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• Spillways <br />Sed Lmen[ Pond 006 has two separate spillways; a principal and an emergency. Please see <br />Exhibit 13-6 for location and design of spillways. The pri nclpal spillway consists of a <br />4-inch diameter dewatering orifice cut Snto a 24" diameter drop inlet corrugated metal <br />pipe (CMPI with trash scceen. Maximum elevation (peak stage) with the passage of the 10- <br />year, 29-hour event will be 7070.7, this leaves 0.1 feet to the emergency spillway crest. <br />The emergency spillway consists of riprapped traps zoldal channel. Assuming the principal <br />spillway pipe was plugged, the trapezoidal channel could safely pass the runoff volume <br />from the 100-year, 24-hour storm. Peak stage elevation with the passage of the 100-year <br />storm is 7073.3, this leaves 5.5 feet of freeboard to the top of embankment. Please refer <br />i <br />to Addendum 1 for capacities of both spillways during passage of the 10 and 100-year storm <br />events. Table 13-4C-3 and Addendum 2 presents the design calculations for the principal <br />and emergency spillway. <br />TABLE 13-4C-3 <br />As-Built <br />Principal and Emergency Spillway Data Summary <br />• Sediment Pond 006 <br />Principal Spillway: <br />Type <br />Inlet Eleya tlon <br />Length <br />Diameter <br />Slope <br />10-year, 29-houc Peak Stage <br /> Eme rgency Spillway: <br /> Type <br /> Bottom Width <br /> Length <br /> Side Slopes <br />• Outfall Slope <br />Drop Inlet (CMP) with a 4-loch <br />dewatering orifice <br />7068.0 <br />145 feet <br />24 inches (4" orifice) <br />2.58 <br />7070.7 <br />Trapezoidal Channel <br />15 feet <br />50 feet <br />3H:1V <br />15- <br />7 Revised 09/28/95 <br />