PERMFILE72269

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 08f CYCC Pond B - Stage Storage - Estimated
• Media Type: D
• Archive: No

~mruarY 7000 Clp.,rt Tuzngmi/e'PonJB EnnGmdon

•
Table 1.5
POND B SUMMARY
Pond B
WATERSHED AREA (acres):
Disturbed 24.1
Pond 0.7
Total Area 24.6
POND PARAMETERS:
Bottom Elevation 6,862.0
Spillway Invert Elevation (bottom of flume) 6,866.3 /
Top of Embankment 6,870.0
Permanent Water Level 6,866.3 /
Storage Volume Below Spillway (ac-tt) 1.58
(trapezoidal section)
Spillway Parameters:
Type: Combination Open Notch w/ Flume
Flume Parameters:
Height (fl) 1.1
Width (in) 3
'~
Invert elevation 6,866.3
Trapezoidal Channel Parameters:
Bottom Width (ft) 8
Side Slopes'z'H:1V (ft) 3
Invert Elevation 6,867.4 t/
HYDROLOGIC/HYDRAULIC PARAMETERS:
10-Year, 24-Hour Storm Event:
Precipitation (in) 1.8
RunoN Volume (ac-tt) 1.5 /
Spillway Peak Discharge (cfs) 2.4 /
Peak Surface Water Stage Elevation (ft) 6,867.5 .
25-Year, 24-Hour Storm Event:
Precipitation (in) 2.1
Runoff Volume (ac-tt) 1.9
Spillway Peak Discharge (cfs) 5.0
Peak Surface Water Stage Elevation (ft) 6,867.7
Pond Freeboard (ft) 2.3
SEDIMENT LOADING PARAMETERS:
Storm Predicted Peak Settleable Concentration (ml/I) 0.00
Predicted Annual Sediment Loading (ac-ft) 0.19
Available Sediment Storage Volume (ac-ft) 0.94
Maximum Sediment Storage Elevation (ft) 6,866.1
Predicted Number of Storage Years 5
Montgomery Watson t,fining Group ' IGS $. Union Boulevard, Sui tc -110 'Lakewood, Colorado 80228 • (i0]) 7G3-S1A0