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C153770 Feasibility Study
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C153770 Feasibility Study
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Last modified
4/18/2011 2:34:54 PM
Creation date
10/5/2006 11:50:27 PM
Metadata
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Template:
Loan Projects
Contract/PO #
C153770
Contractor Name
Summit Reservoir and Irrigation Company
Contract Type
Loan
Water District
32
County
Montezuma
Bill Number
SB 97-008
Loan Projects - Doc Type
Feasibility Study
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1 <br />, <br />l� <br />' <br />' <br />' <br />, <br />, <br />, <br />l� <br />' <br />, <br />, <br />' <br />� <br />2. Lost Canyon Diversion - The Lost Canyon diversion structure is a lazge concrete structure <br />across the bottom of Lost Canyon that includes a weir section about 100 feet long, a slide gate for <br />sluicing and a radial gate for the outlet into the ditch. Additional rip rap needs to be placed on <br />the downstream side of the structure near the sluice gate and some of the gabion baskets need to <br />be repaired. <br />3. Rail Road Siphon - The Rail Road Siphon is a 4 foot diameter, 680 feet long, 129 cfs, wood <br />stave pipe with concrete inlet and outlet structures. Staves in the siphon have been replaced over <br />the past few yeazs in order to maintain operation but as the wood ages the need for complete <br />replacement becomes more acute. Either lining using the "Insituform" process (see the Summit <br />Dam outlet pipe lining) or replacement with buried steel or reinforced concrete pipe is <br />recommended. The SCS design is based on installation of three buried 30 inch diameter PVC <br />pipes to replace the wood pipe; the inlet and outlet structures would also be replaced. <br />12. (same location as 3.) Rail Road Siphon Safety Measures - Due to increased hiker use of the <br />ditch, safety devices aze recommended at the inlet to the Rail Road siphon. The safety measures <br />might include fencing, an emergency floating cable and exit ramp so that a person could pull <br />themselves from the ditch before entering the siphon. The safety measures aze recommended on <br />the existing siphon but would be incorporated into the design of the siphon replacement. <br />4. & 5. Line Sections of Lost Canyon Ditch - The Lost Canyon Ditch is only 4 miles long but <br />traverses very steep hillsides. In 1993, about a 800 foot section of the ditch failed due to <br />excessive moisture, the repair involved moving the ditch into the hillside further so that the <br />downhill slope was flattened but the uphill slope is very steep with rocks and debris commonly <br />falling into the ditch. There is also a second section of the ditch with a similaz problem. The <br />SCS design included installation of azch CMP (6 foot height) in two 400 foot sections of the <br />ditch. The installation of lazge azch CMP is costly so as an altemative, Summit will investigate <br />general upgrading of the ditch to provide better maintenance access and flattening of the uphill <br />slopes to reduce the debris plus other options to convey water from the headgate to Summit <br />Reservoir. The cost estimate included herein is for the installation of the CMP which is adequate <br />for either option. <br />6. Improve Conveyance System from Summit to Puett Reservoirs - The SCS design is based on <br />installation of a second outlet from Summit Reservoir on the west portion of the embankment to <br />release up to 50 cfs of water into an existing creek that flows into Puett. There are serious <br />problems with this plan because of erosion to the existing channels, safely caaying water throagh <br />the small creek, and enlazging the road culverts; Summit will investigate other options to <br />improve the conveyance between the reservoirs. <br />' 7. Wallace Drop Structure - The Summit Ditch has eroded about 34,000 cubic yazds of material <br />which not only impacts the cropland on the Wallace property but sediment is conveyed to <br />downstream water users. The SCS looked at two designs: a drop structure or replacing the ditch <br />' with a pipeline azound the azea. The preferred option is to install a pipeline azound the azea that <br />would be 21 inch diameter to convey 19 cfs a distance of about 2,200 feet. <br />' <br />' <br />n <br />
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