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i, <br />, , EXISTING FACILITIES <br />'�' The Supply Irrigating Ditch Company and the Brand Company are interested in the rehabilitation <br />of Knoth Reservoir which is currently in a state of disrepair. The reservoir has never held water <br />except for a short period of time in the 1970'S when a trial iill was attempted. The reservoir was <br />reported to have leaked considerably and was thus drained. The dam was never completed to the <br />satisfaction of the State Engineer and the reservoir was restricted to zero storage. A letter from <br />the State Engineer was sent to the Brand Company in 1985 advising the follow actions had to be <br />taken prior to the reservoir being filled. <br />1. Complete riprap placement. <br />2. Fill in ditch on the crest of the north dam. <br />3. Finish the secondary outlet on the north dam or remove the short piece of pipe that <br />now exits and backfill/repair the area according to specifications. <br />4. Prepare as-built drawings of the dam upon completion of construction. <br />5. Survey elevations of the crests of the embankment and the spillway to verify <br />freeboard and relative elevations of the crests. <br />6. <br />7. <br />E:� <br />Submit documentation on how the south dam outlet was sealed off. <br />Design means to solve the seepage problem which was noted in the early 1970'S <br />during a trial filling of the reservoir. <br />Perform a hydrologic study to verify adequacy of the spillway west of the south <br />dam as it now exists. <br />Photographs 1 through 4 in this report show the condition of the dam at the current time. As <br />outlined above and as can be seen in the photographs, the dam is in need of repair and completion <br />of its major components. <br />ALTERNATIVES EVALUATED <br />During our study of Knoth Reservoir and Dam, we evaluated the following alternatives: <br />1) No action alternative, 2) Complete rehabilitation of the two dams to Gage Height 20 feet, and <br />3) Complete rehabilitation of the two dams to Gage Height 25 feet, and 4) Complete <br />rehabilitation of the two dams to Gage Height 30 feet. Following is a summary of our assessment <br />of each alternative. <br />No Action Alternative. <br />One course of action considered was to not purchase the reservoir and maintain the operation of <br />the ditch at its current capacity and use. The ditch has been operated in its current state for a very <br />long time and can be operated this way in the future. However, the need is apparent for some <br />storage within the system to increase the usable yield and to a11ow for more efficient operation of <br />the ditch. Based on this need, the SIDC decided to continue pursuing their options to buy the <br />reservoir and secure some storage for their system. <br />Knoth Reservoir-Feasibility Study Page 6 <br />