caldwell county regional water and wastewater planning study

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viable for Caldwell County are water conservation, additional development of theCarrizo/Wilcox, the Hays/Caldwell PUA and purchase from other wholesalewater providers such as GBRA and CRWA.Water conservation is a viable option. Public education, water use restrictions andinverse water rates are tools to implement water conservation. An aggressivewater conservation program could reduce municipal water consumption from 150gallons per capita per day to as low as 120 gallons per capita per day. The amountconserved would be 3,361 ac-ft on an annual basis and the new water requiredwould be 5,071 ac-ft per year.Carrizo/Wilcox groundwater can be developed in southeast Caldwell County or inGonzales County. This is the approach taken by the Hays/ Caldwell PUA.However, uncertainty regarding the long-term availability of this water isquestionable as groundwater conservation districts adopt policies that will grantpermits for all requests for water and limit future drawdown conditions. Aregional water supply project yielding 8,432 ac-ft of water per year could bedeveloped from the Carrizo/Wilcox aquifer. However, the possibility of futurecurtailment exists if groundwater district rules require reducing consumptionwhen water table drawdown limits are reached.Purchase of water from wholesale water providers is a viable option if there iswater available. All surface water rights are currently appropriated and there areno viable strategies in the 2006 Water Plan that bring water to Caldwell County.Thus, regional development of a new conjunctive use groundwater/surface waterproject would appear to be a possible solution to meet future needs.A conjunctive use project that combines storing water ordinarily lost in excessiveflood flows with groundwater for firming up the project yield appears to be anoption for developing a water supply project to serve a region larger thanCaldwell County. It has been estimated by the Guadalupe-Blanco River AuthorityKlotz Associates Project No. 0972.000.000January 2010ES-4Caldwell County Regional Water and Wastewater Planning StudyFinal Report
that 20,000 ac-ft - 25,000 ac-ft per year could be developed out of a conjunctiveuse project with surface water diversions occurring on the Guadalupe River atGonzales (Mid-Basin Project). This water could be diverted, treated and pipedthrough Caldwell County up to Comal and Hays County. The water providers inCaldwell, Hays and Comal Counties could benefit from this project.The cost of development of water from the local Carrizo/Wilcox Aquifer to serveCaldwell County using a regional approach is estimated as $34 million includingcollection, treatment and transmission to a regional distribution point. If a total of8,432 ac-ft of water is developed by the project, the cost per ac-ft is estimated as$4,032. The estimated unit cost of treated water at the regional water deliverypoint is estimated as $3.46 per 1,000 gallons.A main distribution system to disperse treated water from the regional distributionpoint near Lockhart along US Highway 183 and State Highway 130 is estimatedas $29 million.Development cost for the Gonzales Mid-Basin Project has not been published butthe total project cost will be spread over a larger annual water yield.These water supply projects appear to be most reasonable to meet the long termneeds of Caldwell County. Other opportunities may occur in the future butmoving forward with these projects is a reasonable course of action.Wastewater treatment in Caldwell County is currently accomplished with twocentralized systems and numerous on-site sewage facilities (OSSF). As growthand densification occurs and subdivisions are constructed in the northern part ofthe county, the entities providing wastewater treatment and disposal will be facedwith using a centralized, regional approach with a limited number of plants or ade-centralized approach with numerous plants each plant having its own operatingKlotz Associates Project No. 0972.000.000January 2010ES-5Caldwell 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 16 and 17: flows without impacting environment
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
Page 66 and 67: 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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