2023-08-17_PERMIT FILE - C1981019

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 8/17/2023
• Doc Name: East Taylor Pond & Permanent Channels
• Section_Exhibit Name: Exhibit 07 Item 14 Appendix Exh7-14ET
• Media Type: D
• Archive: No

Exh. 7-ET-4 Revision Date: 11/8/21
Revision No.: TR-151

Taylor Ditch
Station
Peak
Flow
(CFS)
Average
Slope (%)
Channel
Type
Side
Slopes
Minimum
Depth
(Feet)
Erosion
Protection
Station 0+00
to 10+00 140.44 6.9 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 12”
Station 10+00
to 35+00 94.81 7.1 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 9”
Station 35+00
to TD-1 87.47 10.7 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 9”
TD-1 to TD-2 103.11 6.8 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 9”
TD-2 to
117+58 131.44 9.8 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 12”

East Taylor Ditch

The East Taylor Ditch is a tributary channel to the Taylor Ditch. The area contributory to
the East Taylor Ditch is less than one square mile. Therefore, the appropriate storm event
for the design of this channel is the 10-year 24-hour event. The lower portion of the East
Taylor Ditch from ETD-1 stock pond to the confluence with the Taylor Ditch is rirap
lined.

A SEDCADTM model (10 Year 24 Hour Effluent Demonstration model) has been
included which evaluates the peak flow and total runoff volume for each of the channel
segments for the 10 year, 24-hour storm event. The channel configurations for the 10
year 24 hour storm for the East Taylor Ditch are summarized below.

East Taylor Ditch
Station Peak Flow
(CFS)
Average
Slope
(%)
Channel
Type
Side
Slopes
Minimum
Depth
(Feet)
Erosion
Protection
Station
0+00 to
ETD-1
12.22 11.8 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 6”
ETD-1 to
38+30 17.16 1.8 Trapezoidal
12’ bottom 3H:1V 4.0 Vegetation
38+30 to
73+40 17.16 9.5 Trapezoidal
12’ bottom 3H:1V 4.0 Riprap,
D50 = 6”

Taylor Trib Ditch

The Taylor Trib Ditch is a tributary channel to the main Taylor Ditch. The area
contributory to the Taylor Ditch is very small; therefore, the appropriate storm event for