Gma1 2 18 15 legal

Preparatory Report

GMA-1 Joint Planning CommitteeApril 11, 2014

Factors

• Factor 1 – Aquifer uses or conditions within the management area, including conditions that differ substantially from one geographic area to another.

• Factor 2 – Water Supply needs and Water Management Strategies included in the State Water Plan

• Factor 3 – Hydrological conditions, including for each aquifer in the GMA the total estimated recoverable storage as provided by the TWDB Executive Administrator, and the Average Annual Recharge , inflows and discharge.

Rita Blanca Aquifer (Cont.)

• Groundwater availability modeling combines Rita Blanca with the Ogallala Aquifer. • Below Ogallala Aquifer• Above Dockum Aquifer• Hydraulically connected to Ogallala & Dockum Aquifers.• Produces water from Undifferentiated sands & Lytle Sandstone of the Dakota Group, & Exeter Sandstone.• Source water supply for Texline

Texas Water Development Board Report 380

Rita Blanca Aquifer

Graneros Shale: Marine shale with fine grained mixed clasticsediment and limestone. (Cretaceous)Dakota Group: (Undifferentiated, GlencairnFormation & Lytle Sandstone) fine- to coarse-grained sandstone, variegated clay, and pebbly beds. (Cretaceous) Morrison Formation: mudstone, sandstone, siltstone and limestone (Jurassic)Exeter Sandstone: Coarse, evenly laminated, sandstone. (Jurassic)

Modified from Texas Water Development Board Report 380

Ogallala Aquifer

• Origin – Alluvial Fan (Braided Streams)

• Type - Unconfined (Water Table)

• Extends through 48 Counties in the Texas High Plains Area and Panhandle

• Extends throughout all 18 counties in GMA-1

TWDB GAM Task 13-025 (August 2013)


Drawdown (feet)

50 or less

300

50 or less

300

Drawdown (feet)

Total Groundwater Level Declines in the Ogallala Aquifer over the last 60 Years

County Total Storage 25% Total Storage

75% Total Storage

Armstrong 3,300,000 825,000 2,475,000Carson 16,000,000 4,000,000 12,000,000Dallam 22,000,000 5,500,000 16,500,000Donley 5,000,000 1,250,000 3,750,000Gray 13,000,000 3,250,000 9,750,000Hansford 22,000,000 5,500,000 16,500,000Hartley 27,000,000 6,750,000 20,250,000Hemphill 15,000,000 3,750,000 11,250,000Hutchinson 11,000,000 2,750,000 8,250,000Lipscomb 21,000,000 5,250,000 15,750,000Moore 12,000,000 3,000,000 9,000,000Ochiltree 21,000,000 5,250,000 15,750,000Oldham 2,600,000 650,000 1,950,000Potter 2,400,000 600,000 1,800,000Randall 6,100,000 1,525,000 4,575,000Roberts 32,000,000 8,000,000 24,000,000Sherman 20,000,000 5,000,000 15,000,000Wheeler 7,700,000 1,925,000 5,775,000Total 259,100,000 64,775,000 194,325,000

Ogallala and Rita Blanca Aquifers Total Estimated Recoverable Storage By County(Acre-feet)


Ogallala and Rita Blanca Aquifers Total Estimated Recoverable Storage By Groundwater Conservation District

(Acre-feet)

Groundwater Conservation District Total Storage 25% Total

Storage75% Total

Storage

Hemphill County UWCD 15,000,000 3,750,000 11,250,000

High Plains UWCD No. 1 4,600,000 1,150,000 3,345,000

North Plains GCD 150,000,000 37,500,000 112,500,000

Panhandle GCD 79,000,000 19,750,000 59,250,000

No District 13,000,000 3,250,000 9,750,000

Total 261,600,000 65,400,000 196,200,000


DockumAquifer

• Minor Aquifer (Confined)•Dockum Group•Type - confined•Outcrop area: 3,519 square miles•Subsurface Area: 21,992 square miles


DockumAquifer

• GMA-1 Storage 319,000,000 Acre-Feet

• DFC - average decline in water levels will decline no more than 30 feet over the next 50 years.

