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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 3 <br /> <br />4. Addition of a concrete sill on the downstream face of the <br />existing dam, immediately below the crest. This improved flow <br />patterns and safety by eliminating an hydraulic jump and <br />reverse roller there during higher river flows. <br /> <br />5. Inclusion of a solid wall upstream of the existing dam crest <br />adjacent to the Englewood intake. This alters the movement <br />of sediment through the intake structure. This was requested <br />by the design engineer formerly retained by the city of <br />Englewood. <br /> <br />6. Inclusion of an open screen barrier upstream of the solid wall <br />to exclude boaters from the Englewood intake. <br /> <br />7. Development of a system of operational radial gate settings for <br />use by city of Englewood personnel to assist in safety and to <br />increase efficiency. <br /> <br />8. Sediment studies to assess the effect of the modifications and <br />embankments on the operation of the Englewood intake. <br /> <br />WWE personnel met frequently with USBR personnel during the course of the model <br />study. The interested parties met at the laboratory to participate in the running of the <br />model, to approve revisions to the model, and to suggest further revisions such that the <br />final configuration of the model best met each interests' individual needs. The USBR was <br />cooperative in studying the many issues raised by involved parties. The CWCB was <br />cooperative in giving consideration to each and every concern raised by the parties. The <br />results of these analyses and meetings were incorporated into a series of memoranda which <br />are included as Appendix B. <br /> <br />The U.S. Bureau of Reclamation's report entitled "Union Avenue Dam Boatchute Study" <br />underwent an intensive and detailed review by Bureau personnel to insure reliability and <br />accuracy of the hydraulic model analysis. <br /> <br />The conclusions and recommendations made by Bureau personnel provide design criteria <br />to reduce the existing "dangerous reverse roller hydraulic jumps" and provides boatable <br />waves downstream throughout the entire selected flow range from 100 to 1500 cfs. <br /> <br />The Bureau study provides detailed guidance for design of the boatchute, including <br />dimensions, slopes and critical elevations. <br />