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<br />MWSI Project <br />Phase II Conjunctive Use Summary Report - DRAFT <br /> <br />August 22, 1995 <br /> <br />A combination of these two approaches would also be possible, In this scenario a <br />conjunctive use plan could be designed to address existing and future demands within the <br />participating groundwater area and to develop new yield for future growth outside of the <br />groundwater area, This scenario would be feasible only if the surface water supply available for <br />conjunctive use would be large enough to meet existing and future groundwater demands within <br />aquifer depletion targels while also generating additional supplies for other areas. <br /> <br />Role ofConjuDctive Use Components <br />Any conjunctive use arrangement would involve the coordinated use of several <br />"components". The primary components of a conjunctive use plan would include the following: <br /> <br />. Non-tributary Groundwater <br />. Surface Water <br />. Groundwater Recharge <br />. On-Stream Surface Storage <br />. Operational Planning <br />. Groundwater Well Field <br />Local Peaking Reservoir <br />. CollectionlDistribution Pipelines <br />. Water Treatment <br />. Surface/Groundwater System Interties <br /> <br />Each of these components is discussed conceptually in the following paragraphs, A <br />schematic of the system components is shown in Figure 4, <br /> <br />Non-tributary Groundwater <br /> <br />In a conjunctive use plan, non-tributary groundwater serves as a drought supply and is <br />reserved primarily for that purpose. Groundwater supplies are not susceptible to drought and <br />hence can be made available to meet demands when surface supply sources are not available. <br />The existing groundwater resource in the metropolitan area is enonnous, yet is also essentially <br />non-renewing. Therefore, groundwater is reserved for time of surface water shortages, <br /> <br />Surface Water <br />The most important component in a conjunctive use plan is surface water. A major <br />objective of any conjunctive use plan is to maximize the capture and use of surface water in <br />existing facilities. During times of high river flows, surface water supplies would be diverted to <br />first meet current water system demands. In a conjunctive use arrangement which includes <br />recharge, if surface supply is available in excess of demand, it would also be diverted for <br />groundwater recharge, Water stored in surface water reservoirs above predetennined drought <br />threshold levels could also be used to meet conjunctive use demands and as a recharge supply, <br /> <br />32 <br />