2008-01-28_PERMIT FILE - C1992080A

• Permit No: C1992080A
• IBM Index Class Name: Permit File
• Doc Date: 1/28/2008
• Section_Exhibit Name: APPENDIX 5-2 SEDIMENT POND CONTROL DESIGN
• Media Type: D
• Archive: Yes

• Calculation Sheet 2 of 5
PCI Sediment Pond l/1
As Built
Calculation of Minimum Storage Volume
From equations derived from the inflow-outflow triangular hydrographs
on Figure 4.21 (Barfield, et al) determine the minimum storage volume
from equations derived from the inflow-outflow triangular hydrographs
on Figure 4.21 (Barfield, et al) determine the minimum storage volume
required to produce an average detention time (Td) of 24 hours,. Assume
sediment fill-up of pond at stage 0 or 2.5 feet.
Tpi = .464 hr.
V = .89 in.
Qpi = 1.617 in/hr.
• From Equation (c)
Tbi 2 V/Qpi = (2) (.89)/1.617
= 1.101 hr.
Tri = Tbi - Tpl 1.101 hr. - .464 hr.
_ .637 hr.
From Equation (d)
Tmi = (Tpi/3) + (Tbi/3) _ (.464 hr./3) + (1.101 hr/3)
_ .522 hr.
•