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I I I I I I I I I I I I I I I I I I I Mr. David W. Walker October 30, 1989 Page 4 The Bureau points out that with the present city of Englewood water intake design, boaters would be drawn into the intake area during sluicing. However, the Bureau provides recommendations to reduce the hazard to boaters and to improve the present sluicing capacity. The Bureau also recommends the location for an open bar barrier to prevent boaters from inadvertantly entering the Englewood water intake. These recommendations are especially important to Englewood in terms of helping make their intake works less of a hazard to boaters using the river. The Bureau model study also recommends steps to reduce dam rockfill by 1500 cubic yards. They also recommend against raising the left sluiceway wall. These represent substantial cost savings. Sluicing will be improved by raising the low intake wall. This wall raising was originally suggested by McLaughlin Water Engineers during a conference held early during the assignment. On unique hydraulic engineering design, it is usually necessary to modify certain features for optimization, as in this case. We appreciate the assistance and cooperation of McLaughlin Water Engineers who participated in the original project with the USACE. A special feature of the Bureau's model study was the definition of flow velocities and flow direction for boating evaluation. This is a valuable aspect of the study. One important finding of the Bureau's is that the proposed boatchute will not adversely affect the Englewood intake structure. With the reduced existing hazards associated with the intake, the net impact of the proposed CWCB project will be beneficial to Englewood. The Bureau points out that the existing configuration of the dam structure "can trap a boat or person and is hazardous when a boat goes over the dam." They go on to state that "recreational boating has become more popular on the South Platte in recent years; therefore, boater safety has become a primary concern." HYDRAULICS Calculations of the hydraulic effects of the proposed improvements shown on the preliminary design drawings reflect USBR findings or have been verified by the model study. Other interim calculations were made during the preliminary design and testing as part of an iterative process to achieve an optimum balance for all project objectives.