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2.4 CULVERT DESIGNS <br />'This section contains cuhect design information for the D-Scam Portal, Pond D, Pond B, and Hubbard Cmek <br />Pansitc areas. ~\II culverts are designed to safely pass the peak tlow from the 10-tear, 24-hour storm event.. <br />Cuh~crrs DA and D~A2 are designed to safel}' pass the peak flocs from the I00-year, 3~hour storm event. <br />The 1110-vest, 24-hour peak flow Eor Elk Creek is 107.Ocfs (using a conservative Chi of 60). The methodolog}' and <br />assumptions used to determine the peak flow are included in previously approved submittals (refer to Section 2) <br />Cuhects for the ll-Seam Portal, Pond D, and Pond B were sized using the L'.S. Bureau of Public Roads <br />Homographs. The culvert Homographs can be found in the covert design section. The culverts were designed <br />assuming aheadwater/diameter razio of 1.5 (unless otherwise specified). ~1 summary of inputs and results are <br />shown on the Eollocving Tables. <br />Cuh~erts HCGI, HCC-2, and HCC-3 were sized using Sedcad and calculations are shown in Section 10. <br />Culvert inlet protection will consist riprap extending to the highwatcr level (1.5 feet above the top of culvert). <br />Small sumps mac be constructed at the entrances of culverts if O~ILLC derermines no under-cutting will occur. <br />Straw bales will be placed up-stream of culvert entrances, when appropriate, to limit tlow velocities and to control <br />s'cdimcnt. <br />