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I I I I I I I I I I I I I I I I I I I B-2 o Channel bed stabil ity will be considered with design. and drops and checks provided to control channel gradient. 2. RIPRAPPED AND STRUCTURAL WALLED CHANNELS. rligher velocity artificial channel s will be used with discretion, and then only to accomodate existing develop1lent for minimum reaches. o Riprap size, design velocity and "n" values are to be based upon the 1 atest Urban Drainage and Flood Control District criteria. (Reference 32) . o 2.5:1 is the maximum recommended slope. For areas of restricted right-of-way, vertical concrete walls can be designed to contain the channel. Care must be taken for freeze, thaw, groundwater, expansive soil effects, and protective fencing along the top of the walls. o The low flow channel would be sized as described under grass-lined channel s. o Channel bed stability will be considered as described under grass- 1 ined channel s. o Freeboard will be no less than 1.0 foot. 3. BRIDGES. Bridge improvements for Clear Creek will be designed to main- tain a minimum of 2 feet freeboard above the 100-year design water sur- face to provide for potential debris blockage. 4. EXISTING UTILITY CONFLICTS. Utilities other than sanitary sewers will be relocated as needed. Sanitary sewer confl icts will be resolved on an individual basis in final design. Util ity field surveys will be requir- ed prior to final design. 5. EXISTING WATER RIGHTS. Existing water rights will be protected, as ap- propriate, including surface diversions and underground conduits. 6. MAINTENANCE ACCESS. Access for maintenance of the channel improvements will be provided to allow for inspection of the channel and transporta- tion of maintenance equip1lent and material s.