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• <br /> <br />Undisturbed Area 26 <br />Disturbed Area 10 <br />Drainage Control - V-ditch on inslope controls all drainage uphill. Road <br />is insloped to enable road surface drainage to sheet <br />flow to V-ditch. V-ditch conveys drainage to culvert <br />TA-2. <br />Segment 8 (8A to 8H): <br />Drainage Areas - Disturbed Area 7 <br />Undisturbed Area 23 <br />Disturbed Area S <br />Disturbed Area 9 <br />Disturbed Area 11 <br />Undisturbed Area 24 <br />Undisturbed Area 25 <br />Undisturbed Area 26 <br />Disturbed Area 10 <br />Undisturbed Area 5 <br />Drainage Control - V-ditch on inslope controls all drainage uphill. Out <br />side berm is used to capture road surface drainage. <br />Drainage is released and captured further downhill <br />along Segment 10 of the road. The runout channel will <br />have the same configuration as the ditch except it <br />will be deepened to have a freeboard of 1 ft. Four <br />loose rock filters will be placed in the runout <br />channel to dissipate water velocity. Rock filters will <br />be constructed to a height of the design flow depth. <br />Freeboard not filled with rock material to ensure flow <br />passes to sedimentation pond should rock filters <br />become plugged with ice or sediment. The additional <br />freeboard is provided to ensure that the design flow <br />and required Freeboard is maintained in the event of <br />the rock filters becoming plugged. <br />• <br />3.SF-6 <br />May 14, 1993 <br /> <br />