Laserfiche WebLink
<br />1-" <br />~~ <br />t,j <br />~ <br /> <br />~~ <br /> <br />3. Description of Revised Plan for Laterals <br /> <br />. <br /> <br />The designs and cost estimates for the piping of the project <br />laterals involved collecting elevations from aerial photos, <br />obtaining capacity information from the UVWUA, completing field <br />examinations, and using this information to determine appropriate <br />pipe sizes. The designs allow the velocity of the water in the <br />pipe to range between 4 feet/second and 12 feet/second. <br />Approximately 4 feet of head will be provided at each turnout to <br />allow for the use of gated pipe. Therefore, additional salinity <br />benefits may be obtained through coordination of on- and off-farm <br />facilities. The Department of Agriculture (Agriculture) is <br />currently implementing an on-farm salinity control program in the <br />project area. However, before claiming such benefits, one should <br />note that Agriculture has a voluntary mitigation program, and any <br />connection of the improvement plans outlined in this document <br />with their program may carry with it additional mitigation <br />requirements to cover insufficient voluntary participation. In <br />addition, NEPA compliance may become more complicated. <br /> <br />It was determined that the option of using gravity pipeline <br />is the most desirable from both an economic and operational <br />standpoint. Pipelines less than 12" diameter will be placed in <br />PVC pipe, with the remaining larger sizes as concrete pipe. <br /> <br />For the purpose of this report, laterals were assumed to be ~ <br />piped, in general, in their existing alignment. As the detailed <br />design process takes place, opportunities will be identified <br />where laterals can be shortened by crossing fields and changing <br />alignments. For the laterals under the South Canal and the Selig <br />Canal, opportunities were identified where possible reductions in <br />length could take place. These opportunities have been <br />considered in the preliminary design process as an example of the <br />types of reductions that will take place in the actual project. <br />Limited SO/JU Study funding, and this being a feasibility level <br />report prevent identifying all opportunities. In general, the <br />cost of the proposed construction program could drop <br />significantly when all available opportunities for reduction in <br />pipe length are considered. Therefore, the costs estimates for <br />pipe presented in this documen~ are conservative. <br /> <br />New measuring devices will be installed on all of the <br />turnouts. The UVWUA will construct Parshall flumes of concrete <br />or sheet metal. <br /> <br />The potential for gravity fed sprinklers was evaluated, and <br />it was determined that the areas that have the required elevation <br />available for sprinklers do not have a suitable type of soil for <br />sprinkler applications, and the areas with suitable soils do not <br />have the required elevation. According to the SCS's on-farm <br />program personnel, there is minimal public desire for sprinklers. .. <br /> <br />10 <br />