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Page Exh. 25F-3 Revision Date: 6/16/21 <br /> Revision No.: TR-149 <br /> As shown of the attached SEDCADTM, culvert 16 is configured to require a 30 inch culvert. All <br />culverts for the Collom Haul Road are 36 inch culverts; therefore all installed culverts with 36 <br />inch culverts are more than adequate to handle the 10-year 24-hour storm event. <br /> <br />Culvert installation lengths will vary as shown on the plans but typically range from 165 feet to <br />327 feet. Most culverts shall have riprap erosion protection at the inlet and outlet points. Riprap <br />is underlain by a geotextile fabric. <br /> <br />Topsoil Access Road Culvert <br /> <br />The topsoil access road will require a culvert to be installed where the access road crosses the D- <br />2 perimeter ditch. The culverts have been designed to safely pass the 10-yr, 24-hr storm event in <br />accordance with Rule 4.03.1(4)(e)(i). SEDCAD’s culvert utility option was utilized since a <br />known peak discharge (cfs) for the D-2 Ditch is presented in Volume 18B, Exhibit 7, Item 23, <br />Part C. The following specifications were utilized to for this culvert: <br /> <br /> Peak Discharge: 10.52 cfs Length: 160 feet <br /> Pipe Slope: 3.1% Manning’s n: 0.024 <br /> Maximum Headwater: 4 feet Entrance Loss Coefficient: 0.90 Ke <br /> Tailwater: 0.0 feet <br /> <br />Given these specifications SEDCAD indicates the minimum pipe size required for the D-2 Ditch <br />is an 18” culvert. However, Colowyo will install one 36” culvert. <br /> <br /> <br />