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<br />I <br />I <br /> <br />SP I1LWA Y <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />In the 1975 report a hydrology analysis was completed for determin- <br />ation of the spillway size. The drainage basin above Reservoir No. <br />15 is relatively small resulting 1n the fact that a Maximum Probable <br />Storm runoff could be stored within 5 feet of freeboard above the <br />normal high waterline. The hydrology study as completed in 1975 <br />included a routing through the existing 50 foot wide spillway re- <br />sulting 1n an surcharge depth of 3.7 feet for the Probable Maximum <br />Flood. This hydrology analysis is reproduced in its entirity in <br />Appendix "E" of this report. <br /> <br />I <br /> <br />It is anticipated that the existing spillway will be utilized with <br />some improvements to provide for a concrete overflow pan and cut- <br />off wall to specifically set the spillway configuration. <br /> <br />I <br />I <br /> <br />STRUCTURE PLANS <br /> <br />I <br /> <br />In the Engineering portion of this report, included in Appendix "F", <br />are incorporated preliminary sketchs of the existing and proposed <br />facilities as anticipated for this improvement project. These 1n- <br />clude plan and profile of the emankment and spillway, typical <br />cross-sections of the embankment, and a sketch of the proposed new <br />outlet works were it selected as the alternative. <br /> <br />I <br />I <br /> <br />DRAINAGE <br /> <br />I <br />I <br />I <br />I <br /> <br />Although seepage may result from this facility, the remoteness of <br />Reservoir No. 15 results in no apparent harm done from the seepage <br />below the dam. These flows enter Dry Creek and continue on through <br /> <br />rural areas. <br /> <br />SEDIMENTATION <br /> <br />I <br />I <br /> <br />Reservoir No. 15 has existed on this site Slnce 1909. It is es- <br />timated that in that time sedimentation has occured to the depth <br />of approximately 4 feet immediately in front of the inlet to the <br /> <br />14 <br /> <br />^ <br />