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• ~' 1 • <br />Summary of Watershed Parameters, Peak Flow, and <br />Design Statistics for Culverts in Haul Road A <br />Seneca II-W Mine, Routt County, Colorado. <br />WATERSHED PARAMETER <br />Selected <br />Peak Discharge Culvert Culvert HW <br />Area Length Relief 10-Yr., 24-Hr. Length Diameter Required <br />Culvert (Ac) (Mi) (Ft) CN (CFS) (Ft.) (In.) (Ft)(2) <br />HRC-A1 774.0 2.13 955 _ 76 65.2 143 72 3.1 <br />HRC-A3 41.2 0.68 225 80 12.6 80 24 2.1 <br />HRC-AS 135.2 0.79 475 76 23.7 142 36 2.5 <br />HRC-A6 39.6 0.48 230 89 27.0 160 36 2.7 <br />HRC-A7 38.4 0.48 175 89 26.2 160 36 2.6 <br />HRC-A8 38.1 0.45 180 89 26.0 130 36 2.6 <br />1 <br />Culverts redesigned with SEDCAD . <br />(2) <br />Minimum cover over the top of culverts = minimum 2 feet. <br />