Evaluation of Freshwater Delivery Alternatives to East Matagorda Bay: Final Report Page: 1
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Final Report - Freshwater Delivery from Colorado River to East Matagorda Bay 2015-08-14
Table of Contents
0 Executive Sum m ary...............................................................................................................................4
1 In tro d u ctio n .......................................................................................................................................... 5
1.1 Problem statem ent ....................................................................................................................... 5
1.2 Ecological Goals.............................................................................................................................7
1.3 Scope of this project .............................................................................................................. 7
2 Background and Existing Conditions................................................................................................. 8
2 .1 H y d ro lo g y ......................................................................................................................................8
2.1.1 Colorado River and M atagorda Bay ......................................................................................8
2.1.2 Coastal W atersheds .......................................................................................................... 8
2.1.3 Diversions and return flows ..................................................................................................9
2.1.4 Freshwater Inflow to East M atagorda Bay..........................................................................11
2 .2 S a lin ity .........................................................................................................................................1 4
2 .3 E c o lo g y ........................................................................................................................................1 9
2.3.1 M arsh Habitat and Aquatic Organism s ...............................................................................19
2.3.2 Benthic organism s...............................................................................................................20
3 Freshwater Inflow Influence on Habitat ......................................................................................... 21
3.1 Salinity targets, seasonality, tim ing ....................................................................................... 21
3.2 Freshw ater am ounts required to change salinity conditions ................................................. 22
3 .2 .1 E n t ire B a y ............................................................................................................................ 2 2
3 .2 .2 W e st E n d ............................................................................................................................. 2 5
3.3 Evaluation of habitat conditions based upon M BHE W eighted Usable Area .............................25
3.4 Impact of reduced inflow on Colorado River Delta and Eastern Arm of Matagorda Bay...........32
4 Freshwater Delivery Alternatives for Localized Benefits............................................................... 35
4.1 Estim ated costs for scenarios .....................................................................................................37
4.1.1 Capital Cost Sum m ary .........................................................................................................39
4.1.2 Operation and M aintenance Cost Sum m ary ......................................................................39
4.2 Perm itting Discussion..................................................................................................................42
5 Other Alternatives................................................................................................................................43
5.1 Augm ented flow pathw ays between GIW W and north side of EM B .........................................43
5.2 Southwest Cut.............................................................................................................................43
5.3 Brackish Groundw ater ................................................................................................................ 44
5.4 Alternative m arsh focus areas and freshwater destinations......................................................44
AquaStrategies I Water Planning, Science & Engineering 1
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Austin, Barney; Kennedy, Angela; Osting, Tim & Walker, Clint. Evaluation of Freshwater Delivery Alternatives to East Matagorda Bay: Final Report, report, August 26, 2015; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth838356/m1/3/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.