to make ready for it.”
More Water For Texas byWalter Prescott Webb, 1953
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