Texas Central Texas Water Conservation Symposium Jorge A Arroyo PE Water Management Consultant February 2014 Alternative To what When is an alternative no longer an alternative ID: 597038
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Slide1
Alternative Water Supplies in Texas
Central
Texas
Water Conservation
Symposium
Jorge
A. Arroyo, PE
Water Management Consultant
February 2014Slide2
Alternative…. To what?
…
When is an alternative no longer an alternative?Slide3
Not an alternative to water conservationSlide4
Alternative Water Supplies
Rain collection systems
Water reuseManaged aquifer rechargeDesalinationSlide5
Rain Collection Systems
Source: Texas Water Development BoardSlide6
Rain Collection Systems: Sole Source
Volume of rain
Water useStorageTreatmentOperation and maintenance
Kight Residence RWH System- BoerneSource: Texas Water Development BoardSlide7
Rainwater Harvesting
Indoor demand
IrrigationTotal demandAverage rainfallCollection surface sizeGallons/ft2 collection coefficientEfficiency factorRainfall collected (85% efficiency)End of month storage (*)January3,0000.03,0002.122,5000.620.852,7920February3,0000.03,0002.412,5000.620.853,1790March3,000150.03,1502.232,5000.620.85
2,9410April3,000150.03,1502.972,5000.620.853,907519May3,000150.03,1504.022,5000.620.855,2942,664June3,000150.03,1503.392,5000.620.854,4603,974July3,000150.03,1501.962,5000.620.852,578
3,402August3,000150.03,1502.212,5000.620.852,9073,159September3,000150.03,1503.172,5000.620.854,1754,184October3,000150.03,1503.442,5000.620.854,5285,562November3,0000.03,0002.682,5000.620.853,536
6,099December3,0000.03,0002.352,5000.620.853,0996,198Change to fit your conditionsCatchment Area (sq. ft.)2,500Monthly Indoor Demand (gals)3,000Outdoor Demand (gals)150Water in Storage to Begin (gal)0Tank Size (gal)10,000(*) starting with water in storageRWH System Sizing Calculatorhttp://www.twdb.texas.gov/innovativewater/rainwater/resources.asp Slide8
Rain Collection Systems – Institutional
Redbud Center - Lower Colorado River Authority, Austin
Source: Texas Water Development BoardSlide9
Rain Collection Systems: Subdivision
Subdivision-Scale Rainwater Harvesting Systems as a Water Supply
StrategyThe Meadows Center for Water and the Environment: Texas State University, San MarcosFeasibility, facility design and management protocol,
backup supply Texas Hill Country.Slide10
Indirect Water ReuseSlide11
Direct Water ReuseSlide12
2012 State Water PlanRecommended Water Management Strategies
12Slide13
Reuse to be added in the next 17 years*
13
Region
2010 decade2020 decadeC 1,937 229,825 E - 4,312 F - 12,380 G 18,723 21,610 H 168 33,813 I - 2,872 K 54,311 8,765 L 21,666 4,380 M 3,537 7,474 N 250 - O - 2,240 Total 100,592 327,671 * 2012 State Water Plan-DB12Slide14
Managed Aquifer RechargeSlide15
Aquifer Storage and Recovery
In operation
KerrvilleEl Paso*
San AntonioPotentialEastern Kerr CountyNew BraunfelsGuadalupe Blanco River Authority (Lulling)Barton Springs Edwards Aquifer DistrictLegislation filed to facilitate ASR projects83rd Texas Legislature – HB 3013Slide16
Desalination of Ocean and Brackish Groundwater Sources
367 miles of coastline
Availability of sites
Proximity to demand centersTexas has an estimated 2.7 billion acre-feet of brackish groundwaterSlide17
Saline Water
Desalinated Water
Concentrate and powerSlide18
Brackish Groundwater Desalination
18Slide19
120 million gallons per day
44 facilities [25,000 gpd or more]
El Paso’s Kay Bailey Hutchison Brackish Groundwater Desalination: 27.5 MGDSlide20Slide21
Innovation in water supply
Increase water supply efficiency
Sustainable use of sourcesCost of innovationResearchDemonstration
Jorge A. ArroyoWater Management Consultantjarroyo@austin.rr.com512-497-0474