EN TU COLEGIO

BRAZOS WAM DATASET

The TCEQ WAM System dataset for the Brazos River Basin and San Jacinto-Brazos Coastal Basin is adopted as a case study to investigate, test, evaluate, and further develop the methodology outlined in the preceding Chapter 2. This case study dataset is called the Brazos WAM throughout this report. Development of the original Brazos WAM model is described by the following reports prepared by HDR Engineering, Inc. under contract with the TCEQ.

Water Availability in the Brazos River Basin and the San Jacinto-Brazos Coastal Basin,

HDR Engineering, Inc., TNRCC Contract No. 582-0-820108, December 2001.

Naturalized Flow Estimates for the Brazos River Basin and the San Jacinto-Brazos Coastal Basin, HDR Engineering, TNRCC Contract No. 582-0-820108, October 2001.

The Brazos River Basin has a total area of 44,620 square miles. The climate, hydrology, and geography of the basin varies greatly as it extends across Texas from New Mexico to the Gulf of Mexico. Mean annual precipitation varies from 19 inches in the upper basin which lies in the High Plains to 45 inches in the lower basin in the Gulf Coast region. The extreme upper end of the basin in and near New Mexico is an arid flat area that rarely contributes to stream flow.

The San Jacinto-Brazos Coastal Basin lies south of the City of Houston between the lower Brazos River Basin and Galveston Bay. This adjoining coastal basin has a watershed drainage area of 1,145 square miles and mean annual precipitation of 46.3 inches. The small streams that drain into Galveston Bay and the Gulf of Mexico include Clear Creek, Oyster Creek, and Dickinson, Mustang, Chocolate, and Bastrop Bayous.

The Brazos WAM model has 77 primary control points and a 696-month hydrologic period- of-analysis extending from January 1940 to December 1997. The authorized use and current use scenarios adopted for the WAM System are described in Chapter 1. The Brazos WAM files for the authorized use scenario (run 3) and current use scenario (run 8) have the filename roots Bwam3 and Bwam8, respectively. The Bwam3 and Bwam8 datasets used in this study were last updated by the TCEQ in August 2007. The simulation model WRAP-SIM prints a listing to its message file of the number of various system components. The data in Table 3.1 are taken from this listing for the authorized use and current use scenario models.

Table 3.1

Number of System Components in Brazos WAM Dataset

Water Use Scenario Authorized Current

Filename Bwam3 Bwam8

Last simulation input data DAT file update August 2007 August 2007

total number of control points 3,830 3,834

number of primary control points 77 77

control points with evaporation-precipitation rates 67 67

number of reservoirs 670 711

number of WR record water rights 1,634 1,725 number of instream flow IF record water rights 122 144 number of FD records in flow distribution DIS file 3,138 3,141

Control Points

Primary control points are locations at which naturalized flows are provided in a WAM input dataset. Naturalized flows at all other control points (called secondary control points) are computed within the WRAP-SIM simulation based on the naturalized flows provided at the primary control points and watershed parameters provided in a flow distribution DIS file.

The 77 primary control points for which naturalized stream flows are provided as IN records in the Bwam3.FLO and Bwam8.FLO files are listed in Table 3.2 with the six-character identifiers used in the data files. Their locations are shown in the map of Figure 3.2 and schematic of Figure 3.3. The first 73 control points listed in Table 3.2 are located in the Brazos River Basin, and the last four are in the San Jacinto-Brazos Coastal Basin.

All but three of the 77 primary control points are U.S. Geological Survey (USGS) gaging stations located on the Brazos River and its tributaries. Control point BRGM73 represents the site at which the Brazos River flows into the Gulf of Mexico. Control points SJGBC3 and SJCMC4 represent locations at which coastal basin streams flow into Galveston Bay and the Gulf of Mexico. The other 74 control points are USGS gaging stations. The USGS gage numbers and periods-of- record are included in Table 3.2 for these 74 control points. IN record naturalized flows at the gaged control points were computed by adjusting observed flows. In cases of periods of missing data during 1940-1997, gaps in the naturalized flows at gaged sites were filled in using regression.

