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FISH CREEK ACCESS ROAD CULVERT DESIGN, ACCESS ROAD DITCH <br />AND <br />MISCELLANiOUS CULVERTS REQUIRED FOR ACCESS ROAD <br />Purpose: 1) Design a culvert for the Vent Shaft Access road crossing of Fish Creek a[ the following <br />Twentymile Mine coordinates (46,225N 21,925E -See Figure I) . 2) Design the access road ditch. <br />3) Design a culvert for the old irrigation canal [hat the Access road crosses. 4) Design a typical culvert <br />size for any miscellaneous drainages the Access road may cross. <br />1) FISH CREEK CULVERT <br />Design Parameters: Use 10-year, 24-hour storm = I.Bin <br />Land use: undisturbed, CN = 63 <br />Watershed = 33, 765 ac (measured from USGS quad maps -See Figure 2) <br />Use SEDCAD4 model and culvert design utility. SEDCAD4 printouts attached. <br />Results: <br />Peak Flow = 160cfs <br />Culvert Required = 60in CMP - with a minimum 2 feet compacted cover and rip rap protection at inlet and <br />outlet. <br />• 2) ACCESS ROAD DITCH <br />Design parameters: Use 10-year, 24-hour storm = 1.Sin <br />Land use: undisturbed, CN = 63, Road surface (gravel) CN = 89 <br />Watershed: Use worst case, 2.l ac Road, 10.0 ac undisturbed <br />Road grade varies from L6% - 11.2% (Ditch -gravel lined) <br />Results: <br />Peak Flow = 1.94 cfs <br />Ditch Designs and SEDCAD4 printouts attached <br />3) IRRIGATION CANAL CULVERT <br />The Vent Shaft Access road will cross an old irrigation canal. The canal is no longer in use, however, <br />water has been observed Flowing in the canal. A maximum Flow of 2.5 cfs has been assumed in the culvert <br />design. <br />Results: <br />Culvert required = 12in CMP <br />C~ <br />J <br />