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<br />e <br /> <br />e <br /> <br />e <br /> <br />DRAINAGE CRITERIA MANUAL (V. 2) <br /> <br />HYDRAULIC STRUCTURES <br /> <br />2.1.1 Outline of Section. The following section provides guidelines to aid in the selection of alternate <br />types of drops, particularly those used for grass-lined channels. Drops for boatable channels are <br />described separately. <br /> <br />Much of the section is oriented toward hydraulic design and criteria for drop structures. There are two <br />levels of analysis given. One ievel of hydraulic analysis is "detailed." All steps that are important are <br />described, along with design aids. The other ievel is "simplified." Layouts of typical drops, particularly the <br />crest configuration and related channel, are given which result in grass-lined channel hydraulic <br />performance at the maximum depths and velocities normally allowed by the District for these types of <br />channels. The use of these charts allows a quicker start, but certain steps from the "detailed" analysis will <br />still be necessary, particularly the effects of greater unit flows in the low-flow or trickle channel area. <br /> <br />Hydraulic analysis sections are followed by further details appropriate to each of the types of drops that <br />are recommended for grass-lined channels and boatable channel drops. Then, further information on <br />seepage analysis, construction concerns, and low-flow channel structures is given. <br /> <br /> <br />Photograph HS-4 <br /> <br />This grade control structure on the South Platte River was a hazard to the boating public until it <br />was retrofitted by the COOT. Here, a rescue is supervised by Colorado Governor Richard <br />Lamm who was enjoying a rafting trip with friends and the Denver Water Rescue Team. <br /> <br />06/2001 <br />Urban Drainage & Flood Control District <br /> <br />HS-7 <br />