Source: TWDB GAM 10-19 V2

Dockum Aquifer Total Estimated Recoverable Storage By County (Acre-feet)


75% Total Storage

Armstrong 10,000,000 2,500,000 7,500,000Carson 1,800,000 450,000 1,350,000Dallam 81,000,000 20,250,000 60,750,000Hartley 93,000,000 23,250,000 69,750,000Moore 11,000,000 2,750,000 8,250,000Oldham 60,000,000 15,000,000 45,000,000Potter 14,000,000 3,500,000 10,500,000Randall 50,000,000 12,500,000 37,500,000Sherman 1,200,000 300,000 900,000

Total 322,000,000 80,500,000 241,500,000


Dockum Aquifer Total Estimated Recoverable Storage By Groundwater Conservation District

(Acre-feet)

Groundwater Conservation District Total Storage 25% Total

Storage75% Total

Storage

High Plains UWD No.1 31,000,000 7,750,000 23,250,000

North Plains GCD 170,000,000 42,500,000 127,500,000

Panhandle GCD 20,000,000 5,000,000 15,000,000

No District 98,000,000 24,500,000 73,500,000

Total 319,000,000 79,750,000 239,250,000


Blaine Aquifer• Blaine Formation (Peace River

Group) - red silty shale, gypsum, anhydrite, salt, and dolomite.

• Origin – Permian marine and nonmarine sedimentary cycles deposited in a broad, shallow sea.

• Groundwater occurs primarily in solution channels and caverns within anhydrite and gypsum.

• Saturated Thickness – 300 feet maximum, 137 feet average.

• Water quality ranges from slightly saline (1000-3000 mg-l) to moderately saline (3,000-10,000 mg-l)


Blaine Aquifer - Contour maps of groundwater elevations (feet, left) and total dissolved solids (milligrams per liter, right).


Blaine Aquifer

• Type –Confined• GMA-1 Location –

Wheeler County (Panhandle GCD)

• DFC - 50 percent of the volume in storage remaining in 50 years.

• Modeled Available Groundwater = 98,997 Acre-feet per Year

TWDB GAM Run 10-020 MAG Report(June 22, 2011)

Blaine Aquifer Total Estimated Recoverable Storage (Acre-feet)


75% Total Storage

Wheeler 6,700,000 1,675,000 5,025,000Total 6,700,000 1,675,000 5,025,000

Groundwater Conservation

DistrictTotal Storage 25% Total

Storage75% Total

Storage

Panhandle GCD 6,700,000 1,675,000 5,025,000

Total 6,700,000 1,675,000 5,025,000

Seymour Aquifer

• GMA-1 Total Storage 760 Acre-Feet

• DFC - Small and not having sufficient relevance for the GMA 1 joint planning process.


• Major Aquifer in Texas• Seymour Formation-

discontinuous beds of poorly sorted gravel, conglomerate, sand, and silty clay.

• Origin – Quaternary Alluvial sediments overlying Permian-age rocks

• Type - Unconfined (Water Table)

Seymour Aquifer


Generalized Stratigraphy of the Seymour Aquifer and Blaine Aquifer


Seymour Aquifer Total Estimated Recoverable Storage (Acre-feet)


75% Total Storage

Donley 760 190 570Total 760 190 570

Groundwater Conservation

DistrictTotal Storage 25% Total

Storage75% Total

Storage

Panhandle GCD 760 190 570

Total 760 190 570


Region A -Total DemandCounty Name 2020 2030 2040 2050 2060 2070Armstrong 5,286 5,077 4,792 4,381 3,971 3,563Carson 58,087 55,269 51,246 45,855 40,481 35,113Childress 9,620 9,381 8,992 8,303 7,624 6,945Collingsworth 19,259 18,616 17,609 15,831 14,048 12,263Dallam 376,493 354,620 326,399 291,512 256,648 221,798Donley 26,033 25,141 23,771 21,338 18,912 16,486Gray 33,028 32,992 32,153 31,495 29,986 28,620Hall 11,172 10,847 10,305 9,272 8,242 7,213Hansford 140,242 131,355 120,762 108,106 95,468 82,836Hartley 353,377 334,425 309,375 276,595 243,872 211,201Hemphill 4,574 4,191 4,090 3,982 3,871 3,758Hutchinson 71,429 70,588 68,951 66,351 64,583 62,970Lipscomb 22,607 21,198 19,840 17,960 16,078 14,194Moore 161,131 153,836 144,157 131,886 119,980 108,177Ochiltree 65,253 60,780 56,600 51,456 46,354 41,276Oldham 6,276 6,227 6,054 5,699 5,375 5,059Potter 69,373 74,223 79,446 84,517 92,868 100,989Randall 50,260 52,199 53,903 55,267 57,048 59,012Roberts 7,126 6,331 5,823 5,246 4,672 4,098Sherman 225,156 212,100 195,232 174,274 153,326 132,393Wheeler 11,409 10,938 10,363 9,568 8,783 8,002Total 1,727,191 1,650,334 1,549,863 1,418,894 1,292,190 1,165,966

Total DemandYear

Geographic Area

2010-2013 AVG

Prod.

