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I 42 I I I I I I I construction to protect against rock abrasion action because of the high velocities (30-50 fps). There will be a stilling basin at Boulder Creek to protect against erosion to Boulder Creek Channel, The old Gregory Creek below 7th Street will be adequate for the tributary basins below 7th Street. Routes will be developed to prevent water from flow- ing into the Anderson Ditch. ~ Gulch. Channel refurbishing will begin Just above Bellview Drive and extend down to the special entrance structure shown above 15th Street on the drawings. The existing driveway culvert above that lo- cation will be removed and replaced in cooperation with the owners. Water will be funneled into a culvert at the entrance check dam structure and routed to the existing channel location below 15th Street. After energy dissipation the water will tumble down a series of gabion drops and flow into the culvert at 17th Street. Because of the steep grade of King Avenue, special hydraulic losses must be created. The least costly and easiest to maintain are manhole bends. Although slight prob- lems are created by utility crossings, this provides a reasonable sol- ution to the need of controlled velocities. The conduit will then empty into the Bluebell storm conduit at 19th and Mariposa. I I I I I Bluebell Canyon Creek. Park landscaping at Chautauqua Park will be the starting channel work on Bluebell Canyon Creek. Below the park several small check dams will be built to stop the movement of boulders and debris. These check dams will be built without the use of large con- struction equipment so as to preserve the neighborhood landscaping. At 15th Street the major portion of the water will flow into the conduit in Mariposa Avenue. The waters will be guided into the conduit by a hand placed and mortared rock wall. The water that overflows will pass into the streets and will be gradually collected as it flows down the streets. Signs should be placed to warn people to park off the street during storms. The King Gulch culvert will join at 19th Street and Mariposa Avenue. The line will turn at 21st and flow north across Base- line Avenue into an open channel carried north of the tennis courts at 21st Street and Baseline. After crossing Broadway, the flow will be spread by special landscaping and be contained by a berm as it flows east along the southern Colorado University property. This will pre- serve the landscaping of the area. At the southeast corner the flow will go into an enlargement of the existing pond. Outflow will pass into a grass lined channel that will flow north along 28th Street. Drainage from the Kittridge Hall area will pass into a lined channel section after fIlling the existing gulch with water. After another length of grass channel the flow will go into another lined reach which will cross Colorado Avenue and 28th Street and flow along 28th Street over the extended Wellman Canal and into Boulder Creek. I I I I I I I Skunk Creek. Enlargement of a natural detention and sedimentation pond will be the beginning of channel Improvements on Skunk Creek. After going under Hollyberry Lane the natural channel will be improved by re- moving debris and providing protection where necessary. A large deten- tion and sedimentation system will be built to replace and improve the deteriorating dams now on the National Bureau of Standards property. The channel in the Green MountaIn Cemetery will be left In its present