2021-04-05_PERMIT FILE - C1981019A (5)

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Ta for Ditch Peak Minimum Average Channel Side Erosion Station Flow Sloe % Type Slopes Depth Protection CFS Feet Station 0+00 140.44 6.9 Trapezoidal 3HAV 4.0 Riprap, to 10+00 12' bottom D50= 12" Station 10+00 94.81 7.1 Trapezoidal 3H:1 V 4.0 Riprap, to 35+00 12' bottom D50 = 9" Station 35+00 87.47 10.7 Trapezoidal 3HAV 4.0 Riprap, to TD-1 12' bottom D50 = 9" TD-1 to TD-2 103.11 6.8 Trapezoidal 3HAV 4.0 Riprap, 12' bottom D50 = 9" TD-2 to 120.23 9.8 Trapezoidal 3H:1V 4.0 Riprap, 117+58 12' bottom 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 Peak Minimum Average Channel Side Erosion Station Flow Sloe % Type Slopes Depth Protection CFS Feet Station 0+00 1.50 11.8 Trapezoidal 3H:1V 4.0 Riprap, to ETD-1 12' bottom D50 = 3" ETD-1 to 17.16 1.8 Trapezoidal 3HAV 4.0 Vegetation 38+30 12' bottom 38+30 to 17.16 9.5 Trapezoidal 3H:1V 4.0 Riprap, 73+40 12' bottom 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 Exh. 7-ET-4 Revision Date: 3/24/21 Revision No.: TR-145