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Exh. 7-23B-3 Revision Date: 9/18/23 <br /> Revision No.: TR-160 <br />Temporary Channels <br /> <br />The Section 25 Pond watershed is comprised of three temporary channels the D-3 Ditch, C-14, <br />and C-15 channels respectively. The configuration for these channels are include in the Section <br />25 Pond 10-Year, 24-Hour During Mining Storm Event Demonstration and are further outlined <br />as described in the following table: <br /> <br />Ditch Name <br />Flow, <br />Q <br />Slope, <br />% Type <br />Specified <br />Depth <br />Bottom <br />Width <br />Side <br />Slope, <br />H:1V <br />Rip <br />Rap, <br />D50, in <br />D-3 Ditch 0.02 16.1% Riprap 4.0 12.0 2.0 6.0 <br />C-14 3.19 3.0 Erodible 3.0 3.0 2.0 NA <br />C-15 1.91 3.0 Erodible 3.0 3.0 2.0 NA <br /> <br />The C-14 and C-15 channels will both have culverts installed where the Section 25 Pond Access <br />Road cross both channels. The culvert sizing was based on the largest flow from the C-14 <br />channel at 3.19 cfs. Given this flow, a 12-inch culvert will suffice for both channels. The <br />culvert demonstration can be found in the attached SEDCADTM demonstration. <br /> <br /> <br />