SAWS Aquifer Storage & Recovery Activities
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1 2011 Drought: SAWS Aquifer Storage & Recovery Activities Capital Improvements Advisory Committee Darren Thompson Manager / Water Resources Edwards Activities
2 Outline Page 2 Drought Conditions How does this drought compare? Rainfall: historic perspective Future Outlook What is an Aquifer Storage & Recovery? Why an ASR in San Antonio? SAWS Implementation of ASR Twin Oaks ASR Activities Storage over Time 2011
3 Page Drought Widespread, d Intense, Record-Breaking August 18, 2009 October 25, 2011
4 Page Annual Rainfall Totals Inch hes Through Oct. 27th Annual Totals Normal Precip Year Note all values are in inches Source: National Weather Service Driest in Recent History y( (so far )
5 Page 5 Comparison to Selected Past Dry Years In nches More Recent Dry Years Apex of "Drought of Record" Driest Year of Instrumental Through Record Oct Rainfall for Selected Dry Years Year Normal Rainfall Note - all values are in inches Source: National Weather Service & Drier Than Most Droughts
6 Page 6
7 Page 7 Outlook: Not Promising This past year we had an unusual drought And we have a strong possibility of it continuing. Texas A&M professor of meteorology and state climatologist Dr. John Nielsen-Gammon. El Nino La Nina The majority of ENSO models predict the continuation of La Niña through the Northern Hemisphere winter La Nina conditions to continue and strengthen through the Northern Hemisphere spring of National Oceanic and Atmospheric Administration
8 Page 8 SAWS Aquifer Storage and Recovery
9 Page 9 What is Aquifer Storage and Recovery? Pumping or injection of water supplies into aquifer formations that store water long term until such time that it is needed to meet peak needs, long-term growth or emergency conditions.
10 Page 10 Why an ASR in San Antonio? Usage of Edwards Aquifer limited in 1990s: Alternative water supplies were needed to meet demands. Feasibility Studies: Completed in 1998, found that ASR was a viable strategy in our water resource management. No Roll-Over Water! Most water resources are permitted and managed on an annual basis and during wet periods there is no method to store allocations that we do not use The nearby Carrizo/Wilcox aquifer is suitable for long term storage.
11 SAWS Implementation of ASR Original Concept: Seasonal Storage Page 11 Monthly Demand ASR Recovery ASR Storage Annual Average Demand ASR Storage J F M A M J J A S O N Months D
12 Page 12 SAWS Implementation of ASR The Storage Zone Carrizo-Wilcox Aquifer
13 Page 13
14 Page 14 Historic Twin Oaks Aquifer Storage 120, ,000 83,596 AF In Storage 10/20/ Drought 80,000 t Stored 60, , Drought Drought Acre-Fee 20,000 0 Feb-11 Jun-11 Oct-04 Feb-05 Jun-05 Oct-05 Feb-06 Jun-06 Oct-06 Feb-07 Jun-07 Oct-07 Feb-08 Jun-08 Oct-08 Feb-09 Jun-09 Oct-09 Feb-10 Jun-10 Oct-10
15 Productive Activity: Annual Volumes By Type Page 15 30, ,000 25,539 Acre-Fee t 20,000 15,000 10,000 5, ,580 17,029 13,399 11,680 12,315 9,096 7,528 6,460 4,791 5,934 5, ,313 1,429 1, Recovery Recharge Local Carrizo Pumpage
16 Perspective H h water t iis in i ASR? How much Page 16
17 300.0 Edwards Demand Reduction Relating to ASR Management Page ons Begin Begin L. Carrizo ASR Recovery + ASR Recovery Precipit Million-gall ation (Inche es) Date Edwards Produced if ASR Wasn't Used... Edwards Actually Produced Precip p( (in)
18 2011 Drought: SAWS Aquifer Storage & Recovery Activities Capital Improvements Advisory Committee Darren Thompson Manager / Water Resources Edwards Activities
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