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<br />I <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />Alternative No. 2 - Concrete Lined Ditches <br /> <br />Unreinforced concrete lined ditches have been used in many locations throughout <br /> <br /> <br />Colorado. The Erkenbeck lateral which takes off from the Farmers Irrigation Ditch <br /> <br /> <br />is concrete lined. A good example of a major canal that has a concrete lining <br /> <br />is the Consolidated Home Supply Ditch. This ditch is five (5) miles north of the <br /> <br />Highland Lateral and Farmers Ditch. This ditch has some problems due to the im- <br /> <br /> <br />proper construction of a foundation but, basically does a good job. Sections of <br /> <br />ditch that were not constructed properly are now deteriorating and require repair. <br /> <br />Other sections were installed properly and appear to be holding up well. We esti- <br /> <br />mate that 'a properly installed concrete lined irrigation ditch will have a minimum <br /> <br /> <br />life span of fifty (50) years. <br /> <br />To insure a maximum life span, we believe that the ditch should be designated <br /> <br /> <br />and constructed with the following considerations, some of which have already <br /> <br /> <br />been mentioned: <br /> <br />1. Proper Foundation: The only' way that a ditch can be expected to <br />have a long life is if a proper foundation is built. A good foun- <br />dation must be properly shaped and the soils, when properly com- <br />pacted, must be of a. toype which w;lll not .experience large amounts <br />of expansion and contractions. Adequate surface drainage must be <br />provided to prevent water from being trapped behind sidewalls and <br />expanding when frozen. <br /> <br />2. Proper Concrete Construction: The concrete mixture must be such <br />that it can endure winter's freeze and summer's wear. We believe <br />that the minimum compressive strength of the concrete should be <br />3,000 p.s.i. and that air entrainment be specified. The amount <br />of air entrainment should be specified by the design engineer <br />and Type II cement should be used. <br /> <br />The proper design of the foundation should be based on the evaluation of an ex- <br /> <br />perienced soils engineer as previously mentioned. Alternative No. 2 has a pro- <br /> <br />tected construction cost estimate of $2,600,000. To arrive at this figure, we <br /> <br />have researched construction companies* and material suppliers* and previous cost <br /> <br /> <br />estimates: <br /> <br />* 1. Colorado Ditch Liners Company <br /> <br /> <br />2. Pink Wilson Ditch Company <br /> <br />3. Hydro Construction <br /> <br />4. Carder Concrete Company <br />5. Hydro Conduit Company <br /> <br />28 <br />