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OUTLET DESIGNS <br />As shown in Attachment C, a 24-inch riser serves as .the emergency <br />outlet and is designed to accommodate the peak discharge from a <br />25 year, 24 hour precipitation event. The structure is capable <br />of discharging flows of 10 cfs with less than 1 ft. rise in head- <br />water depth above the invert of the spillway. <br />The principle outlet is through a gate valve located on the <br />spillway riser above the sediment storage volume as shown in <br />Attachment C. The structure is capable of discharging flows as <br />high as 4 cfs without overtopping the spillway riser. <br />OPERATING PROCEDURES <br />Prior to obtaining a discharge permit, a 15 inch pipe with an <br />invert elevation at 6112 ft. will be placed at the southwest <br />corner of the pond. The pipe will <br />south of the office building. This <br />which empties into pond MB-2 (see <br />capable of handling a flow of 6 <br />spillway and will automatically der <br />of 6112 ft. <br />drain to a ditch immediately <br />ditch will flow to a culvert <br />Attachment B). The pipe is <br />cfs without overtopping the <br />later to the invert elevation <br />Once permission is obtained to discharge directly from the pond, <br />the gate valve on the riser will be operated manually when WECC's <br />water rights are in priority. <br />When there is a call on water, the gate valve will be opened so <br />that dewatering occurs automatically within 36 hrs. In order to <br />dewater within 36 hrs.. the gate valve shall be opened to allow a <br />discharge of at least 0.23 cfs with water levels below the invert <br />of the spillway. The setting of the gate valve far automatic <br />dewatering shall be determined with field trials during manual <br />dewatering. <br />D-8 <br />