The Bwam3.EVA and Bwam8.EVA files contain EV records with January 1940 through December 1997 sequences of monthly net reservoir surface evaporation less precipitation depths at 67 control points. The control points with EV record evaporation-precipitation depths are listed in Table 3.3. None of the EV record control points in Table 3.3 are primary control points listed in Table 3.2. The state of Texas is divided into quadrangles for purposes of compiling evaporation and precipitation data. The location of control points are indicated in Table 3.3 either by quadrangle number or by a major reservoir with its control point identifier assigned to the net evaporation data. The net evaporation-precipitation depths entered as EV records in the EVA file for these 67 control points are applied to reservoirs located at these control points and other nearby control points.

Table 3.2

Primary Control Points in the Brazos WAM Dataset

WAM Nearest USGS Watershed 1940-1997

CP ID Stream City Gage No. Area Mean Nat Flow

(sq miles) (ac-ft/year)

RWPL01 Running Water Draw Plainview 08080700 295 2,469 WRSP02 White River Reservoir Spur 08080910 689 16,730

DUGI03 Duck Creek Girard 08080950 300 10,078

SFPE04 Salt Fork Brazos River Peacock 08081000 2,007 53,686 CRJA05 Croton Creek Jayton 08081200 293 12,399 SFAS06 Salt Fork Brazos River Aspermont 08082000 2,504 77,052 BSLU07 Buffalo Spring Lake Lubbock 08079550 245 16,918 DMJU08 Double Mountain Fork Justiceburg 08079600 265 22,230 DMAS09 Double Mountain Fork Aspermont 08080500 1,891 108,367 NCKN10 North Croton Creek Knox City 08082180 250 12,941 BRSE11 Brazos River Seymour 08082500 5,996 250,096

MSMN12 Millers Creek Munday 08082700 106 5,806

CFRO13 Clear Fork Brazos Roby 08083100 266 7,221 CFHA14 Clear Fork Brazos Hawley 08083240 1,456 45,162 MUHA15 Mulberry Creek Hawley 08083245 208 7,780 CFNU16 Clear Fork Brazos Nugent 08084000 2,236 95,668 CAST17 California Creek Stamford 08084800 476 27,572 CFFG18 Clear Fork Brazos Fort Griffin 08085500 4,031 174,974 HCAL19 Hubbard Creek Albany 08086212 612 57,538 BSBR20 Big Sandy Creek Breckenridge 08086290 289 23,348 HCBR21 Hubbard Creek Breckenridge 08086500 1,092 97,181 CFEL22 Clear Fork Brazos Eliasville 08087300 5,738 308,856 BRSB23 Brazos River South Bend 08088000 13,171 656,260 GHGH24 Lake Graham Graham 08088400 224 35,827 CCIV25 Big Cedar Creek Ivan 08088450 97 13,452 SHGR26 Brazos River Graford 08088600 14,093 793,483 BRPP27 Brazos River Palo Pinto 08089000 14,309 810,380

PPSA28 Palo Pinto Creek Santo 08090500 574 64,126

BRDE29 Brazos River Dennis 08090800 15,733 1,003,749 BRGR30 Brazos River Glen Rose 08091000 16,320 1,118,978 PAGR31 Paluxy River Glen Rose 08091500 411 58,474

NRBL32 Nolan River Blum 08092000 282 67,304

Table 3.2 Continued

Primary Control Points in the Brazos WAM Dataset

WAM Nearest USGS Watershed 1940-1997

CP ID Stream City Gage No. Area Mean Nat Flow

(sq miles) (ac-ft/year)

AQAQ34 Aquilla Creek Aquilla 08093500 307 89,186 NBHI35 North Bosque River Hico 08094800 360 44,879

