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cross-overs are surface dips notched into the road <br />surface to carry channelized flow. Inslope drainage <br />down gradient from the water cross-over will be <br />allowed to migrate across road at 1B to the inslope <br />drain at 2B. <br />Segment 2 (2A to 2B): <br />Drainage Areas - Disturbed Area 2A <br />Disturbed Area 6 <br />Undisturbed Area lA <br />Drainage Control - Inslope drain using road width for containment. <br />Road width used for calculation 12.5'. <br />Segment 3 (3A to 3H): <br />Drainage Areas - Disturbed Area 2A <br />Disturbed Area 6 <br />Undisturbed Area lA <br />Drainage Control - V-Ditch on inslope with run-out channel to release <br />drainage, Although drainage areas for this segment <br />are considered disturbed (modeling nomenclature) all <br />drainage consists of road surface areas. The runout <br />channel will have the same configuration as the ditch <br />except it will be deepened to have a freeboard of 1 <br />ft. Four loose rock filters will be placed in the <br />runout channel to dissipate water velocity. Rock <br />filters will be constructed to a height of ditch <br />design flow depth. Freeboard not filled with rock <br />material to enable flow to pass should rock filters <br /> become plugged with ice and 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 /> Segment 4 (4A to 4B): <br /> Drainage Areas - Disturbed Area 7 <br /> Undisturbed Area 23 <br /> Disturbed Area 8 <br /> Drainage Control - Inslope drain using road width for containment. Road <br />• <br /> 3.SF-4 May 14, 1993 <br />