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L J <br />lJ <br />• <br />TABLE 13-4 <br />DRAINAGE CONTROL STRUCTURES <br />ROADSIDE SOUTH PORTAL (Exhibit 66) <br /> CROSS- <br /> SECTION <br />STRUCTURE EXHIBIT DESCRIPTION <br />Sediment Pond #8 2Q Designed capacity 2.63 A.F. plus 400,000 <br /> gallons (1.23 A.F.) with at least 1 ft. <br /> freeboard; embankment slopes designed <br /> at 1v:2h. <br />Sediment Pond #9 Q2 Designed capacity 1.03 acre-ft. with at <br /> least 1 h.. freeboard; embankment slopes <br /> designed at 1v:2h. <br />South Diversion Ditch 2Q Designed capacity 3.5 cfs., gradient 0.3 - <br /> 5.0 /° <br />South Diversion 9" Minimum <br />Culvens <br />Lower Catch Ditch No. 20 Designed capacity 0.6 cfs., gradient 1% <br />1 <br />Lower Catch Ditch No. 2Q Designed capacity 2.4 cfs., gradient 1 <br />2 <br />Access Road Ditch Designed capacity 0.13 cfs., gradient 7. /° <br />Guardshack channel Designed capacity 0.5 cts., gradient <br /> 0.25% <br />Guardshack to Pond 8 Designed capacity 0.5 cfs., gradient 0.2% <br />Ditch <br />Culvert to Pond 8 12" Minimum <br />Portal Diversion Designed capacity 0.02 cis., gradient 15% <br />Portal Area Drain Pipe 8" Minimum <br />Conveyor Drain Pipe 6" Minimum <br />Top of RSRDA Drain 2 - 8" Minimum <br />Pipes <br />Above RSRDA Drain Appendix 13-2 12" Minimum <br />Pipe Pg. RSS-28 <br />Combined RSRDA Appendix t3-2 8" Minimum <br />Drain Pipe Pg. Rss-28 <br />