NBCL36 North Bosque River Clifton 08095000 977 162,919 NBVM37 North Bosque River Valley Mills 08095200 1,158 202,937 MBMG38 Middle Bosque River McGregor 08095300 77 55,164 HGCR39 Hog Creek Crawford 08095400 181 25,735 BOWA40 Bosque River Waco 08095600 1,660 356,832 BRWA41 Brazos River Waco 08096500 20,065 1,942,324 BRHB42 Brazos River Highbank 08098290 20,900 2,331,139 LEDL43 Leon River De Leon 08099100 267 56,375 SADL44 Sabana River De Leon 08099300 476 35,079 LEHS45 Leon River Hasse 08099500 1,283 141,273 LEHM46 Leon River Hamilton 08100000 1,928 166,469 LEGT47 Leon River Gatesville 08100500 2,379 257,793 COPI48 Cowhouse Creek Pidcoke 08101000 455 77,373 LEBE49 Leon River Belton 08102500 3,579 505,257 LAKE50 Lampasas River Kempner 08103800 817 119,776 LAYO51 Lampasas River Youngsport 08104000 1,240 208,870 LABE52 Lampasas River Belton 08104100 1,321 233,258 LRLR53 Little River Little River 08104500 5,266 846,554 NGGE54 North Fork San Gabriel Georgetown 08104700 248 57,922 SGGE55 South Fork San Gabriel Georgetown 08104900 132 36,173 GAGE56 San Gabriel River Georgetown 08105000 404 104,317 GALA57 San Gabriel River Laneport 08105700 737 189,268 LRCA58 Little River Cameron 08106500 7,100 1,318,302 BRBR59 Brazos River Bryan 08109000 30,016 4,027,961 MYDB60 Middle Yegua Creek Dime Box 08109700 235 39,362 EYDB61 East Yegua Creek Dime Box 08109800 239 43,189 YCSO62 Yegua Creek Somerville 08110000 1,011 223,399 DCLY63 Davidson Creek Lyons 08110100 195 47,485 NAGR64 Navasota River Groesbeck 08110325 240 83,472 BGFR65 Big Creek Freestone 08110430 97 32,237 NAEA66 Navasota River Easterly 08110500 936 322,578 NABR67 Navasota River Bryan 08111000 1,427 421,304 BRHE68 Brazos River Hempstead 08111500 34,374 5,358,943 MCBL69 Mill Creek Bellville 08111700 377 149,586 BRRI70 Brazos River Richmond 08114000 35,454 5,850,224

BGNE71 Big Creek Needville 08115000 46 25,631

BRRO72 Brazos River Rosharon 08116650 35,775 6,112,278 BRGM73 Brazos River Gulf of Mexico − 36,027 6,105,239 CLPEC1 Clear Creek Pearland 08077000 38.8 28,734

CBALC2 Chocolate Bayou Alvin 08078000 87.7 76,372

SJGBC3 Coastal Basin Galveston Bay − 415 345,148

RWPL01 WRSP02 SFAS06 BRSE11 BRSB23 SHGR26 BRPP27 BRDE29 BRGR30 BRAQ33 BRBR59 BRHE68 BRRI70 BRRO72 BRGM73 OUT BGNE71 MCBL69 NABR67 NAEA66 NAGR64 BGFR65 DCLY63 YCSO62 EYDB61 MYDB60 LEDL43 GAGE56 SGGE55 NGGE54 LAKE50 BRHB42 BRWA41 BOWA40 MBMG38 HGCR39 NBVM37 NBCL36 NBHI35 AQAQ34 PAGR31 NRBL32 PPSA28 GHGH24 CCIV25 MSMN12 CFEL22 CFFG18 CFNU16 CFHA14 CFRO13 CAST17 HCBR21 HCAL19 BSBR20 MUHA15 NCKN10 DMAS09 BSLU07 DMJU08 SFPE04 CRJA05 DUGI03 CBALC2 OUT SJGMC4 CLPEC1 SJGBC3 OUT SADL44 LEHS45 LRCA58 GALA57 LRLR53 LABE52 LAYO51 LEBE49 COPI48LEGT47 LEHM46

Table 3.3

Control Points Assigned to Reservoir Net Evaporation-Precipitation Depth Input

Control Quadrangle or Mean Rate Control Quadrangle or Mean Rate Point Major Reservoir feet/month Point Major Reservoir feet/month 366631 305 0.3216 416131 Fort Phantom Hill 0.2866 368131 306 0.3120 516231 Georgetown 0.1243 370431 405 0.3216 531131 Gibbons Creek 0.0673 368931 406 0.3053 345831 Graham 0.2473 341131 407 0.3184 515631 Granbury 0.1808 341331 408 0.2815 516331 Granger 0.1432 344801 409 0.2262 421331 Hubbard Creek 0.2557 371431 506 0.3411 415031 Kirby 0.2924 372031 507 0.3022 434531 Lake Creek 0.1611 413331 508 0.2785 347031 Leon 0.2235 220131 509 0.2364 516531 Limestone 0.1109 227031 510 0.1912 435533 Marlin City 0.1455 225331 609 0.0308 528731 Mexia 0.1480 228731 610 0.1818 344431 Millers Creek 0.2709 406331 611 0.1422 403931 Mineral Wells 0.2047 299231 710 0.1519 403131 Lake Palo Pinto 0.2183 375931 711 0.0888 410631 Pat Cleburne 0.1751 531531 712 0.0131 515531 Possum Kingdom 0.2324

