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<br />111-6 <br /> <br />maximum stored volume of 284 acre-feet and a maximum water surface <br />rise of 2.8 feet. The minimum dam crest is, therefore, 2.8 feet above <br />the spillway crest, based on the current policy of zero freeboard <br />allowed for PMP type events. A preliminary design of the dam and <br />spillway was prepared and is presented in Volume II of this report <br />on Drawing No. HLP-2. The design includes an irrigation outlet for <br />the Harry Holmes Ditch. <br />The proposed improvements to Hidden Lake will reduce the maximum <br />water surface during the PMP type event to what the maximum water <br />surface for the 100 year storm event would be, with the current dam <br />and spillway configuration (elevation 5281.8). The improvements also <br />reduce the 100 year maximum water surface to the current normal maximum <br />water surface elevation 5280.5 (i.e. crest of the present spillway). <br />Therefore, the improvements to the dam and spillway will provide 100 <br />year storm runoff protection to the existing houses along the south <br />shore, as well as increased protection during the rare PMP type storm <br />event. <br /> <br />I <br />I <br />I 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 />