1. Alternative Water Supplies in Texas Central Texas Water Conservation Symposium Jorge A. Arroyo, PE Water Management Consultant February 2014

2. ALTERNATIVE…. TO WHAT? …WHEN IS AN ALTERNATIVE NO LONGER AN ALTERNATIVE?

3. NOT AN ALTERNATIVE TO WATER CONSERVATION

4. Alternative Water Supplies Rain collection systems Water reuse Managed aquifer recharge Desalination

5. Rain Collection Systems Source: Texas Water Development Board

6. Rain Collection Systems: Sole Source Volume of rain Water use Storage Treatment Operation and maintenance Kight Residence RWH System- Boerne Source: Texas Water Development Board

7. Rainwater Harvesting Indoor demand Irrigation Total demand Average rainfall Collection surface size Gallons/ft 2 collection coefficient Efficiency factor Rainfall collected (85% efficiency) End of month storage (*) January3,0000.03,0002.122,5000.620.852,7920 February3,0000.03,0002.412,5000.620.853,1790 March3,000150.03,1502.232,5000.620.852,9410 April3,000150.03,1502.972,5000.620.853,907519 May3,000150.03,1504.022,5000.620.855,2942,664 June3,000150.03,1503.392,5000.620.854,4603,974 July3,000150.03,1501.962,5000.620.852,5783,402 August3,000150.03,1502.212,5000.620.852,9073,159 September3,000150.03,1503.172,5000.620.854,1754,184 October3,000150.03,1503.442,5000.620.854,5285,562 November3,0000.03,0002.682,5000.620.853,5366,099 December3,0000.03,0002.352,5000.620.853,0996,198 (*) starting with water in storage RWH System Sizing Calculator http://www.twdb.texas.gov/innovativewater/rainwater/resources.asp

8. Rain Collection Systems – Institutional Redbud Center - Lower Colorado River Authority, Austin Source: Texas Water Development Board

9. Rain Collection Systems: Subdivision Subdivision-Scale Rainwater Harvesting Systems as a Water Supply Strategy – The Meadows Center for Water and the Environment: Texas State University, San Marcos – Feasibility, facility design and management protocol, backup supply – Texas Hill Country.

10. Indirect Water Reuse

11. Direct Water Reuse

12. 2012 State Water Plan Recommended Water Management Strategies 12

13. Reuse to be added in the next 17 years* 13 * 2012 State Water Plan-DB12

14. Managed Aquifer Recharge

15. Aquifer Storage and Recovery In operation Kerrville El Paso* San Antonio Potential Eastern Kerr County New Braunfels Guadalupe Blanco River Authority (Lulling) Barton Springs Edwards Aquifer District Legislation filed to facilitate ASR projects 83 rd Texas Legislature – HB 3013

16. Desalination of Ocean and Brackish Groundwater Sources 367 miles of coastline Availability of sites Proximity to demand centers Texas has an estimated 2.7 billion acre-feet of brackish groundwater

17. Saline Water Desalinated Water Concentrate and power

18. Brackish Groundwater Desalination 18

19. 120 million gallons per day 44 facilities [25,000 gpd or more] El Pasos Kay Bailey Hutchison Brackish Groundwater Desalination: 27.5 MGD

21. Innovation in water supply Increase water supply efficiency Sustainable use of sources Cost of innovation – Research – Demonstration Jorge A. Arroyo Water Management Consultant jarroyo@austin.rr.com 512-497-0474 Jorge A. Arroyo Water Management Consultant jarroyo@austin.rr.com 512-497-0474