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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />rollover structure. Considerable expense was incurred to try to block the Tremont <br />diversion ditch so that Lower Platte and Beaver could receive their water during the <br />growing season of 1995. <br /> <br />At the present time the Tremont system is unusable. The large headgate and tube used <br />to control the Tremont diversion is completely washed out and has been destrpyed. <br />The Tremont and Snyder Smith systems asked Cecil J. Osborne, PE and Bart <br />Woodward to assess their situation and to make recommendations to most economically <br />get the system back into operating condition. <br /> <br />POSSIBLE SOLUfIONS: <br /> <br />Several solutions have been considered, including replacing the tube and headgate much <br />as it was before. This is not considered a viable solution for a couple of reasons: <br /> <br />1. Due to the height of the rollover diversion dam, there would be no way to <br />prevent the next flood from going North through the Tremont ditch and again <br />washing out everything. <br /> <br />2. The old system constantly drew sand into the Tremont ditch which if not <br />removed by mechanical means on a regular basis would completely block the <br />Tremont diversion ditch and render it useless. <br /> <br />It is our recommendation that a new structure be constructed to eliminate much of the <br />sanding problems which has plagued the system for years. The structure needs wing <br />walls high enough to be able to withstand a flood without overtopping the structure. <br />The structure could be protected with a dirt and rip-rap fill which would not be washed <br />away by a similar or larger flood. The diversion canal would probably suffer damage <br />in a future tlood because the water must go north around the rollover but the new <br />structure can be protected. <br /> <br />Due to high water levels present in this area of the Platte, the cost of construction will <br />be higher than for a similar structure built on dry ground. During construction, the <br />area must be dewatered and sheet piling driven into the river bed to give the new <br />structure a good foundation. The structure will be constructed of heavily reinforced <br />concrete attached to a 5 foot diameter tube. The tube will be 40 feet in length and <br />covered with dirt to an elevation sufficiently high to protect it from any future flood. <br />Instead of a headgate, boards will be used to regulate water into the canal. This design <br />will allow water to be taken over the top of the boards to minimize the amount of sand <br />that can enter the canal. <br /> <br />Total cost of putting the system in acceptable condition for the 1996 irrigation season <br />will be in excess of $35,000. The cost of construction of the new structure is estimated <br />at $24,000 with the additional $11,000 necessary to clean and repair the diversion <br />canal. <br /> <br />3 <br />