2020 2030 2040 2050 2060 2070

1 1,376,913 1,116,157 1,054,981 975,163 874,267 773,826 673,5692 6,677 4,574 4,191 4,090 3,982 3,871 3,7583 740,088 566,409 552,318 533,704 507,239 484,579 462,218

Total 2,123678 1,687,140 1,611,490 1,512,957 1,385,488 1,262,276 1,139,545

Panhandle Regional Water Planning Group Preliminary Data for 2017 State Water Plan & District Data (Provisional Data Subject to Review)

Total Demand Compared to Ogallala and Rita Blanca Aquifers Predictive MAG Simulation

Geographic Area

Predictive MAG Simulation 2010 2020 2030 2040 2050 2060 2070

1 1,387,054 1,242,284 1,083,811 938,150 806,832 691,874 619,662 2* 45,170 41,759 42,398 42,777 42,989 43,159 39,900 3 2,234,035 2,026,120 1,885,847 1,726,720 1,568,980 1,416,370 1,284,553

Total 3,666,259 3,310,163 3,012,056 2,707,6472,418,801 2,151,403 1,942,442

Total Demand YearGeographic Area

2010-2013 AVG Prod. 2020 2030 2040 2050 2060 2070

1 1,376,913 1,116,157 1,054,981 975,163 874,267 773,826 673,5692 6,677 4,574 4,191 4,090 3,982 3,871 3,7583 740,088 566,409 552,318 533,704 507,239 484,579 462,218

Total 2,123678 1,687,140 1,611,490 1,512,957 1,385,488 1,262,276 1,139,545Panhandle Regional Water Planning Group Preliminary Data for 2017 State Water Plan & District Data (Provisional Data Subject to Review)

References• Bradley, R. and Kalaswad, S., 2003, The Groundwater Resources of the Dockum Aquifer, Texas Water

Development Board Report 359, 81 p.• George, P, Mace, R., Petrossian, R., 2011, Aquifers of Texas, Texas Water Development Board Report

380, 182 p.• Jigmond, M., 2012, GAM Run 12-005 MAG: Modeled Available Groundwater for the Ogallala Aquifer in

Groundwater Management Area 1, Texas Water Development Board GAM Run 12-005 MAG Report, 16 p.

• Joint Planning Committee, 2009, GMA1 Rita Blanca and Ogallala Aquifers Desired Future Conditions, Groundwater Management Area 1 Joint Planning Committee, 74 p.

• Joint Planning Committee, 2010, GMA1 Dockum, Blaine and Seymour Aquifers Desired Future Conditions, Groundwater Management Area 1 Joint Planning Committee, 81 p.

• Kohlrenken, W., 2013, GAM Task 13-025: Total Estimated Recoverable Storage for Aquifers in Groundwater Management Area 1, Texas Water Development Board GAM Task 13-025 Report, 20p.

• North Plains GCD In-house data (Provisional, subject to review) March 28, 2014• Oliver, W., 2010, GAM Run 10-019 Version 2, Managed available groundwater for the Dockum Aquifer

in Groundwater Management Area 1: Texas Water Development Board, GAM Run 10-019 Version 2 Report, 12p.

• Oliver, W., 2010a, GAM Run 10-020 MAG Managed available groundwater for the Blaine Aquifer in Groundwater Management Area 1: Texas Water Development Board, GAM Run 10-020 MAG Report, 9p.

• Oliver, W., 2011, GAM Run 09-026 , Managed available groundwater for the Ogallala Aquifer in Groundwater Management Area 1: Texas Water Development Board, GAM Run 09-026 Report, 20 p.

• Panhandle GCD In-house data (Provisional, subject to review) March 28, 2014• Panhandle Regional Water Planning Data for 2017 State Water Plan• Texas Water Development Board Historical Water Use Survey by County

Documents

Gma1 2 18 15 legal