Agenda - Council - 07/28/2015 - Laserfiche WebLink

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32 Table 1 - Summary of water supply sources in the Twin Cities metro area, including key management considerations; the estimated amount of water sustainably available from sources in areas where infrastructure currently exists; or, in the case of stormwater, has current support for implementation and the number of municipal water supply systems currently supplied by each source. Source & Management Considerations Quaternary Aquifer • Challenging to identify the most productive sand and g layers • First aquifer to experience changes in recharge quantit and quality • Most likely of all aquifer to be connected to surface wat • Treatment needs for naturally and manmade contamin varies across region • Response to recharge may change as climate and land changes • Funding challenges may include project phasing opportunities, eligibility for funding sources, partnershi etc Prairie du Chien -Jordan Aquifer • Not available to some growing communities • As the most heavily used aquifer in parts of the region, greater likelihood of water use conflict • Connected to some protected surface waters • Treatment needs for naturally and manmade contamin varies across region • Response to recharge may change as climate and land changes • Funding challenges may include project phasing opportunities, eligibility for funding sources, partnershi etc Tunnel City-Wonewoc Aquifer • Productivity varies greatly across the region and is high where it is fractured or weathered • Connected to some protected surface waters • Treatment needs for naturally and manmade contamin varies across region • Low recharge rate in parts of the region, response to recharge may change with climate and land use WATER SUPPLY MASTER PLAN- Draft June 2015 Estimated sustainable amount available Number of municipal water supply systems currently supplied by this source 'avel ers tion use )s, About 70-90 MGD 24 tion use )s, About 280-330 MGD 83 est tion About 70-90 MGD 30