Inside This IssueDepartments8 On the Ground• WRDA 2007 water policy provisions,by Gerald E. Galloway <strong>and</strong>Ari M. Michelsen• Arizona’s groundwater savingsprogram, by Sharon B. Megdal <strong>and</strong>Taylor Shipman12 Government• Water scarcity <strong>and</strong> growthin Southern California• New Mexico mulls regulationof deep aquifers• New Mexico <strong>and</strong> Texasresolve 29-year dispute• Rio Gr<strong>and</strong>e pits Mexico versusTexas; disagreement heads to Canada• Oil shale projects could impactColorado water• EPA wastewater infrastructureneeds $202 billion• Bromate spike in Los Angelesreservoirs12 HydroFacts34 R&D• Dire predictions for ColoradoRiver reservoirs• Mussel menace update: theyseem to be thriving• Water quality impacts toshallow groundwater• Human activities linked tochanges in water resources• Coachella Valley is sinking atincreasing rates• Extreme precipitation eventslinked to global warming• Integrated energy/water modelin the works41 In PrintDamming Gr<strong>and</strong> Canyon: The 1923USGS Colorado River Expedition,reviewed by Betsy Woodhouse42 Calendar<strong>Aquifer</strong> <strong>Recharge</strong>, <strong>Storage</strong>, <strong>and</strong> <strong>Recovery</strong>In this issue we define the deliberate recharge <strong>and</strong> temporary storage of “excess”(unneeded) water in an aquifer, with the intent of recovering that water for future use,as aquifer storage <strong>and</strong> recovery (ASR). The technique is increasingly being used asa water management tool. The implementation of ASR projects varies widely in thetype of water used, method of recharge, aquifer type, <strong>and</strong> engineering of the project,as described in these feature articles. Furthermore, water quality changes resultingfrom mixing two different waters must be considered, as well as regulatory <strong>and</strong>policy constraints. And do you really get that water back? Read all about it…16 An ASR PrimerCortney C. Br<strong>and</strong>What is aquifer storage <strong>and</strong> recovery?What are its benefits <strong>and</strong> limitations?How does it work? Who is doingit? Comparing a number of ASRprojects in the <strong>Southwest</strong> illustratesthe range of objectives, watersources, aquifer types, <strong>and</strong> recharge<strong>and</strong> recovery methods utilized.18 Hydrogeology <strong>and</strong> ASR DesignGreg BushnerSite hydrology is critical to the successof an ASR project. What factors shouldbe considered in evaluating l<strong>and</strong> <strong>and</strong>water? Which data are needed todetermine site <strong>and</strong> soil suitability <strong>and</strong>ensure nondegradation of water quality?20 ASR <strong>and</strong> the “Big Picture”Cat ShrierA recent National Research Councilreport <strong>and</strong> forum identified institutionalissues that have prevented ASR frombeing more widely accepted. Althoughthe details of any project are local,some actions taken at the federal<strong>and</strong> regional levels could facilitatemore widespread use of aquifersas potential storage zones <strong>and</strong> forconjunctive water management.22 ASR from a Legal PerspectiveDenise D. FortThe regulatory structure for ASR iscomplex because the legal systemhas historically addressed waterquality issues independently of waterquantity, as it has groundwater <strong>and</strong>surface waters. Authority over aproject may also be divided betweenfederal <strong>and</strong> state governments.Publishing <strong>Southwest</strong> <strong>Hydrology</strong> furthers SAHRA’smission of promoting sustainable managementof water resources in semi-arid regions.24 Water Quality Changes DuringSubsurface <strong>Storage</strong>Peter FoxMixing of existing groundwater <strong>and</strong>introduced water in an ASR systemcan impact water quality as well as thehydraulic capacity of injection wells.What are the potential problems <strong>and</strong>methods of treatment that can be usedto prevent or mitigate these challenges?26 What About the “R” in ASR?Betsy WoodhouseAfter injecting water undergroundvia wells or letting it seep throughshallow basins, is it possible toget all that water back again whenyou need it? What is storage? Howdoes recovery actually work?28 Water Spreading in the DesertMario R. LluriaFollowing completion of the CAPaqueduct, the Salt River Project<strong>and</strong> Phoenix-area municipalitiesinvestigated in-channel rechargeas a way to preserve Arizona’sunused allocation of ColoradoRiver water. Today two rechargefacilities store almost one millionacre-feet of water annually.30 ASR in Roseville: Navigating WaterQuality IssuesChristian E. Petersen <strong>and</strong>Kenneth GlotzbachAn ASR demonstration project inRoseville, California, is improvingunderst<strong>and</strong>ing of the water qualityimplications of underground injection<strong>and</strong> recovery. Results show a five-footrise in groundwater levels, significantreductions in TDS levels, <strong>and</strong>attenuation of disinfection byproducts.This publication is supported by SAHRA (Sustainability of semi-Arid <strong>Hydrology</strong> <strong>and</strong> Riparian Areas) under the STC Program of the National Science Foundation, AgreementNo. EAR-9876800. Any opinions, findings, <strong>and</strong> conclusions or recommendations expressed in this material are those of the author(s) <strong>and</strong> do not necessarily reflect theviews of SAHRA or of the National Science Foundation. • May/June 2008 • <strong>Southwest</strong> <strong>Hydrology</strong>
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