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Page Exh.7-25E-1 Revision Date: 9/18/23 <br /> Revision No.: TR-160 <br />Exhibit 7, Item 25E <br />Collom Haul Road Channel Configurations <br /> <br />Several channels will be utilized to manage storm water runoff from undisturbed and disturbed <br />areas on and along the Collom Haul Road. These channels will route water from culvert outlets <br />and road cutouts to small sumps (best management practice structures for storm water) or to <br />sediment ponds, to allow sediment to settle out and to decrease peak flows prior to discharge. <br />This section addresses the configuration of these channels along the Collom Haul Road. <br /> <br />Exhibit 7, Item 14 in Volume 2D describes the hydrologic methodology used for channel <br />assumptions. Runoff curve numbers assigned to the undisturbed and disturbed lands have been <br />selected in accordance with Table 1 in the Introductory Text for Exhibit 7 in Volume 2D. For <br />channels protected by a riprap liner, selection of minimum riprap size is done using the <br />Simons/OSM method in SEDCADTM. <br /> <br />The following pages present the results of the SEDCADTM models for channels C-1 through C- <br />13. Information for channels C-14 and C-15 can be found in Volume 18B Exhibit 7 Item 23 Part <br />B. <br /> <br />Location, contributing watersheds, and on the ground hydrologic conditions for these channels <br />are reflected on Figures Exh. 7-25E-1 through Exh. 7-25E-8 and specifically denoted by channel <br />on the table below. The dimensions, lining type, and flow characteristics all the channel <br />configurations are included in the SEDCADTM attached outputs for each specific channel. A <br />summary of the channel configurations and minimum construction specifications are <br />summarized on the table below. <br />