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Thus, the 36 inch diameter is more than adequate. All other culvert installations would be <br /> expected to predict similar or smaller culvert installations. <br /> Several of the culverts listed in Table 1 do not actually cross the Collom Haul Road but are <br /> associated with related activities. Culverts 5, 6, 6A, 51, and 52 are shown on Map 25F and are <br /> associated with the Elevated Crossing of Moffat County Road 51. Likewise, culverts 54 and 55 <br /> are associated with the Jubb Creek Access Road shown on Volume 18, Figure D5. <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. Table 3 presents the lengths, slopes, and quantities for the <br /> individual culverts as specified by HDR,the road design engineering company. <br /> Topsoil Access Road Culvert <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 1813, Exhibit 7, Item 23, <br /> Part C. The following specifications were utilized to for this culvert: <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 /> 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 /> Exh. 24-1-3 Revision Date: 7/30/19 <br /> Revision No.: TR-133 <br />