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<br />o <br />r- <br />~ <br />w <br />o <br />o <br /> <br />Surface Water Measurement <br /> <br />Irrigation water is distributed in the Reed Wash study area by 22 <br /> <br />laterals fed by the Government Highline Canal and 32 laterals supplied by the <br /> <br />Kiefer Extension of the Grand Valley Canal. Map lFl295-.417-808, page 45, <br /> <br />shows the location of the gaging stations on both systems. Quantity and <br /> <br />quality of surface water entering and leaving the study area were measured by <br /> <br />these gages and EC recorders. During 1976, diversions to most laterals were <br /> <br />measured by Parshall flumes. The remainder were measured with Price current <br /> <br />meters or estimated by judgment. After construction diversion will be <br /> <br />measured with permanent flow meters. This will allow the same intensive data <br /> <br />collection that was used in 1976 to gather information for the Definite Plan <br /> <br />Report (1980). <br /> <br />Additional Preproject Monitoring <br /> <br />Administrative Waste <br /> <br />Administrative waste or spillage is high in Grand Valley because canals <br /> <br />are operated at or near full capacity throughout the irrigation season <br /> <br />because of the lack of canal control structures. Excess flows are spilled <br /> <br />directly into drainageways and returned to the river. <br /> <br />Canal spills in the Reed Wash study were determined by flow measurements <br /> <br />above and below the Kiefer Extension spills at Reed Wash plus Peck and Beede <br /> <br />Wash. Lateral spills in the Reed Wash study area were estimated by measuring <br /> <br />selected laterals. <br /> <br />9 <br />