C150060A Feasibility Study - Laserfiche WebLink

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Project Description and Alternatives The purpose of this project is to provide a means for the JID to continue delivery of irrigation water to shareholders while minimizing the possibility of a future failure of their diversion structure. Three alternatives were considered: 1. The no-action alternative. 2. Repair the existing drop structure and construct a new radial gate control in the ditch. 3. Construct a new drop structure and new radial gate control structure. Alternative No.1, no-action, was considered unacceptable since it could lead to failure of the drop structure and inability of the JID to deliver water to its shareholders serviced by the Peterson Ditch. Alternative No.2, Repair the existing drop structure and construct a new radial gate control in the ditch, was ruled out because the repair cost of the drop structure alone would exceed 50% of the new construction cost. In addition, the downstream end of the structure is in very poor condition and may not be repairable at all. Alternative No.3, construct a new drop structure and new radial gate control structure, was selected since it is considered to be the least costly reliable approach. The selected alternative, Alternative No.3, consists of constructing a new 12 foot drop chute spillway that drops flood flows from the Peterson Ditch to the Lodgepole Creek, and construction of a water control structure on the Peterson Ditch. The control structure on the Peterson will control flows down the ditch beyond the spillway and will incorporate a 3-foot slide gate to direct water into a cutthroat flume to measure augmentation flows. The spillway structure will replace an existing one, and will be very similar to Structure Nos. 7,8,9,10 and 11 on Floodway NO.1 Phase II of the Sedgwick Sand Draws PL-566 Watershed. All walls will be 12" thick and reinforced accordingly. Gates include a 15' lay down gate on the spillway, and a 12' radial gate and a 3' slide gate on the Peterson control structure. The District plans to install automated controls on the lay down gate to regulate the water level in the Peterson Ditch and prevent flooding damage. The Sterling Office of the Natural Resources Conservation Service (NRCS) has prepared a Preliminary Engineering Report and a cost estimate for the project. The report and cost estimate are included in Appendix D. The estimated cost of the full project is $145,000. The cost breakdown is summarized in Table 1. Table 1. Julesburg Irrigation District - Diversion and Pipeline Project - Cost Estimate Item Quantitv Unit Unit Price $ Amount $ NRCS Desi(:m 1 Job $11,000 $11,000 Reinforced Concrete 125 c/v 350 43,750 ReinforcinCl Steel 15,000 Lbs. 0.60 9,000 Sheet Pilina 1,600 S.F. 7.00 11,000 DewaterinCl/Structure removal L.S. 7,000 7,000 Gates and Hoists 3 Ea. 26,000 Earthwork-Ditch AliClnment 4,000 C/V 5.00 20,000 Continaencv at 15% Job 17,000 Total $145,000 Julesburg Irrigation District Peterson - Lodgepole Control Structures November 2000 (Updated January 2001) Page 9 of14