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I I I I I I I I I I I I I I I I I I I Page 57). Minor concerns include the surface corrosion and leakage of the bifurcation gates and safe access to the gate hoists. Also, some means of measuring the flow at the basin outlet would be beneficial. The rehabilitation of the control basin and bifurcation structure (not including weed and trash control, see Page 57, and flow measurement, see Page 54) involves the following work: I. Reconditioning the steel gates; 2. Installing a walkway on the bifurcation structure across the Fort Lyon Canol directly downstream of the radial gate. The estimated cost of this work is $5,300, as given in Table B-9. Measuring Flume at WheatridQe Lateral. This flume is located at the end of the Fort Lyon Calal as it enters the Wheatridge Lateral. It is approximately 110 miles downstream from the lower diversion dam and measures the water leaving the Fort Lyon Canol System and entering the Wheatridge Lateral. The flume is a concrete structure and is equipped with a continuous flow recorder and a stoff gage (see Photograph 14). The only problem with this structure is a build-up of sediment in the stilling well, which causes erroneous water level readings. A piping system intended to remove sediment from the stilling well is presently in place, but is inoperable. It is doubtful that such a system could provide reliable long-term service, and it would appear that periodic inspection and cleaning of the stilling well would be a more efficient procedure. It is estimated that the cost of cleaning the stilling well is minimal and should be included In the regular canal maintenance. Lateral Headgates and Measuring Flumes. Fort Lyon Canol. As previously mentioned, the Fort Lyon Canol releases water into about 200 laterals throughout its length. In order to provide efficient and equitable water distribution, it is the responsibility of the Canal Company to install and maintain headgates and measuring flumes at each of these laterals. It is estimated, however, that about 20 headgates and 20 measuring flumes are presently in need of repair or replacement. Those headgates which are determined to require replacement should be replaced with an equivalent size slide or sluice gate with al integral frame and handwheel operator. It is estimated that the average cost to rehabilitate the lateral headgates is about $1,550 each. Measuring flumes should be replaced with Parshall flumes of equal or greater capacity. The new flumes should be manufactured from galvanized steel or fiberglass 34