401041 812 -0.0047 371131 Post 0.4469

516841 813 -0.0144 515931 Proctor 0.1734

414231 Abilene 0.2985 554032 Sandow Surface Mine 0.1354 4146P1 Alan Henry 0.3109 532531 Smithers 0.0043 527231 Alcoa 0.1354 516431 Somerville 0.0787 292531 Allen Creek 0.0392 409731 Squaw Creek 0.1768 515831 Aquilla 0.1658 417931 Stamford 0.2911 293631 Belton 0.1437 516131 Stillhouse Hollow 0.1382 532842 Brazoria 0.0512 413031 Sweetwater 0.3014 526831 Bryan Utilities 0.1011 434231 Tradinghouse Creek 0.1611 370631 Buffalo Springs 0.3104 529831 Twin oaks 0.1274 530131 Camp Creek 0.0848 231531 Waco 0.1709 421131 Cisco 0.1945 369331 White River 0.3106

421431 Daniel 0.2521 515731 Whitney 0.1709

344031 Davis 0.2913 532841 William Harris 0.0294 549231 Eagle Nest 0.0320

The 670 reservoirs in the Bwam3 dataset and 711 reservoirs in the Bwam8 dataset are each assigned 1940-1997 sequences of monthly net evaporation-precipitation depths in feet/month read from EV records in the EVA file that are connected to one of the control points listed in Table 3.3. The first 20 control points listed in Table 3.3 serve as location identifiers for the one degree quadrangles that cover the Brazos River, which are shown on the Figure 4.1 map in Chapter 4. The other control points in Table 3.3 are locations of reservoirs. The 1940-1997 means of the net monthly net evaporation-precipitation depths are shown in the table.

Reservoirs

The authorized use dataset contains 665 reservoirs with conservation storage capacities totaling 4,694,851 acre-feet (excluding flood control storage capacity). The current use dataset contains 706 reservoirs with conservation storage capacities totaling 4,023,350 acre-feet. The range in conservation storage capacity is shown in Table 3.4. The Bwam3 and Bwam8 datasets have 246 and 266 reservoirs, respectively, that have less than 50 acre-feet of storage capacity and 12 and 11 reservoirs, respectively, that each contain over 100,000 acre-feet of conservation storage capacity. Although there are numerous smaller reservoirs, most of the total reservoir storage capacity in the Brazos River Basin is contained in a relatively few large reservoirs.

The authorized reservoir storage capacities in the Bwam3 dataset are the storage capacities stated in the water right permits. For most of the reservoirs, this is the capacity at the time of construction, prior to occurrence of reservoir sedimentation. The data for some permits are updated by sediment surveys. Reservoir storage capacity is diminished over time due to accumulation of sediment. The storage capacities in the current use Bwam8 dataset includes adjustments reflecting estimated year 2000 conditions of reservoir sedimentation.

Table 3.4

Reservoirs in the Brazos WAM

Authorized Use (Bwam3) Current Use (Bwam8) Range of Conservation Number of Total Number of Total

Storage Capacity Reservoirs Capacity Reservoirs Capacity

(acre-feet) (acre-feet) (acre-feet)

less than 50 246 4,440 266 4,904 50 to 99 82 5,838 89 6,325 100 to 499 195 44,558 208 47,431 500 to 999 49 35,503 51 36,841 1,000 to 4,999 44 93,738 49 108,146 5,000 to 9,999 12 94,479 10 76,849 10,000 to 49,999 18 463,298 19 511,698 50,000 to 99,999 7 421,066 3 174,621 100,000 to 499,999 10 2,171,092 9 1,943,444 greater than 500,000 2 1,360,839 2 1,113,087 --- --- --- --- Total 665 4,694,851 706 4,023,350

Table 3.1 shows the total WRAP-SIM counts of 670 and 711 reservoirs in the Bwam3 and Bwam8 data files. Table 3.4 shows that the numbers of actual Bwam3 and Bwam8 reservoirs are 665 and 706. The difference of five reservoirs in these counts is due to subdividing Whitney and Waco Reservoirs into component reservoirs in the model to reflect multiple owners, as shown in Table 3.5. In the 670 and 711 reservoir count of Table 3.1, Whitney Reservoir is counted as three model reservoirs, and Waco Reservoir is counted as the four reservoirs shown in Table 3.5.

