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1 I I I I I I I I I I I I I I OBJECTIVES 1-2 The boat chute design must respect established Colorado water law and water rights administration by the State Engineer. By-pass flows through the boat chute cannot infringe upon the decreed water rights of the City of Englewood. FLOW LIMITS FOR BOATING IN A WHITEWATER CHANNEL The range of flows that are minimum and maximum for enjoyable boating will vary according to the type of by-pass structure, the channel width, average gradient, the profile (drop-pool or linear) , the structures creating whitewater features, and the type of. craft that will be navigating the channel. The following is an estimated range of flows assuming various physical parameters. Low Flow Assuming a maximum channel width at any point of 60 feet, the low flow for canoes and kayaks is approximately 50 cfs. This flow rate of 50 cfs would represent the minimum flow for boating use of the facility. This assumes a drop-pool design with each drop at a maximum of two feet. If the drops are over one foot, they should have a sloping face with offset deflectors or "pinch" designs. The riffle areas between the drops and pools should have a "dish" shaped cross section and have a relatively mild gradient. Drop structures that are elongated in an "S" or "V" shape must have a low-flow notch approximately 10 to 15 feet wide and 1 to 1.5 feet deep in a shallow "dish" shape. Straight or straight-angled structures should be avoided. Pools should be 60 to 80 feet long and have their maximum depth at the upstream end of approximately 4 feet. The profile through the pool should rise gradually from the drop to the riffle or "tail-out" area.. All pool edges, drop structures, and channel sides should be gradually curving to direct the flow, not straight lines.