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
rnn,r nht 100A-9M fl Pamela I Crhwah
23
Stability Stability Capacity Capacity
Class D w/o Class D w/ Class B w/o Class B w/
Freeboard Freeboard Freeboard Freeboard
Design Discharge: 8.97 cfs ! 8.97 cfs
Depth: 0.29 ft 1.29 ft 0.56 ft 1.56 ft
Top Width: 13.76 ft 19.76 ft 15.37 ft 21.37 ft
-- -
Velocity:
2.38 fps
— 1 - - - -
s 1.17 fps
X-Section Area: 3.77 sqft 7.69 sq ft
Hydraulic Radius: 0.272 ft 0.494 ft
Froude Number: 0.80 0.29
Roughness Coefficient: 0.0666 0.2019
Structure #3(Null)
Start rock lined N Trib Ditch
Structure #4(Riprap Channel)
Sta 34+53 to 27, incl Subwshd N
Trapezoidal Riprap Channel Inputs:
Material: Riprap
Bottom Left Right Freeboard Freeboard Freeboard
Width (ft) Sideslope Sideslope Slope(%) Depth(ft) %of Depth Mult.x
Ratio Ratio (VxD)
12.00 2.0:1 2.0:1 10.3 1.00
Riprap Channel Results:
Simons/OSM Method - Steep Slope Design
w/o Freeboard w/Freeboard
Design Discharge: 21.29 cfs
Depth: 0.19 ft 1.19 ft
Top Width: 12.74 ft 16.74 ft
Velocity*:
X-Section Area: 2.30 sq ft
Hydraulic Radius: 0.179 ft
Froude Number*:
Manning's n*:
Dmin: 2.00 in
D50: 6.00 in
Dmax: 7.50 in
Velocity and Manning's n calculations may not apply for this method.
Filename. Prospect Pond 25 Yr 24 Hr Storm Event.sc4 Printed 01-06-2020