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NORTH TRIBUTARY TO BASIN 6200 Reach No. 1--pierce Court to Ken Caryl Road There are serious erosion and sedimentation problems in this reach. Controlling erosion, keeping the channel grass short, and cleaning out waterway crossings should be emphasized. Reducing the flow velocity by installation of drop structures and stabilizing the drainage channel bottom and side slopes by hydro-mulch seeding would reduce erosion in the upstream reach, and thereby reduce the sediment deposition in the downstream reach. . Remove the recent drainageway construction between pierce Court and Pierce Street and restore the drainage channel to the historical condition. For erosion control, install a 5-foot gabion drop structure. . Install two 3-foot gabion drop structures, regrade the channel bottom and side slopes and stabilize the channel by lining with grass between pierce Street and Newland Street. . Install a concrete pad to protect the Denver Water Board conduit crossing the drainage channel below Newland Street. . Install three 3-foot gabion drop structures, regrade the channel bottom and side slopes and stabilize the channel by lining with grass between Newland Street and Kendall Blvd. . Install three 3-foot gabion drop structures, regrade the channel bottom and side slopes and stabilize the channel by lining with grass between Kendall Blvd. and Ken Caryl Road. . Dump a rock rip rap layer 10 feet long at downstream side of each existing culvert in this reach to eliminate the local erosion problems at culvert exits. Reach No. 2--Ken Caryl Road to County Line The alternative solutions for this reach have benefit-cost ratios less than 1.0. On this basis, the least cost plan would usually be recommended. However, the least cost alterna- tive for this reach has legal problems and presents hazards to the public from excessive street flow and high flow velocity. Therefore, the following improvements are recommended. 2-4 I I I I I I I I I I I I I I I I I I I