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<br />HYDRAULIC STRUCTURES <br /> <br />DRAINAGE CRITERIA MANUAL (V. 2) <br /> <br />proposed design requires a configuration that differs significantly from known documented guidelines or <br /> <br />when questions arise over the character of the structure being considered. <br /> <br />This chapter deals with structures for drainage and flood control channels. in contrast to dam spillways or <br />specialized conveyance systems. Specific guidance is given on drop structures for channels that match <br />the District's guidelines for grass-lined channels as given in the MAJOR DRAINAGE chapter of this <br />Manual. In addition, guidance is provided for the design of energy dissipators at conduit outlets. <br />Sections on bridges, transitions, and constrictions primarily refer to other sources for more extensive <br />design information. <br /> <br /> <br />Photograph HS-2 <br /> <br />The Clear Creek 1-25 vertical concrete drop structure was a "drowning machine" until it was <br />retrofitted by COOT with a 10:1 downstream face. (Photograph taken before retrofit.) <br /> <br />1.2 Channels Used for BoatinQ <br /> <br />There are streams in the District in which rafting, canoeing, kayaking, and other water-based recreational <br />activities occur. Design and construction of hydraulic structures in these waterways require a standard of <br />care consistent with common sense safety concerns for the public that uses them. The ultimate <br />responsibility for individual safety still resides with the boating public and their prudent use of urban <br />waterways. <br /> <br />HS-2 <br /> <br />06/2001 <br />Urban Drainage & Flood Control District <br /> <br />- <br /> <br />e <br /> <br />e <br />