2020-03-31_PERMIT FILE - C1981019A ‎(13)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 3/31/2020
• Doc Name: Prospect Sedimentation Pond
• Type & Sequence: TR136
• Section_Exhibit Name: Exhibit 07 Item 20 Part PP
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
rnnvnnht 1 QQR AM fl Pamola I Crhwah
13
Structure #21 (Riprap Channel)
Contour ditch south
Trapezoidal Riprap Channel Inputs:
Material: Riprap
Left Right Freeboard Freeboard Freeboard
Bottom Sideslope Sideslope Slope(%)
Width (ft) Ratio Ratio Depth (ft) %of Depth Mult.x
(VxD)
12.00 2.0:1 2.0:15.0 1.00
Riprap Channel Results:
Simons/OSM Method - Steep Slope Design
w/o Freeboard w/Freeboard
Design Discharge: 21.96 cfs
Depth: 0.25 ft 1.25 ft
Top Width: 13.01 ft 17.01 ft
Velocity*:
X-Section Area: 3.16 sq ft
Hydraulic Radius: 0.241 ft
Froude Number*:
Manning's n*:
Dmin: 1.00 in
D50: 3.00 in
Dmax: 3.75 in
Velocity and Manning's n calculations may not apply for this method.
Structure #22(Null)
Collection point Subwshd G in contour ditch
Structure #23(Rprap Channel)
Contour Ditch to jct E Pit Ditch
Trapezoidal Riprap Channel Inputs:
Material: Riprap
Left Right Freeboard
Bottom Freeboard Freeboard
Sideslope Sideslope Slope(%)
Width(ft) Ratio Ratio Depth (ft) %of Depth Mult.x
(VxD)
12.00 2.0:1 2.0:1 5.0 1.00
Riprap Channel Results:
Filename: Prospect Pond 25 Yr 24 Hr Storm Event.sc4 Printed 01-06-2020