caldwell county regional water and wastewater planning study

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flows without impacting environmental stream flows can be considered todevelop additional surface water supplies. There is no additional “run-of-theriver”surface water available for permitting in Caldwell County.Groundwater that is suitable for use with minimal treatment is available inCaldwell County from the Carrizo-Wilcox Aquifer. Studies completed by thePlum Creek Conservation District (PCCD) estimate that about 23,000 acre-feet(ac-ft) of water per year is the sustainable yield from the Carrizo-Wilcox Aquiferfor Caldwell County. However, groundwater laws, developing groundwaterregulations and a limited amount of groundwater are creating a permitting frenzyas potential users try to secure water for their needs. Water suppliers from outsidethe county and river basin have come to the Carrizo-Wilcox Aquifer in Caldwelland Gonzales Counties as a source for inexpensive high quality water. There maybe little groundwater remaining to be permitted for increasing local demandsbecause the water has been permitted to others for use out of the county or riverbasin. According to PCCD, as of February 2009, 16,514 ac-ft per year ofgroundwater withdrawals have been permitted in Caldwell County. Other largepermits are pending.Groundwater in the Carrizo/Wilcox Aquifer in Gonzales County is also subject tointense permitting pressure. Water modeling studies in Gonzales County indicatethat a sustainable yield of about 13,600 ac-ft per year of water can be withdrawnon the east side of the county with a 100-foot drawdown and a sustainable yield ofabout 15,400 ac-ft of water can be withdrawn on the western side of the county.Permits totals of more than 15,400 ac-ft per year have been applied for on thewestern side of Gonzales County. The Gonzales County Underground WaterConservation District (GCUWCD) is refining its groundwater management planfor Gonzales County and it appears that permits will be granted with terms andconditions that curtail use when drawdown limits are reached. Pending permitapplications are for the Hays/Caldwell Public Utility Agency and the San AntonioWater System.Klotz Associates Project No. 0972.000.000January 2010ES-2Caldwell County Regional Water and Wastewater Planning StudyFinal Report
The planning horizon for this study was selected as the period through the year2040. Based on input from the Stakeholders and the State Demographer, duringthe approximate 30 year period, the population is projected to increaseapproximately 180% from 35,843 in 2008 to 100,000 in the year 2040. When aper capita demand of 150 gallons per day per person is applied, the yearly demandfor municipal water will increase from 6,164 ac-ft to 16,803 ac-ft. Addingdemands identified for mining, manufacturing, irrigation and livestock indicate atotal current demand of 8,155 ac-ft per year in 2008 increasing to 18,495 ac-ft inthe year 2040.The population and water demand projections developed and adopted for thisstudy are higher than the population and water demand values adopted for the2006 Region L Plan. The 2006 Region L Plan estimated that the year 2040population of Caldwell County would be 83,250 (compared to 100,000 adoptedfor this plan). The 2006 Region L Plan estimated the year 2040 total waterdemand for all uses would be 12,247 acre-feet per year (compared to 18,695 acrefeetdeveloped for this plan). The larger population projections result from ahigher migration rate to the county for this plan compared to the Region Lpopulation projections. The larger future water demands result from largerpopulation projections and the adoption of larger per capita consumption rates forthis plan than those adopted for the 2006 Region L Plan.Over the planning horizon, a total of 8,432 ac-ft of water supply must bedeveloped to meet projected water needs. Other types of water uses willcollectively diminish and result in no need for additional water to supply mining,manufacturing, livestock or irrigation needs.The proposed water management strategies contained in the 2006 South CentralTexas Regional Water Plan were reviewed for applicability to meet the needs ofCaldwell County. The only strategies identified in the 2006 Plan that are stillKlotz Associates Project No. 0972.000.000January 2010ES-3Caldwell County Regional Water and Wastewater Planning StudyFinal Report
Page 1 and 2: CALDWELL COUNTY REGIONAL WATERAND W
Page 4 and 5: C O N S U L T I N G E N G I N E E R
Page 18 and 19: viable for Caldwell County are wate
Page 20 and 21: parameters and needs. For purposes
Page 22 and 23: SECTION 1INTRODUCTION1.1 Background
Page 24 and 25: A Grant Application for a Regional
Page 26 and 27: 1.4 Participants and SponsorsThe Ca
Page 28 and 29: SECTION 2CALDWELLL COUNTY CHARACTER
Page 30 and 31: Construction for segments 5 and 6 o
Page 32 and 33: Watershed and Peach Creek Watershed
Page 34 and 35: 2.4 Certificates of Convenience and
Page 36 and 37: Klotz Associates Project No. 0972.0
Page 38 and 39: GRAPH 2-1Lockhart, Texas Monthly Av
Page 44 and 45: water quality in the county. Finall
Page 46 and 47: SECTION 4GROUNDWATER4.1 Groundwater
Page 48 and 49: efore 1953. Deterioration in water
Page 50 and 51: loose sand. The sand tends to be fr
Page 52 and 53: 4.3 Groundwater Conservation Distri
Page 56 and 57: support the efforts of PCCD. The di
Page 58 and 59: SECTION 5SURFACE WATER5.1 GeneralSu
Page 60 and 61: GRAPH 5-1Caldwell County Total Surf
Page 62 and 63: GRAPH 5-2TWDB- Caldwell County Hist
Page 64 and 65: SECTION 6POPULATION6.1 Population P
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GRAPH 6-1TWDB Population Projection
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GRAPH 6-3Texas State Data Center Po
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TABLE 6-2Planning Study Population
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Klotz Associates Project No. 0972.0
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7.1.2 City of LockhartThe City of L
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Neiderwald. The service area in Cal
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purchase capacity of 6.0 MGD. The a
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Lockhart. The plant is capable of d
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In 1994 GBRA began operating the Ci
