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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />treatment plant would be obtained by drawing down the storage reservoir. Thus, proposed fill <br />and drain piping and pumps have been sized to accommodate 100 gpm flows to storage. <br /> <br />RAW WATER STORAGE <br /> <br />The storage volume necessary for a three-month raw water supply at the consumption rates <br />detailed above and assuming no evaporative losses is 20 acre-feet. This value was used as a <br />starting point for evaluating possible storage alternatives. <br /> <br />All reservoir concepts were evaluated using the end-area method to quantify the amount of <br />earthwork required. <br /> <br />Reservoir designs are to be consistent with guidance and regulations from the State Engineer's <br />Office, since it is expected that all of the altemative dams considered will be jurisdictional dams. <br />This will need to be kept in mind as the District proceeds into preliminary design of the selected <br />alternate. The size of the drainage areas and probable Size and Hazard Class were considered <br />and used to conservatively cost emergency spillways and outlet structures for the concept-level <br />dams developed for this Planning Document. <br /> <br />Further design of the selected alternative will also need to address all applicable laws and <br />regulations. For example, some of the alternates evaluated will likely involve obtaining a (404) <br />permit from the Army Corps of Engineers because of the presence of wetlands. <br /> <br />3 <br />