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rllrq 1999 Gpnu Tmrnpmde "Pond D EraGrulruu 1 b Table ].5. ,~ls shown on the SEDC.ID 4 printouts, Pond D has a total volume (up to the invert of the emergency spilhvay-) of 32 acre-feet. Most of the pond is incised. The structural nature of the Pond was not evaluated as part of this report. • • Table 1.5 POND D SUMMARY Pond D WATERSHED AREA (acres): Disturbed 88.0 Reclaimed 802.0 Total Area 890.0 POND PARAMETERS: Bottom Elevation 6,840.4 Principal Spillway Invert Elevation 6,850.4 Emergency Spillway Invert Elevation 6,853.0 Top of Embankment 6,855.0 Permanent W ater Level 6,847.4 Storage Volume Below Emergency Spillway (ac-ft) 32.0 Storage Volume Below Principal Spillway (ac-ft) 20.2 (Invert of Riser) Principal Spillway Parameters: Type: Pertorated Riser Riser Diameter (in) 24 Riser Height (in) 6.6 Barrel Diameter (in) 18 Number of Holes in Riser 4 Size of Holes (in) 4 Elev. Of Holes 6,847.10 6.849.20 Emergency Spillway Parameters: Type Trapezoidal Bottom Width (ft) 90 Side Slopes'z'H:1V (ft) 3 HYDROLOGIC/HYDRAULIC PARAMETERS: 10-Year, 24-Hour Storm Event: Precipitation (in) 1.8 Runoff Volume (ac-tt) 24.90 Principal Spillway Peak Discharge (cfs) 9.9 Emergency Spillway Peak Discharge (cfs) 0 Peak Surface Water Stage Elevation (tt) 6,651.1 25-Year, 24-Hour Storm Event: Precipitation (in) 2.1 Runoff Volume (ac-tt) 37.7 Principal Spillway Peak Discharge (c(s) 15.3 Emergency Spillway Peak Discharge (cfs) 0 Peak Surface W ater Stage Elevation (tt) 6,852.3 Pond Freeboard (tt) 2.7 SEDIMENT LOADING PARAMETERS: Storm Predicted Peak Settlable Concentration (ml/I) 0.00 Predicted Annual Sediment Loading (ac-ft) 2.49 Available Sediment Storage Volume (ac-tt) 9.14 Maximum Sediment Storage Elevation (ft) 6,847.1 Predicted Number of Storage Years 3.7 C`lontgomen' lt'atsnn dining Group ' 1G~ S. Croon Bouler'ard, Suite -{10 • Lakewood, Colorado 80?3R' (303) 7G3-51-0U D-10