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I I I I I I I I I I I I I I I I I I I water in their system. This is needed to ensure each stockholder is delivered the correct amount of water and to allow the operation of the to be on a sound water management basis instead of by .. fee'''. h is difficult to operate the system without an experienced ditch rider that is use to making multiple adjusonents throughout the system to balance the water coming into the system with lhe water !.hat should go out. EXISTI:\G FACILITIES The existing facilities includes eight miles of supply ditch known as the Owl Creek Ditch and shown as the Eaton Ditch on existing topographic maps, and four miles of supply ditch known as the Branch. and various checks, drops. and other control structures. The existing control slIUctures in the ditch are severely deteriorated and in general are of no use [0 measure or camral me ditch. The work to be conducted includes the repair of many of the major structures on lhe ditch and the installation of the measuring weirs at the headgates. The map in Appendix A shows the control structures that will be modified, rehabilitated. or replaced and also shows (Wo of the different type of delivery systrems at the headgares that must be measured. Photographs 1,2,4, 6, 7,8, 9, 10, and lion the map in Appendix A show the control structures that were detennined to be necessary to operate the system. Several other structures are located along the ditch and have been used in the past but were not deemed as necessary and were not evaluated. At most of these locations a Replogle Flume (ramp flume) will be installed in the floor of the structure to allow measurement of flow on the main ditch. This type of flume is easy to retofit to an existing structure and is easy to construct and read. Appendix F contains some infonnation on this flume induding a rating table. Photographs 5A and 5B show the typical delivery systems used to convey water from me headgates lO me fields. Most of the headgares provide water to an open ditch as shown in 5A rhat usually have deteriorated measuring weir to allow a determination of flow. There are several locations where the water is supplied to a pump pond as shown in 5B that feeds a center pivot irrigation system. No method of flow measurement is presently in place at these locations. At this time the center pivots are few compared to the number of headgates. However, the number is expected to increase with time and has increased dramatically in the past few years. There are currently 40 headgates on the Owl Creek ~lain and 25 headgates on the Branch. There are fewer headgates at the present time than in the past as several of the headgates on the system have been abandoned. ALTEIL'iATlVES EVALUATED During our study of the Owl Creek System. we evaluated the following alternatives: I) No action alternative, 2) Complete rehabilitation of system. and 3) Rehabilitation of selected structures and/or components. Following is a summary of our assessmem of each alternative. Owl Creek Feasibility Page 4