Water availability
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Water Availability. 1996 Texas drought Governor Bush asks “how much water do we have? How much are we using? How much do we need?” -- Ooops. No good answers! 1997 Senate Bill 1 passed by Legislature Regionalizes water planning in Texas and establishes surface water availability modeling

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Water Availability

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Water availability

Water Availability

  • 1996 Texas drought

    • Governor Bush asks “how much water do we have? How much are we using? How much do we need?” -- Ooops. No good answers!

  • 1997 Senate Bill 1 passed by Legislature

    • Regionalizes water planning in Texas and establishes surface water availability modeling

  • 2001 Senate Bill 2 passed by Legislature

    • Establishes groundwater availability modeling and initiates instream flow assessment


Improvements from senate bill 1 water modeling and planning

Improvements from Senate Bill 1:Water Modeling and Planning

  • Before Senate Bill 1, water planning was done state-wide by TWDB

  • SB1 established 14 water planning regional groups, who are now responsible for planning water supply in their area

Water Availability Modeling

(TNRCC)


Improvements from senate bill 1 digital map of texas 100k 24k

7.5'

7.5'

Improvements from Senate Bill 1:Digital Map of Texas: 100K → 24K

1° Quadrangles

1:100,000 scale

Approx. 100 maps cover Texas

7.5' Quadrangles

1:24,000 scale

4400 maps cover Texas


Improvements from senate bill 1 water availability modeling

Improvements from Senate Bill 1: Water Availability Modeling

Sulphur

Brazos

Trinity

8000 water right

locations

Colorado

23 main river

basins

Rio Grande

City of Austin

Nueces

Inform every permit holder of the

degree of reliability of their withdrawal

during drought conditions (TCEQ)


Crwr mission for senate bill 1

CRWR Mission for Senate Bill 1

  • CRWR (UT Austin) aids in the response to Senate Bill 1 by providing to TNRCC watershed parameters defined from geospatial data for each water right location

  • These data are input by TCEQ contractors to a Water Rights Assessment Package (developed at TAMU) which determines the % chance that the water will actually be available at that location

  • TCEQ sends theownerof the water right a letter specifying the availability of water


Water rights in the sulphur basin

Water Rights in the Sulphur Basin

Water right location

Stream gage location

Drainage areas delineated from

Digital Elevation Models are used to estimate flow at water right locations based on flow at stream gage locations


Digital elevation model

90

72

95

76

85

80

75

90

83

89

81

73

72

83

85

80

82

70

89

87

Digital Elevation Model

75

77

79

85

92


Topographic map of west austin 1 24 000 scale

Topographic Map of West Austin1:24,000 scale

Hog Pen Ck

4 km

4 km


Digital elevation model dem

Digital Elevation Model (DEM)

720

720

Contours

740

720

700

680

740

720

700

680


Austin west 30 meter dem

Austin West 30 Meter DEM


Water availability

Cell Size

30m

100m


Water availability

32

64

128

16

1

8

4

2

Eight Direction Pour Point Model

Water flows in the direction ofsteepest descent


Flow direction grid

32

64

128

16

1

8

4

2

Flow Direction Grid


Water availability

Stream cell

Cell to Cell Grid Network

Through the Landscape


Streams and watersheds defined from the dem

Streams and Watersheds Defined from the DEM


Comparison of drainage areas

Comparison of Drainage Areas

DEM

Difference is ~ 0.5%

USGS


Watershed properties averaged over the drainage area

Watershed Properties Averaged over the Drainage Area

+

Property grid

(CN or Precipitation)

Drainage Areas


Water availability

Connectivity of the Control Points

Neches Basin

This flow order is used in the Water Rights Analysis Package


Data products

Data Products

GIS coverages for determining

watershed parameters

Watershed parameters

as input for WRAP model

=

Analysis completed for more than

10,000 locations in all river basins

of Texas


Water availability

Ralph Wurbs

______________________________________

Professor and Division Head

Environmental and Water Resources Division

Department of Civil Engineering

Texas A&M University

College Station, Texas 77843

[email protected]

(979)845-3079


Water availability modeling in texas pursuant to 1997 senate bill 1

Water Availability Modelingin TexasPursuant to 1997 Senate Bill 1

Water Rights Analysis Package (WRAP) model developed at Texas A&M University and adopted for Texas WAM System

Water Availability Modeling (WAM) System implemented by TNRCC/TCEQ, its partner agencies, and contractors pursuant to Senate Bill 1 (SB1) enacted by the Texas Legislature in June 1997  


Internet sites

Internet Sites

  • http://ceprofs.tamu.edu/rwurbs/

    WRAP software and reference and users manuals

  • http://www.tnrcc.state.tx.us/permitting/

    waterperm/wrpa/wam.html

    TCEQ Water Availability Models


Water availability modeling process

Water Availability Modeling Process

Historical Hydrology

  • Develop sequences of naturalized monthly flows for the period-of-analysis at selected gaging stations.

  • Distribute flows from gaged sites to ungaged sites.

    Current Water Management and Use

  • Simulate a specified scenario of water management/use during an assumed repetition of historical hydrology.

  • Develop measures of water supply reliability and water availability.


Water rights analysis package wrap

Water Rights Analysis Package (WRAP)

  • Generalized model for simulating management of rivers, reservoirs, and water use in a river basin or multiple-basin region under a priority-based water allocation system.

  • Tool for evaluating hydrologic and institutional water availability.

  • Set of Fortran computer programs.


Features of wrap

Features of WRAP

  • Spatial configuration (control points)

  • Hydrologic period-of-analysis

  • Natural hydrology

  • Water management and use

  • Water availability indices


Natural hydrology

Natural Hydrology

  • Naturalized flows at gaged sites

  • Flow distribution to ungaged sites

  • Channel losses

  • Net reservoir evaporation-precipitation


Water management and use

Water Management and Use

  • Water right priorities

  • Water supply diversions

  • Return flows

  • Reservoirs

  • Multi-reservoir system operations

  • Off-channel reservoirs

  • Interbasin transfers

  • Instream flow requirements

  • Hydroelectric power


Water availability indices

Water Availability Indices

  • Volume reliability

  • Period reliability

  • Frequency relationships for storage, regulated flows, and unappropriated flows


Current wrap development efforts

Current WRAP Development Efforts

  • Daily time step features

  • Conditional reliability model

  • Salinity tracking

  • Other Continuing refinements


Observations regarding texas wam project

Observations Regarding Texas WAM Project

  • Model development is an institutional partnership effort.

  • Many people contribute.

  • Regulatory and planning functions are integrally related.

  • A modeling system is constructed rather than just a model.

  • Data management is a governing concern.

  • Model development is a process of continual expanding and improving.


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