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<br />5. A recommended location for an open bar barrier to prevent boaters from entering the water <br />intake area upstream of the Englewood intake was determined. <br /> <br />6. As a result of this study, the volume of rockfill for the Union Avenue dam modification was <br />reduced by 1,500 yd' over the initial design. Downstream rockfill embankments can also be reduced <br />in volume compared to the initial design. <br /> <br />7. The need to raise the left sluiceway wall to the right of boatchute 1 was eliminated. <br /> <br />8. Sediment tests indicated that the Englewood intake with the recommended high wall will sluice <br />sediment better than the present design. <br /> <br />9. Sediment deposition patterns in the first pool between boatchutes 1 and 2 were determined. <br />The deposits will not affect sluicing operations. <br /> <br />10. Flow velocities and directions in the pool are acceptable for boating before or after the <br />deposition occurs. <br /> <br />11. A long wedge block (fig. 18) was added along the downstream face of Union Avenue dam to <br />eliminate a reverse roller that could trap boaters when the main dam crest is overtopped. The <br />discharge coefficient of the crest was unaffected by the wedge. <br /> <br />12. During the 100-year flood, only minor movement of 3-foot rip rap occurred on the downstream <br />face of the dam. An area to the right of boatchute 1 should be stabilized to prevent erosion. <br /> <br />13. Addition of the boatchutes will not adversely affect the Englewood intake structure. <br /> <br />14. Discharges up to the COE 100-year flood of 16,400 ft' /s were observed in the model. Model <br />data indicate that the water level is contained within the streambanks up to the 100-year now. <br /> <br />THE MODEL <br /> <br />Description <br /> <br />Alto 18 model scale was chosen primarily due to the need to simulate sediment transport and to <br />study boating flows as low as 100 ft' Is. The model features included the Union Avenue dam, city <br />of Englewood intake structure, radial-gate-controlled sluiceway, downstream pool, and the second <br />rockfilJ dam and boatchute (fig. 6). The large bend in the river upstream from the bridge was <br />included to duplicate now conditions at the Englewood intake structure. <br /> <br />Model Measurements and Instrumentation <br /> <br />The model was calibrated to obtain stage-discharge curves over the dam, through the Englewood <br />sluice, and through the Englewood intake. <br /> <br />Point gauges were used to measure water surface elevations in the pool upstream of the crest, <br />through the boatchute, in the pool between the boatchutes 1 and 2 and the pool after boatchute 2. <br /> <br />2 <br />