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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />approach conditions. The main channel is generally stable, both upstream ad downstream <br />from the proposed structure location. A standard Replogle flume is recommended. below <br />which a plunge pool should be configured [0 provide bank protection, energy management. <br />and a smooth transition (0 the downstream conditions. Those objectives can be largely <br />achieved by proper riprap sizing and placement below a new structure. <br /> <br />The proposed new Structure allows for a one-foot thick reinforced concrete floor, with 8-inch <br />walls and wingwaIJs. Riprap and bedding material would need to be imponed [0 lhe site. and <br />any broken concrete riprap should be funher broken up sllch lhat the maximum dimension <br />is no greater than 3 times me minimum dimension. Riprap should be hand-placed over <br />bedding material to specified contours [Q provide the previously memioned hydraulic <br />objectives. <br /> <br />The flume was designed willI an 11.0 foot woat; hydraulic drop of 1.5 feet; maximum <br />discharge of 200 cfs al 3.0 feel of head; and a floor ramp heighl of 1.0 feel. The details of <br />llIe flume are shown on Figure 3. <br /> <br />Structure" - Check at 'VCR 49. The purpose of llIe structure is to provide water level <br />control for lUm-outs adjacent to and west of \VCR 49. The existing StruCnIre appears to have <br />been modified on at least two previous occasions. and is deteriorated beyond repair. Under <br />current operations. the maximum flow is estimated to be 200 cfs in the Owl Creek Lateral. <br />The struCnIre can easily be configured as a combination check-drop-measuring flume <br />inunediately downstream of llIe County Road 49 Bridge. <br /> <br />The structure is located on a relatively straight reach of llIe lateral, willI good approach <br />conditions. The main channel is generally stable upstream from llIe proposed Structure <br />location. Energy management and bank stabilization measures are required downstream. A <br />standard Replogle flume willI a 3-foot drop is recommended, below which a plunge pool <br />should be configured to provide bank protection, energy management. and a smoollI transition <br />to the downstream conditions. Those objectives can be largely achieved by proper riprap <br />sizing and placement below a new Structure. <br /> <br />The proposed new Structure allows for a one-foot thick reinforced concrete floor, with 8-inch <br />walls and wingwalls. Approach wall should extend 15 feet upstream, with new meter gates <br />installed to serve each of the two tum-oUlS. The downstream apron floor should extend 8 feet <br />downstream of the crest. Some additional riprap and bedding material would need to be <br />imponed to the site. and any broken concrete riprap should be further broken up such that the <br />maximum dimension is no greater than 3 times the minimum dimension. Riprap should be <br />hand.placed over bedding material to specified COmours to provide the previously mentioned <br />hydraulic objecti....es. <br /> <br />The structure was designed with an 11.0 foot woat; hydraulic drop of 3.0 feet; maximum <br />discharge of 200 cfs at 3.0 feet of head: and a floor ramp height of 1.0 feet. The details of <br />the flume are ShO"l1 on Figure 4. <br /> <br />Owl Creek Feasibility <br /> <br />Page 8 <br />