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satisfy Rule 4.05.9(7), requiring that the combination of the inslopes and outslopes of pond embankment not be <br />steeper than 5H:1 V. <br />The drop inlet has two main features: barrel and riser. The elevation of risers for all of three ponds is slightly <br />higher (0.2 feet) than the 10 -year, 24 -hour peak water surface elevation in order to contain a 10 -year, 24 -hour <br />precipitation without discharge. The riser elevation for three ponds is 5682.5', 5682.7' and 5693.2' for NHN -001, <br />NHN -002 and NHN -003, respectively as shown in Table 3. <br />All pond design details can be found in the Appendix 2.05.3(4) -2 in SEDCAD output format. <br />Table 3: Pond Design Parameters. <br />*Note the 25 year, 24 hour peak water surface elevation assumes the proposed emergency spillway below. <br />Pond <br />Name <br />Contributi <br />Volume (acre -ft) <br />Pond <br />Sediment <br />Dewater <br />Principal <br />10 -year 24 <br />hour Peak <br />25 -year 24 hour <br />Pond <br />on Area <br />Pond Top <br />Bottom <br />Storage <br />Invert Elev. <br />Spillway <br />Water <br />Peak Water <br />Name <br />(acre) <br />Elev. (ft) <br />Elev. (ft) <br />Elev. (ft) <br />(ft) <br />Riser Elev. <br />Surface <br />Surface <br />7.32 <br />27% <br />-002 <br />5683 <br />8.50 <br />7.05 <br />(ft) <br />Elevation (ft) <br />Elevation (ft) <br />NHN -001 <br />114.9 <br />5685 <br />5675.5 <br />5676.0 <br />5676.6 <br />5682.5 <br />5682.3 <br />5683.7 <br />NHN -002 <br />72.4 <br />5685 <br />5675.0 <br />5675.4 <br />5676.0 <br />5682.7 <br />5682.5 <br />5683.7 <br />NHN -003 <br />76.7 <br />5695 <br />5685.0 <br />5685.3 <br />5686.0 <br />5693.2 <br />5693.0 <br />5694.0 <br />*Note the 25 year, 24 hour peak water surface elevation assumes the proposed emergency spillway below. <br />Pond <br />Name <br />Proposed <br />Emergency <br />Spillway <br />Elev. ft <br />() <br />Volume (acre -ft) <br />Total <br />Required <br />Volume <br />(acre -ft) <br />% Excess <br />Volume <br />Design <br />Capacity <br />p Y <br />Runoff <br />Sediment <br />Storage <br />9 <br />NHN <br />5683.5 <br />15.40 <br />10.92 <br />0.77 <br />11.69 <br />32% <br />-001 <br />5683 <br />14.18 <br />10.92 <br />0.77 <br />11.69 <br />21% <br />NHN <br />5683.5 <br />9.26 <br />7.05 <br />0.27 <br />7.32 <br />27% <br />-002 <br />5683 <br />8.50 <br />7.05 <br />0.27 <br />7.32 <br />16% <br />NHN <br />5693.5 <br />9.64 <br />7.55 <br />0.29 <br />7.84 <br />23% <br />-003 <br />5693 <br />8.95 <br />7.55 <br />0.29 <br />7.84 <br />F 14% <br />Construction Materials and Safety Factors <br />7 <br />