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• <br />Refer to Figure 23-24, Typical Channel Cross-Sections for the <br />configuration of this ditch. <br />Embankment Calculations <br />(a) The average pond surface area is 18,660 square feet. <br />Height from the pond bottom to sediment storage level is <br />0.76 acre-feet x 43,560 sq ft per acre/18,660 <br />sq ft 1.73 feet <br />Primary Spillway Discharge Point = 1.73 feet <br />(D) Height from pond bottom to design capacity level is <br />1.21 acre feet x 43,560 sq ft per acre/18.660 sq ft <br />= 2.82 feet <br /> <br />-• Emergency spillway - 1.0 feet higher than design <br />pond capacity level = 1.00 feet <br />Height from pond bottom to Emergency Spillway = 3.82 feet <br />(c) Design flow level of emergency spillway = 0.78 feet <br />Required height from flow lever to dam crest = 3.82 feet <br />Height from pond bottom to Emergency Spillway = 3.82 feet <br />70TA1. EMBAH109EH7 HEIGHT = 5,60 feet <br />(d) Minimum top width of embankment = <br />H + 35/5: H = 5.60 ft, 5.60 + 35/5 = 8.1 feet <br />L <br />Detailed cross sections of the embankment are found in Figure 23-27. <br />Typical Sedimentation Pond Cross-Section. <br />Sediment will be removed from the sedimentation pond when the vol~nne of <br />sediment accumu]ates to not greater than 60 percent of the design <br />sediment storage volume. Generally the pond will be cleaned during the <br />fall when the water levels are lowest and the least amount of <br />23-168 <br />