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A road traverses across the Section 16 Fill Ditch near station 1+85, which provides <br /> access to maintain power line infrastructure in the area. A culvert is installed and <br /> maintained in the Section 16 Fill Ditch, but it is not a Colowyo mining related structure. <br /> Please see Volume 1, Section 4.12 for a further discussion. The culvert is modeled even <br /> though it is not a Colowyo culvert to ensure it is sized appropriately. <br /> Given that, the peak storm discharge of 1.77 cfs requires a minimum of one 12" culvert is <br /> necessary in the Section 16 Fill Ditch. However, one 24" culvert is installed, which will <br /> more than suffice for the flows generated by the Section 16 Fill Ditch. <br /> Trib F <br /> Trib F is constructed in reclamation areas adjacent to the South Taylor Pit and the <br /> Section 16 reclamation areas. Originally, this channel was modeled in accordance with <br /> Rule 4.05.3(3) for the 10 year 24 hour event. However, the post-mining watershed <br /> contributing to the channel is so small that SEDCADTM cannot calculate actual flows <br /> when inputted into the model, and errors are noted for insufficient flows. Therefore, <br /> there is not any SEDCADTM outputs contained in this append for Trib F. The channel is <br /> constructed as trapezoidal ditches, 12' bottom widths, 2H:1 V side slopes, 4' of depth, <br /> and a rip rap lining with a D50 size of 12". <br /> Page Exh. 7-145-4 Revision Date: 11/16/20 <br /> Revision No.: TR-145 <br />