Table 3.5

Whitney and Waco Component Reservoirs Storage Capacity (acre-feet) Reservoir ID Bwam3 Bwam8

Whitney Reservoir WHITNY 387,024 311,998 BRA 50,000 50,000 CORWHT 199,076 199,076 Total 636,100 561,074 Waco Reservoir LKWACO 39,100 39,100 WACO2 65,000 65,000 WACO4 88,062 88,062 WACO5 14,400 14,400 Total 206,562 206,562

Sixteen Largest Reservoirs in the Brazos River Basin

The 16 reservoirs listed in Table 3.6 are the only reservoirs in the Brazos River Basin that have a combined conservation and controlled (gated) flood control storage capacity of greater than 75,000 acre-feet. There are no reservoirs of this size in the San Jacinto-Brazos Coastal Basin. These 16 reservoirs contain about 80 percent of the conservation storage capacity and 100 percent of the flood control storage capacity in the basin. Figure 3.4 is a map showing their location. Several key USGS stream gaging stations are also shown on the map.

A system of nine federal multiple-purpose reservoirs is operated by the Corps of Engineers Fort Worth District. The Brazos River Authority (BRA) has contracted for the conservation storage in the nine federal reservoirs and owns three other reservoirs. The BRA also holds a water right permit jointly with the City of Houston and TWDB for Allens Creek Reservoir which has not yet been constructed. Two other municipal water supply reservoirs and a thermal-electric power plant cooling reservoir are included in Table 3.6.

The Brazos WAM dataset contains only conservation storage capacity, not flood control. Conservation capacity is used to store water for municipal, industrial, and agricultural water supply, hydroelectric power generation, and other beneficial uses. Flood control storage capacity is maintained empty except during and immediately following flood events. Flood control pools may be controlled by gated outlet structures operated by people or may consist of surcharge storage behind ungated structures. All of the controlled (gated) flood control storage capacity in the Brazos River Basin is contained in nine reservoirs operated by the Fort Worth District of the U.S. Army Corps of Engineers. These federal reservoirs contain flood control pools that are regulated by gated outlet structures and operating rules. There are numerous other smaller flood control dams constructed by the Natural Resource Conservation Service and other entities that have ungated outlet structures. These dams are not included in the storage capacity data presented here.

The storage capacity of the flood control pools of the nine Corps of Engineers reservoirs are tabulated in Table 3.6. The bottom of flood control pool is the top of the conservation pool. Flood control operations occur whenever lake levels rise above the top of conservation pool elevation. The flood control storage capacity shown in Table 3.6 is not included in the WAM dataset.

Possum Kingdom Lake has the largest conservation storage capacity in the Brazos River Basin, and Lake Whitney has the second largest conservation storage capacity. Considering the combined total of both flood control and conservation storage capacity, Lake Whitney is the largest reservoir in the Brazos River Basin and the seventh largest reservoir in Texas. Lakes Whitney, Granbury, and Possum Kingdom are the only major storage reservoirs on the main stream of the Brazos River. All other major reservoirs in the Brazos River Basin are on tributaries.

Table 3.6

Largest Reservoirs in the Brazos River Basin

WAM Initial Conservation Capacity Flood

Reservoir Identifier Stream Impound- Bwam3 Bwam8 Control

ment (acre-feet) (acre-feet) (acre-feet)

Brazos River Authority and U.S. Army Corps of Engineers

Possum Kingdom POSDOM Brazos River 1941 724,739 552,013 − Granbury GRNBRY Brazos River 1969 155,000 132,821 − Whitney Table 3.5 Brazos River 1951 636,100 561,074 1,372,400

Aquilla AQUILA Aquilla Creek 1983 52,400 41,700 86,700

Waco Table 3.5 Bosque River 1965 206,562 206,562 553,300

Proctor PRCTOR Leon River 1963 59,400 54,702 310,100

Belton BELTON Leon River 1954 457,600 432,978 640,000

Stillhouse Hollow STLHSE Lampases R. 1968 235,700 224,279 390,660 Georgetown GRGTWN San Gabriel 1980 37,100 36,980 87,600

Granger GRNGER San Gabriel 1980 65,500 50,540 162,200

Limestone LMSTNE Navasota R. 1978 225,400 208,017 −

Somerville SMRVLE Yequa Creek 1967 160,110 154,254 337,700

Allens Creek ALLENS Allens Creek − 145,533 − −

City of Lubbock

Alan Henry ALANHN Double Mountain 1993 115,937 115,773 −

West Central Texas Municipal Water District

Hubbard Creek HUBBRD Hubbard Cr. 1962 317,750 317,750 −

Texas Utilities Services (cooling water for an electric power plant)

