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Exhibit 7-23C, Table 1 <br />Sedimentation Pond Summary <br />Revision Date 1/19/18 <br />Revision No TR -118 <br />Exh. 7-23C-4 <br />SIDEHILL <br />SECTION 26 <br />SECTION 36 <br />MIDDLE <br />SECTION 25 <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND PARAMETERS: <br />Bottom Elevation <br />71550 <br />69780 <br />71050 <br />70480 <br />68550 <br />Principal Spillway Invert Elevation <br />71700 <br />69840 <br />71180 <br />sc <br />68720 <br />Emergency Spillway Invert Elevation <br />71720 <br />69860 <br />71250 <br />70660 <br />68750 <br />Top of Embankment <br />71740 <br />69910 <br />71300 <br />7071 0 <br />68800 <br />Storage Volume Below Emergency Spillway Invert (ac -ft) <br />735 <br />285 <br />523 <br />349 <br />944 <br />Storage Volume Below Principal Spillway Invert (ac -ft) <br />588 <br />212 <br />195 <br />160 <br />672 <br />Storage Volume Below Lowest Spillway Perforation (ac -ft) <br />405 <br />1 52 <br />1 37 <br />075 <br />389 <br />Principal Spillway Parameters <br />Type <br />Perf Riser <br />Perf Riser <br />Perf Riser <br />Perf Riser <br />Perf Riser <br />Riser Diameter (in) <br />180 <br />180 <br />180 <br />180 <br />180 <br />Riser Height (ft) <br />550 <br />1400 <br />10 00 <br />10 00 <br />1600 <br />Barrel Diameter (in) <br />180 <br />180 <br />240 <br />180 <br />240 <br />Elevation of Perforation(s) (ft) <br />71670 <br />69820 <br />71160 <br />70570 <br />68680 <br />Size of Perforation(s) (in) <br />30 <br />30 <br />30 <br />30 <br />30 <br />Number of Perforations <br />20 <br />20 <br />20 <br />20 <br />20 <br />Emergency Spillway Parameters <br />Type <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Diameter (in) <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />Bottom Width (ft) <br />200 <br />200 <br />20 <br />200 <br />200 <br />Length (ft) <br />400 <br />200 <br />200 <br />200 <br />200 <br />Side Slopes'z'H 1V (ft) <br />2H 1V <br />2 5H 1V <br />2 5H 1V <br />2H 1V <br />2H 1V <br />HYDROLOGIC/HYDRAULIC PARAMETERS: <br />Base Flow Rates (cfs) <br />000 <br />000 <br />000 <br />000 <br />000 <br />Storm Event <br />10 -Year, 24 -Hour <br />10 -Year, 24 -Hour <br />10 -Year, 24 -Hour <br />10 -Year, 24 -Hour <br />10 -Year, 24 -Hour <br />Precipitation (in) <br />1 80 <br />180 <br />180 <br />180 <br />180 <br />Runoff Volume (ac -ft) <br />232 <br />394 <br />1210 <br />1255 <br />1467 <br />Principal Spillway Peak Discharge (ds) <br />082 <br />1702 <br />2220 <br />1753 <br />1422 <br />Emergency Spillway Peak Discharge (ds) <br />000 <br />000 <br />000 <br />000 <br />000 <br />Peak Surface Water Stage Elevation (ft) <br />717006 <br />698295 <br />712480 <br />706546 <br />687484 <br />Storm Event <br />25 -Year, 24 -Hour <br />25 -Year, 24 -Hour <br />100 -Year, 24 -Hour <br />100 -Year, 24 -Hour <br />100 -Year, 24 -Hour <br />Precipitation (in) <br />230 <br />230 <br />270 <br />270 <br />270 <br />Runoff Volume (ac -ft) <br />470 <br />779 <br />2971 <br />3103 <br />3784 <br />Combined Spillway Peak Discharge (cfs) <br />851 <br />1702 <br />15870 <br />15740 <br />11820 <br />Peak Surface Water Stage Elevation (ft) <br />717073 <br />698424 <br />712669 <br />706773 <br />687642 <br />Pond Freeboard (ft) <br />327 <br />676 <br />331 <br />327 <br />358 <br />SEDIMENT LOADING PARAMETERS: <br />Storm Predicted Peak Settleable Concentration (mill) <br />000 <br />044 <br />898 <br />380 <br />000 <br />SEDCAD estimated Annual Sediment Loading (ac -ft) <br />061 <br />030 <br />069 <br />013 <br />052 <br />Available Sediment Storage Volume at max sediment storage EI (ac -ft) <br />405 <br />152 <br />137 <br />075 <br />389 <br />Maximum sediment storage elevation (ft) <br />71670 <br />69820 <br />71160 <br />70570 <br />68680 <br />Predicted Number of Storage Years to Gate Valve Invert <br />67 <br />1 50 <br />1 197 <br />1 56 <br />1 75 <br />Revision Date 1/19/18 <br />Revision No TR -118 <br />Exh. 7-23C-4 <br />