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<br />Larimer and Weld Irrigation Co.
<br />September 14.15, 2004
<br />
<br />Agenda Item 4e
<br />
<br />and the Big Windsor inlet is the only way the reservoir can be filled. Use of the Finley check cannot
<br />be maintained without significant repair to the structure and its foundation.
<br />
<br />Alternative 2, Repair existing structures, while less expensive than the replacement alternative,
<br />has several disadvantages. The structures if repaired would have a shorter lifespan than new
<br />structures, and would need complete replacement in 25 to 30 years. The new structures would be
<br />expected to last on the order of 100 years with repair on the gates and controls required every 25
<br />years, All structures would need significant demolition, repair and stabilization work on the existing
<br />concrete (walls, slabs, etc.) No improvements in operational efficiency would be achieved with the
<br />repair alternative using stop logs for checks, and the addition of gates to old check structures is not
<br />feasible due to the condition of structure walls and lack of reinforcing steel in walls and slabs.
<br />Further, all structures need energy management to retard further erosion of the base slabs and the
<br />channel downstream of the structures, In addition to repairs, the Lake Lee Dam needs a measuring
<br />device downstream and the Big Windsor Inlet needs a measuring device for flows into the reservoir.
<br />
<br />Alternative 3, Replace al/ structures with new concrete structures and control gates, consists
<br />of total replacement of the existing structures with new concrete structures, incorporating energy
<br />management features to control downstream erosion, installing effective gates for the control of
<br />flows, and installing measuring flumes. The new Finley structure will be 25 feet wide, with a
<br />manually operated Obermeyer gate. The new Lake Lee structure will be 60 feet wide, 125 feet
<br />long, and about 15 feet deep, with 2 radial gates to control flows, an overflow spillway and a
<br />Parshall flume downstream. The new Big Windsor structure will be 40 feet wide, 220 feet long, with
<br />depths varying from 15 to 35 feet below grade. The check will have two manually operated
<br />Obermeyer gates to divert water into the reservoir inlet, and the inlet will have 4 control gates, a
<br />converging section with a Parshall flume, a 35' high drop structure and a 115' foot long discharge
<br />pipe.
<br />
<br />Selected Alternative 3, Replace al/ structures with new concrete structures and control
<br />gates, was chosen. LWIC does not feel the other two alternatives provide for an increase in
<br />operational efficiency of the system, and this alternative allows the system to operate at its
<br />maximum capacity and allows for better measurement and control of ditch flows. The new
<br />structures would be expected to require little maintenance over the life of the loan and would have a
<br />longer lifespan than repaired structures,
<br />
<br />Total Project cost is estimated to be:
<br />1 , Construction Cost
<br />2, Contingency@ 18%
<br />3, Engineering Fees
<br />TOTAL
<br />
<br />$1,238,000
<br />223,700
<br />205,000
<br />$1,666,700
<br />
<br />The implementation schedule calls for replacing the structures over a 3-year period as follows:
<br />
<br />Design
<br />Start Construction
<br />Finish Construction
<br />
<br />Finlev
<br />10104
<br />2/05
<br />4/05
<br />
<br />Lake Lee Dam
<br />4/06
<br />9/06
<br />4/07
<br />
<br />Bia Windsor
<br />4/05
<br />9/05
<br />4/06
<br />
<br />Financial Analvsis
<br />
<br />The total estimated cost of the project is $1,666,700, and LWIC water is used exclusively for
<br />agricultural purposes, Staff is recommending a maximum loan amount of $1 ,500,000 (90% of the
<br />estimated project cost) for 30 years at an interest rate of 2.50%, LWIC will provide the additional
<br />$166,700 (10%) through an increase in assessments on shares of stock.
<br />Page 3 of 5
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