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CJ <br /> <br />• <br />North Decline Roadway Drainage <br />Calculation Rational and Results Summary <br />Rational: <br />- Calculated using Sedcad+ Ver. 3 <br />- Areas, slopes and flow paths digitized from 100 scale topo map flown in 11/94. The <br />attached 200 scale diagram represents the subwatersheds digitized. <br />- To be consistant with previous North Decline runoff calculations for diversion ditches <br />on the site, see Appendix 13-2, a CN of 78 representing a C-soil group with 20 <br />cover in a Sage-grass vegetation community was used for the reclaimed aces east of <br />Access Road 2 and a CN of 87 representing a C-soil group with dirt roads was used <br />for the roadway drainage area. <br />- 10 year 24 hour storm event of 1.4". <br />- Culvert below Pond 7 includes the discharge of a 10 year 24 hour event from Pond 7. <br />Results Summary: <br />Structure # Structure Description <br />Design <br />111 Ditch W of AR-2 above P7 <br />] 21 Ditch E of AR-2 above P7 <br />122 Culver to Pond 7 <br />131 Ditch W of AR-2 below P7 <br />132 Culvert below Pond 7 <br />l:l side slopes, 3.2 % grade, 0.60' min. depth. <br />1:1 side slopes, 3.0% grade, 0.82' min. <br />depth. <br />1% grade, 6" required, 12" in place. <br />1:1 side slopes, 5% grade, 0.50' min. depth. <br />1% grade, 12" required, 12" installed. <br />13-1-2 <br />(New 12/16/96) <br />