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I I I I I I I I I I I I I I I I I I I . The trailer court area at the Tucker Gulch confluence with Clear Creek for use as a stilling area and debris basin during flooding. The above factors were considered in preparing the operating and maintenance cost estimates for the Tucker Gulch and Kenneys Run. Unit cost information is provided in Table VI-l and was derived from information contained in a recent paper prepared by the Urban Drainage and Flood Control District (Ref. 8) and the Phase A Report for CI ear Creek prepared by Wri ght-McLaughl in Engi neers (Ref. 18). . The area along the improved West Fork Kenneys Run channel through the Golden High School property. . The state-owned I and and pri vate propert i es associ ated with the construction of the three proposed detention basins. Other areas requlrlng acquisition are shown on the master plan drawings. Recommendations are also made in the sheet commentaries regarding access rights and easements for maintenance purposes. These recommended easements or maintenance access agreements are not to be considered as recommendations for right-of-way acquisition. Open Space Planning Operation and Maintenance To tie in with regional plans to develop the Clear Creek corridor with parks, recreation areas, open space, bikeway systems and trail systems, similar open space uses are being planned along Tucker Gulch and Cressman Gulch drainage- ways. Details regarding the Clear Creek plans can be found in the Wright- McLaughl i n Engi neers, Phase 8 Report for CI ear Creek, dated September 1982. Open space and recreat i ona I pI anni ng for Tucker Gul ch was factored into the master plan by recogni zi ng the need to acqui re flood-prone propert i es and provide access to areas along the improved channel and in upper undeveloped reaches. The improved fl oodp I ai ns in the upper reaches of Tucker Gul ch make open space planning a most realistic and pracitical solution. Routine maintenance of improved urban drainageways is of key importance and consists of vegetation mowing, trash and debris cleanups, weed control, and revegetation efforts. The Urban Drainage and Flood Control District recommends that grass-lined waterways be mowed at least three times a year and cut to a height of 4- to 6-inches. Three to five cleanup operations are recommended in the spring and summer months to keep channels clear of serious accumulation of trash and debris. Weed control and revegetation operations should be scheduled as required, based on visual inspection of the drainage- ways. On the Kenneys Run drainageways, planning for open space uses through the downtown area is unrealistic. In the undeveloped areas above 24th Street, open space uses merit further consideration and can easily be incorporated in land use planning for the proposed stormwater detention basins. Restoration and rehabilitative work is also considered as normal operation and mai ntenance. Exampl es of restorat i on work i ncl ude detent i on pond mucki ng, trashrack cleaning, rebuilding steep rundowns, tree thinning and cleaning, eros i on repai rs, and I oca I channel gradi ng and shapi ng. Exampl es of rehabil itat i ve work i ncl ude rebuil di ng drop structures, placement of ri prap, establishing maintenance access, and providing protection for box culverts, retaining walls or road crossings. Water Quality and Erosion Control In recent years, the concern over the quality of urban stormwater runoff has gained much attention. National recognition of the problem of non-point source pollutants from stormwater runoff was first identified in the 1964 U.S. Public Health Service's publication on the "Po11utional Effects of Stormwater and Overfl ows from Combi ned Sewer Systems". Congress, in recogni zi ng thi s prob I em, authori zed funds under the Federal Water Poll ut i on Control Act of 1965 and fo 11 owi ng I egi slat i on for the research, development, and demonstra- VI-4