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I I I I I I I I I I I I I I I I I I I IIIK Wright Water Engineers, Inc. DENVER OFFICE 2490 West 26th Ave., Suite 100 A Denver, Colorado 80211 (303) 48(l. 1700 August 9, 1989 GLENWOOO SPRINGS OFFICE 818 Colorado Avenue P. O. Box 219 Clenwood Springs, Colorado 81602 (303) 945.7755 Denver Direct line: 893-1608 Mr. David Walker Colorado Water Conservation Board State Services Building 1313 Sherman Street Denver, Colorado 80203 Dear Mr. Walker A draft copy of the U. S. Bureau of Reclamation's report entitled "Union Avenue Dam Boatchute Study" is attached for your general information. The report is undergoing an intensive and detailed review by Bureau personnel to insure reliability and accuracy of the hydraulic model analysis. The conclusions and recommendations made by Bureau personnel provide design criteria for elimination of existing "dangerous reverse roHer hydraulic jumps" and provides boatable waves downstream throughout the entire selected flow range from 100 to 1500 cfs. The Bureau study provides detailed guidance for design of the boatchute, including dimensions, slopes and critical elevations. The Bureau points out that with the present water intake design, boaters would be drawn into the intake area during sluicing. However, the Bureau provides recommendations to protect boaters and to improve the present sluicing capacity. The Bureau also recommends the location for an open bar barrier to prevent boaters from entering the Englewood water intake area. 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 below that which Wright Water Engineers had originally planned in its layout. They also recommend against raising the left sluiceway wall which Wright Water Engineers had planned on earlier to assist in hazard management. These represent a substantial cost savings. Sluicing will be improved by raising the low intake wall. This wall raising was originaHy suggested by Bill Taggart of McLaughlin Water Engineers during a conference we held early during the assignment at his office. 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.