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Chapter 2 - Plan of Development I I I I I I I I I I I I I I I I I I I primarily gravity flow, except where hydraulic conditions dictate that pressure pipe may be used. Pipe sizes would range from 6 to 42 inches in diameter. Pipe would generally be installed along existing lateral and canal alignments. However, realignments and combinations would be incorporated as previously discussed in the section entitled "Scope of Recommended Improvements." Representative alignment changes are included in this report for the laterals under the South, Selig, and East Canals and are discussed further in subsequent descriptions of the individual systems. These changes reduce lateral system mileage by about 14 miles for the recommended improvements. Further reductions in the overall length of the lateral systems can be expected during the preparation of detailed designs along with improvement in the efficiency of the water deliveries. The combining of laterals or realignments for efficiency purposes may require new easements. Additional rights-of-way (i.e., temporary construction and permanent O&M easements) would be obtained by Reclamation and UVWUA personnel in negotiations with the landowners. The cost estimates have assumed that the landowners receiving project water would donate needed rights-of-way. Other landowners who do not receive project water would be reimbursed for rights-of-way. During preconstruction planning, a relatively detailed analysis examined the feasibility of incorporating a facility to manufacture concrete pipe similar to that constructed and used by the Shoshone-Heart Mountain Irrigation Districts near Cody, Wyoming. Originally, the use of a pipe manufacturing facility was thought to result in significant cost savings over pipe purchased from commercial suppliers. With concrete pipe as the major cost item for the project, its cost has significant implications in the overall cost effectiveness for the project. In the analysis, alternate local commercial prices were obtained, preliminary plans and costs for a pipe plant were developed, and the most cost-effective combination of PVC and concrete pipe was determined. The analysis also determined the sizes of pipe which could be economically manufactured. Analysis of the pipe plant concept introduced potential competition into the local market. Only one concrete pipe manufacturer is located within 250-300 miles of the project site, and their price quotes for several pipe sizes were reduced when the pipe plant concept was analyzed. Currently, there would not be sufficient monetary savings to warrant the construction of a concrete pipe manufacturing facility as part of the project. However, this could change, and the construction of such a facility should be maintained as an option, at least until a long-term contractual arrangement could be developed to guarantee price levels for pipe consistent with the manufacturing facility option. 12