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.', - ',.y', united states Department of Agriculture soil Conservation service 4304 W. 9th st.' Rd. Greeley, Co. 80634 303-365-7835 Date: January 26, 1996 To: Bruce Lindahl, Area Conservationist PRELIMINARY ENGINEERING REPORT Name of Project: Bravo Ditch Diversion structure Written by: Lynn Lovell Job Classification: Greater than V Field Office: Sterling Soil Conservation District: South Platte County: Logan Recommended: Area Engineer date Administrative Approval: Area Conservationist date 1. JOB TYPE, SIZE, PURPOSE AND PROGRAM The Bravo Ditch serves about 990 acres. There are 11 cooperators that use this ditch water. The diversion structure in the river is almost none functional and if it fails these cooperators will have no way to get their water next summer. This project would repair tne diversion stru~ture in the South Platte River that serves the Bravo Ditch. It was pretty much washed away in this spring's floods, a ten year event or about 18,000 cfs. The concrete diversion structure was undermined by flood waters. One wing wall and about forty feet of the floor collapsed into the hole. The inlet gate part of the structure wasn't damaged by the flood, but it is old and deteriorated. The diversion across the river to an island is estimated to be about 180 feet long. Pa~t of the structure may be salvagable. The bad part snould be saw cut off and removed. It is suggested that a row of sheet piling be placed along the face of the structure. The bad part of the structure would then be rebuilt on tOl) of "R" pilings. A sand embankment would be tormed on the west end of the diversion dam, at the direction of the ditch company. This would act as a relief valve, in that it would wash away if too big a flood came througn the area. It would have to be replaced from time to time.