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<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Mr. David W. Walker <br />October 30, 1989 <br />Page 2 <br /> <br />3. Urban Drainage & Flood Control District <br /> <br />4. South Suburban Metropolitan Recreation and Park District <br /> <br />5. City of Englewood <br />6. City of Sheridan <br /> <br />7. Whitewater Boating Association <br /> <br />MODEL STUDY <br /> <br />The approved alternative from the September 1988 CWCB meeting was used as the basis <br />for the layout of the 1:18 scale model constructed and tested by personnel of the U.S. <br />Bureau of Reclamation (USBR) in the federal hydraulics laboratory located at the Denver <br />Federal Center. <br /> <br />The model represents the river upstream and downstream of the Union Avenue bridge, the <br />modifications to the existing USACE dam, and the first embankment downstream of the <br />dam. <br /> <br />The results of the model study are presented in a report by the USBR. The USBR model <br />study, with inputs from the independent entities, refined and quantified many parameters <br />which resulted in numerous and positive improvements and modifications to the layout <br />approved in September 1988. Model studies resulted in resolving numerous questions on <br />hydraulics and sediment raised by Englewood. <br /> <br />Some of the subjects discussed in the USBR report include: <br /> <br />1. Refinements to the boatchute configuration for improved <br />boatability. <br /> <br />2. Reduction in quantity of rock and fill material on the face of <br />the existing USACE dam. <br /> <br />3. Elimination of the need to raise the inner wall downstream of <br />the radial gate associated with the Englewood water supply <br />intake structure. <br />