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7.3.5 Sweetwater Utility, LLCSweetw
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TABLE 8-1Caldwell County - TWDB His
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Municipal water demand projections
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applicable. A “P” in the Region
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the modified TSDC Scenario 1.0, sho
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GRAPH 8-3Caldwell County Survey Res
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GRAPH 8-4Caldwell County Yearly Wat
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espectively from the information pr
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TABLE 9-6Caldwell County Projected
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10.3 United States Environmental Pr
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10.4.3 Source Water ProtectionSourc
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10.6.1 E.coli PotentialIt is estima
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TABLE 10-4Estimated Loadings from U
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The proposed GBRA Mid-Basin Project
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11.1.3 Lower Guadalupe Water Supply
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the maximum available groundwater f
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An ASR is a viable solution. Ground
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The water conservation strategy is
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SECTION 12REGIONAL WATER PLANNING12
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TABLE 12-2Caldwell County Water Sup
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12.3.2 DistributionThe water will b
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12.4 Water System Cost EstimatesVar
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300272GRAPH 13-1Caldwell County OSS
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2. The Martindale Regional Facility
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decentralized system providing sewe
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Unfortunately, the simplicity of O&
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associated costs. Efficient and fun
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14.3 Water Quality Concerns and Sou
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wastewater plant return flows. The
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14.6 Recommended Load ReductionsLoa
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14.7.2 Water Quality Development Or
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14.8.3 Vegetative Filter StripsVege
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Use constructed wetlands to capture
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14.12 Implementation Recommendation
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Type II reclaimed water is defined
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Pollutant loading to streams from e
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Future growth in Caldwell County wi
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14.12.4 OSSF Annual Inspection and
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Water Quality Monitoring Program -
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execute strategies. Local, state, a
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the environment. Funding for the pr
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the watershed organizations should
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water or groundwater to meet future
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Mid-Basin Project and associated fa
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C O N S U L T I N G E N G I N E E R
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APPENDIX B
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APPENDIX B0 / ?% '(0 ;6 ) , 6
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APPENDIX B ) ) ) B C * (
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APPENDIX B &# ! % 44' # (0 5#
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APPENDIX B # %# '(=. )1. )@. )
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State WellNumber6702902670290567029
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APPENDIX EThe tables presented in t
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APPENDIX EWaterUserGroupTABLE 7PROJ
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APPENDIX ERules of the Gonzales Cou
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APPENDIX EAVERAGE QUEEN CITY OR SPA
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Historical Water Use Summary by Cou
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Historical Water Use Summary by Gro
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UseCodePriority DatePriority Month,
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CountyName1 = Anderson 52 = Crane 1
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WRNoWRTypeWRSeqAPPENDIX GTCEQ SURFA
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APPENDIX HWATER CONSERVATION MEASUR
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APPENDIX HWater Rate StructureAn in
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APPENDIX HLeak Detection and Repair
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APPENDIX I• The cities of Kyle, L
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Management MeasureSeptic System Ins
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Outreach ActivityAgricultural Progr
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APPENDIX KWhereas the parties to th
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RESPONSE TO WRITTEN COMMENT BY JOHN
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APPENDIX MCaldwell County Regional
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APPENDIX NTEXAS WATER DEVELOPMENT B
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APPENDIX NKlotz Associates, Inc.Res
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APPENDIX NKlotz Associates Response
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