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I I I I I I I I I I I I I I I I I I I I. Repairing the deteriorated concrete; 2. Reconditioning the bay on the upstream end; 3. Installing additional bars on the trashrack; 4. Realigning the wasteway channel; 5. Installing a 10-foot Parshall flume and flow recorder at Wasteway No.2. The estimated cost for this work is $41,300 as outlined in Table B-3. 4O-foot Parshall Flume, Fort Lyon Canal. The 40-foot Parshall flume is located approximately one mile downstream from the lower diversion dam, and is the official point of measurement for the Fort Lyon Canal and the Kicking Bird Canal. The flume is o concrete structure with a timber floor covering and is equipped with a continuous flow recorder os well as a staff gage (see Photograph 5). The structure is in good condition with the exception of considerable wear of the timber floor. The original construction drawings of the flume show a concrete floor and we have assumed that the timber overlay was added after original construction. There have been some concerns expressed by some employees of the canal company regarding the condition of the timber floor and the possible need for repair. However, our investigations indicate that the present operation af the flume is satisfactory, and that repairs to the structure ore not necessary at this time. Steel Flume over Horse Creek, Fort Lyon Canal. The Horse Creek flume is located about 15.5 miles downstream from the lower diversion dam and is used to carry the Fort Lyon Canol water over Horse Creek. The flume consists of a I 23-inch diameter, 400- foot-long steel conduit supported on four steel bents, with concrete inlet and outlet structures, a concrete and masonry approach approximately 290 feet long, and a six-bay concrete regulator at the upstream end of the approach. There is also a five-bay concrete wasteway structure adjacent to the regulator. (See Figure 8 and Photographs 6, 7, and 8). Flow through the regulator is controlled by six adjustable steel check gates, and releases from the wasteway are controlled by five timber slide gates. Overflow gates are located at both the inlet and outlet of the flume to release excess canal flows into Horse Creek. The structure is presently operable, but the flume has a history of excessive wear and leakage, particularly along the invert. This is the result of high sediment concentrations in the canal water combined with high flow velocities through the flume. Under normal operating conditions, the velocity of the flow through the flume is estimated to be over 20 feet per second. In addition to the interior erosion of the flume, 23