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Water Riqhts Direct flow water rights controlled by the Riverside Ditch & Allen Extension Company (RD&AEC) were appropriated in 1872 through 1888. The RD&AEC diverts its water from the Arkansas River at the river diversion and headworks of the canal. Direct flow right appropriation dates and amounts are as shown in Table 1. Table 1. Summary of Riverside Ditch direct flow water rights. Adjudication Date Appropriation Date Amount (cfs) June 19, 1890 February 22, 1882 0.95 June 19, 1890 August 9, 1883 9.00 June 19, 1890 July 6, 1888 16.00 January 19, 1904 November 1, 1872 3.00 Historic annual diversions from 1946 are shown as tabular data in Appendix B. The average annual diversion is approximately 3250 AF over the period of record. Structural Evaluation and Physical Condition In August 2009, the full extent of the Riverside Ditch & Allen Extension Co. (aka Riverside Ditch or RDS�AEC) system was toured and documented by Stephen Smith and Roger Stauffer, the Company's ditchrider. This study section documents the general character, structures, and general physical condition of the ditch. River Diversion The Riverside Ditch diversion on the Arkansas River can be generally described as a dike (aka "wing wall") of rock material that causes a portion of the river flow to be channeled toward the west bank of the river and then downstream toward the Company's slide gate and Parshall flume. At higher river flows, water moves down the channel but is also partially lost through the rock dike and back to the river. If sufficient flow to meet the Company's intended decreed flow reaches the slide gate, then water is brought into the beginning of the ditch. If there is more water diverted than required, stop logs can be removed to allow a portion of the diverted water to be wasted back into the river. Aqua Engineering, Inc. Riverside Ditch 8� Allen Extension Co., Feasibility Study October 2009 - 3 -