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<br />- 20 - <br /> <br />Distribution System Rehabilitation.- Since the 1870's and l880's <br />when the present system was developed, the main canal structures have <br />been replaced several times and have been repaired many times. Most <br />of the structures now needing replacement are those built shortly <br />after World War I. See photographs showing watershed problems on <br />Plates A and B following Page 13. <br /> <br />Measuring devices of many types are in use along the canal. <br />These devices will be replaced with Parshall measuring flumes in <br />order to provide uniform and accurate measurements of water delivered <br />to all users from the main canaL <br /> <br />The program of rehabilitation of the canal system provides <br />needed canal realignment and for the replacement of existing struc- <br />tures with more efficient types of standard and special structures. <br />These are divided into three groups for construction purposes. <br /> <br />Group A.- Major accomplishments in the cost savings of irriga- <br />tion canal relocations, replacement of structures, and management <br />are achieved by the combining of irrigation structures on the lower <br />slopes of the two floodwater-retarding structures. Structure PR-2 <br />replaces old wooden flume No. 15 on the Pine River Canal and a fairly <br />new siphon of the Spring Creek Ditch Company with a 670 lin. ft. <br />canal realignment section having a lined concrete section of 270 lin. <br />ft. Estimated cost of installation is $21,332. Structure PR-l <br />replaces wooden flume No. 20 on the Pine River Canal in like manner <br />with a canal realignment of 340 lin ft. having a concrete-lined <br />section of 70 lin. ft. Estimated cost of installation is $6,405. <br />Total estimated cost of installation of Group.A is $27,737. Group A <br />will be constructed as part of the two floodwater-retarding struc- <br />tures PR-l and PR-2, and will no longer be referred to separately. <br />(See Figure I) <br /> <br />Group B.- These are the major canal structures to be replaced <br />on the Main Pine River Canal and the South Branch of the Pine River <br />Canal except for those in Group A. Minor structures consisting of <br />headgates and Parshall .flumes along these canal sections are included <br />in Group O. The structures in Group B have no useful life remaining <br />and are for the most part deteriorated wooden structures. <br /> <br />Waste drop No.4 is a wooden waste overfall lined with light <br />sheet metal just downstream from the Spring Creek Canal division <br />