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I I I I I I I I I I I I I I consists of a set of radial gates (structure 6) to shut off the flow into the Owl Creek Supply Ditch, a concrete spillway waIJ upstream of the gates. and a radial gate into Owl Creek. This set of strucrures is very important to the system to reduce the flood potential and the resultant damage that would OCcur to the ditch and property owners downstream of the ditch. The Structures are in fair condition. The radial gates need some minor maimenance and repair and the spillway structure is in good condition and does nO( require any modifications or repair. The only major repair work required to mainlain these Structures in good working condition is some repair of the concrete walls that suppon the [wo radial gales in the ditch as shown on the photo of Structure 6. The concrete is cracked and spalled on the bottom portion of the support walls and the construction joint between the walls and base slab is eroded. There is some bank cutting on the upstream side that will erode the wall backfill with time if left unchecked. The concrete on Structure 6 should be repaired by chipping out the defective concrete and replacing with a nonshrink grout. The base slab [0 wall joint should also be chipped back [Q sound concrete and repaired with grout. The maintenance on the gates consisLS of lubrica[ing the lifts and pulley shaft and repairing the cables. The single radial gate to Owl Creek is being lifted by only one of its two cables and it is twisting the gate and its frame. We did nO[ analyze the hydraulic capacity of the system or the required capacity as this was beyond the scope of work for this study. Also included in the cost at this location is the work associated with the installation of a measuring flume. This will allow the Company to determine the total flow into their system including water from Owl Creek. Currently they can only measure the water from the Eaton Ditch and can nO[ determine the Owl Creek flows. Head:;!'3te Flow l\leasurement Most of the headg:nes discharge into an open ditch that is directed onto the irrigated fields or into a pond that is used [Q supply feeder ditches or a center-pivot sprinkler system. As proposed herein. all headgates that supply open ditches will be measured using a cur-throat flume as derailed on Figure 10. All headgates supplying center-pivot systems will be measured using a meter gate as shown on Figure II. Structure 5A - Cut-Throat Flume. The cut-throat flume was chosen for measurement of flows from !.he headgate [Q ditch application due to its simplicity and low head loss through the structure. The floor of the flume is flat and is easier to construct than a Parshall flume. The head losses through the flume are less than a weir and the cut-throat flume can accurately measure submerged flows. The flume can easily be made OUI of precast concrete and transported [Q the site and set in place. Owl Creek Feasibility Page 13