Squaw Creek SQWCRK Squaw Creek 1977 151,500 151,015 −

Storage Capacity Totals

Total for the 16 reservoirs listed above 3,746,331 3,240,458 3,940,660 Total of 16 reservoirs as a percentage of basin total 79.8% 80.5% 100.0% Total for the entire river basin (665 and 706 reservoirs) 4,694,851 4,023,350 3,940,660

! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . #0 #0 #0 #0 #0 #0 #0 #0 # 0 # 0 #0 #0 #0 #0 Waco Bryan Bryan Dennis Cameron Seymour Richmond Hamilton Aspermont Hempstead South Bend Gatesville Waco Belton Granger Proctor _Aquilla Whitney Granbury Limestone Somerville Georgetown Alan Henry

Hubbard Creek Possum Kingdom

Stillhouse Hollow 0 15 30 60 90 120 miles Legend ! . Gaging stations # 0 _Reservoirs Allens Creek Squaw Creek

Figure 3.4 Largest Reservoirs and Selected Gaging Stations

The Fort Worth District of the U.S. Army Corps of Engineers operates a system of nine reservoirs in the Brazos River Basin that contain a little over 40 percent of the conservation storage capacity and all of the flood control storage capacity in the basin. The federal Whitney, Aquilla, Waco, Proctor, Belton, Stillhouse Hollow, Georgetown, Granger, and Somerville Reservoirs are the only reservoirs in Table 3.6 with flood control pools. The Corps of Engineers constructed, owns, and maintains the federal multiple-purpose reservoir system and is responsible for flood control operations. However, flood control operations are not modeled in the WAM datasets.

The Brazos River Authority (BRA) has contracted for most of the conservation storage capacity in the nine federal reservoirs, and owns three other reservoir projects: Lakes Possum Kingdom (Morris Sheppard Dam), Granbury (Decordova Bend Dam), and Limestone (Sterling C. Robertson Dam). The conservation storage in Lakes Waco and Proctor are dedicated to meeting local water supply needs in the vicinity of each individual reservoir. The City of Waco holds water right permits for use of water from Lake Waco. The BRA holds permits for use of most of the water supplied by the other reservoirs. The BRA operates the reservoirs as a system to meet water supply needs in the lower Brazos River Basin and adjoining coastal basins as well as in the vicinity of the reservoirs. However, the reservoirs are modeled essentially as individual projects in the August 2007 versions of the Bwam3 and Bwam 8 datasets, without detailed consideration of multiple-reservoir system operations. The water supply reservoirs are popular for recreation use.

Hydroelectric power is generated at Whitney and Possum Kingdom Reservoirs. The Southwest Power Administration is responsible for marketing hydroelectric power generated at Lake Whitney, which it sells to the Brazos Electric Power Cooperative. The BRA sells the power generated at Possum Kingdom also to the Brazos Electric Power Cooperative. Hydropower is generated by excess flows (spills) and releases for downstream water supply diversions. The inactive pool at Lake Whitney provides dead storage for hydropower. No water rights exist specifically for hydropower at the two Brazos River reservoir/hydropower projects.

In addition to releases for water supply diversions from the lower Brazos River, Possum Kingdom and Granbury Reservoirs supply water as needed to maintain constant operating levels in Lakes Squaw Creek, Tradinghouse Creek and Lake Creek which are owned and operated by utility companies for steam-electric power plant cooling. The BRA operates a desalting water treatment plant that allows use of water from Lake Granbury to supplement the water supply for the City of Granbury and other water users in Johnson and Hood Counties. The BRA holds a water right permit to impound 50,000 acre-feet of storage in Lake Whitney between elevations 520 feet (387,024 acre-feet) and 533 feet (642,179 acre-feet) to supply a diversion of 18,336 acre-feet/year for municipal use. The BRA has a water supply contract with the Corps of Engineers for the 50,000 acre-feet of storage capacity in Lake Whitney.

Allens Creek Reservoir is a proposed BRA storage project that has not yet been constructed. The BRA, City of Houston, and Texas Water Development Board jointly hold a water right permit for the proposed project. A water right permit was initially issued to Houston Lighting and Power