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<br />( <br /> <br />proiect Summary <br /> <br />On May 22, 1985, the south outlet tunnel for Lake Loveland, <br />Loveland, Colorado, owned and operated by the Greeley and Loveland <br />Irrigation Company was inspected. The outlet tunnel is 60 inches <br />in diameter and was originally constructed in 1909. The existing <br />outlet tunnel consists primarily of brick and mortar. The State <br />Engineers Office determined that the outlet tunnel.was in poor <br />condition and that cavitation and progressive erosion downstream <br />of the g~tes structure has created a large cavern. The erosion <br />has become significant and warrants rehabilitation. Due to the <br />outlet tunnel erosion, lack of adequate spillway, and in the <br />interest of public safety the reservoir water level has been <br />restricted. In addition, no more than 75% of the historic rate <br />of flow is allowed through the gate structure (outlet tunnel) at <br />Colorado Avenue and any use of the outlet tunnel should be avoided <br />if possible. <br /> <br />Information gained from numerous inspections and design <br />studies confirm the recommendation that the upper section of the <br />outlet tunnel from the manhole between 10th and 11th Streets on <br />Colorado Avenue to the lake inlet be repaired in the near future <br />and that a new gate structure be constructed. The remainder of <br />the outlet tunnel through needing repair eventually, has been <br />deemed safe and satisfactory for current operating conditions. <br />In the meantime, it should be inspected regularly. <br /> <br />( <br /> <br />A lengthy review of the relining methods has narrowed the <br />choices to three basic methods: <br /> <br />1. Apply gunite to the internal wall Of the outlet tunnel. <br /> <br />2. Reline the outlet tunnel with high-density polyethylene <br />ribbed pipe (Spirolite) and pressure grout the annular <br />space. <br /> <br />3. Reline the outlet tunnel with coal tar or epoxy lined <br />steel pipe and pressure grout the annualr space. <br /> <br />The Lake Loveland outlet tunnel rehabilitation will have no <br />adverse affect on the irrigation system, water supply, fish or <br />wildlife, recreation, water quality control, or drainage. <br /> <br />It is the recommendation of the State Engineers Office as <br />well as the Greeley and Loveland Irrigat~on Company's engineer <br />that rehabilitation of the south outlet tunnel proceed as soon <br />as possible. With the ability of shareholders assessments and <br />revenue gained by sale of assets, the project is financially <br />feasible and will benefit the public safety and welfare. <br /> <br />( <br /> <br />i <br />