Exec Summary Report_11-15-04 - Laserfiche WebLink

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Executive Summary Table ES-5 Potential Benefits and Issues of Families of Options for Resolving Supply and Demand Gaps ~ f • ~ ! e • ~ m Alluvial Aquifers ^ Potential alternative to some reservoir ^ Surface water supplies must be available storage options for recharge The recharge of alluvial aquifers through ^ Evaporation is minimized ^ Water quality may be degraded during diversion and infiltration of surface water ^ Lesser environmental impacts than recharge supplies during times of surplus surface reservoir storage ^ Water must be treated if used for potable water and extraction of groundwater during times of insufficient surface water supplies. ^ Helps maintain wetlands and riparian habitat purposes ^ Advanced water treatrnent may be required ^ Simpler permitting than reservoir storage ^ May lead to elevated water table conditions ^ Streamflows can be diverted and which could damage structures recharged without additional treatrnent ^ The recharged water will eventually return costs to the river system if not used or recaptured ^ Can use existing structures for recharge and can be unrecoverable ^ Recharge can occur with low capital and ^ May need additional wells to meet peak operating costs demands ^ Significant volumes of potential aquifer . May need storage to capture peak surface storage available water flows for recharge . Relatively high recharge rates exist . Requires a water court approval process ^ Can be used to increase and time streamflows for environmental enhancements . Can be used to augment agricultural well pumping M&I Reuse Water Rights Exchanges ^ Improves M&I reliabiliiy ^ Requires that there be sufficient exchange ^ Maximizes successive uses of water potential The exchange of legally reusable return ^ Maximizes beneficial use of water ^ Substitute supply must be suitable for flows for water diverted at a different ^ May not require additional diversion downstream water uses within the statutory location. structures or other facilities framework ^ Lesser environmental impacts than a new ^ There may be water qualiiy objections from water supply project downstream users . Implementation costs can be significantly . Must have storage to regulate year round lower than new water supply development effluent flows and meet demands during irrigation season ^ Previously unused reusable effluent historically resulted in reduced or more junior river calls controlling the river ^ River calls may become more senior, impacting all users Non-potable Reuse ^ Improves M&I reliabiliiy ^ Can be very expensive ^ Maximizes successive uses of water ^ Must have consumable effluent to reuse The capture and use of legally reusable ^ Maximizes beneficial use of water ^ Wastewater treafinent plant needs to be return flows for the irrigation of urban ^ May not require new diversion structures near irrigation demands landscapes or for industrial uses. ^ Lesser environmental impacts than a new ^ Must have storage to regulate year round water supply project effluent flows and meet demands during ^ Does not use higher qualiiy drinking water irrigation season for irrigation ^ Previously unused reusable effluent historically resulted in reduced or more junior river calls controlling the river ^ River calls may become more senior, impacting all users ^ Public acceptance of the reuse of effluent for landscape irrigation must be achieved ~~ ~J~~a Statew~itle Water Supply Inii'iative ES-34 S:\REPORT\WORD PROCESSING\REPORT\EXEC SUMMARY 11-10-04.DOC