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Exh. 7-14SP-2 Revision Date: 12/13/22 <br /> Revision No.: TR-158 <br />Temporary Ditches <br /> <br />The Streeter South Side Ditch routes water from Phase III released areas to the Streeter Pond. <br />The location of the temporary ditch can be found on Map 12 and Figure Exh. 7-14SP-2. Design <br />information for the temporary ditch is as follows: <br /> <br /> Streeter South Side Ditch <br />Station Peak Flow <br />(CFS) <br />Average <br />Slope <br />(%) <br />Channel Type Side <br />Slopes <br />Total <br />Depth <br />Erosion <br />Protection <br />0+00 to 16+50 0.04 3.0 V Ditch 2’ <br />Bottom Width <br />1H:1V Left <br />7H:1V <br />Right <br />0.5 Vegetation <br /> <br /> <br />Post Mine Channels <br /> <br />The Streeter Pond watershed is comprised of two post-mining channels. The main channel is the <br />Streeter Ditch, which will convey post mining surface water flows to the Streeter Pond. <br />Buckskin Ditch is a tributary to the Streeter Ditch. The locations of both channels are presented <br />on Map 12 and Figure Exh. 7-14SP-2, and the channel profiles are presented on Map 33. <br /> <br />The assumed hydrologic condition for both channels is the post mine condition when the entire <br />Streeter watershed is reclaimed and reporting to the Streeter Pond. <br /> <br />The upper segments of the Streeter Ditch and the entirety of Buckskin Ditch have a contributing <br />area of less than one square mile. They could be designed in accordance with Rule 4.05.3. <br />However, for ease since the lower segments of Streeter Ditch meet the requirements of Rule <br />4.05.4, both ditches have been designed for the 100-year, 24-hour storm event. <br /> <br />A SEDCADTM model has been included which evaluates the peak flow and total runoff volume <br />for each of the channel segments for the 100 year, 24-hour storm event. The channel <br />configurations for the 100 year, 24 hour storm for the Streeter and Buckskin Ditches are <br />summarized below.