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00 ..::'~ ~ C'" 1;;..~.'i' ~*-~ D f'\'ll'~ 'i:' c for these stations with the exception of Station 1117, All-American Canal, are furnished each month. The records for Station 1117 are furnished to Imperial Irrigation District and to Reclamation on a yearly basis. The USGS hydrographers take flow measurements from a cableway located at the downstream end of the California Sluiceway Channel below Imperial Dam every 2 weeks. The flow measured at the cableway includes the discharge through the California Sluiceway gates and the sludge discharge from the All-American Canal Desilting Basins. The USGS reports the flow above Imperial Dam as the sum of the flow at Station 60, All-American Canal, Station 30, Gila Gravity Main Canal and the flow below Imperial Dam. The flow below Imperial Dam is the total of the flows through the California and Gila Sluiceways, return flow from the All-American Canal Desilting Basins, an estimate of flow from the seepage pond below the overflow weir, and the diversion to Mittry Lake. USGS hydrographers once each month. the flows at these measure the diversions to the Reservation Division USGS has assumed the responsibility for reporting stations. Diversions to Siphon Drop Powerplant are reported by the USGS and flow measurements are made at a station on the Yuma Main Canal below the powerplant. Since the .powerplant was taken out of service in late 1972, all diversions to the Yuma Main Canal are made from the forebay through the bypass gates. The gates are rated and are equipped with a recorder to show the gate opening. The Yuma County Water Users' Association also provides the USGS with a record of the gate opening. The delivery to the Valley Division through the Colorado River Siphon is reported by the USGS. A water stage recorder is installed at the intake and at the discharge end of the siphon; the discharge is computed by using the differential-head method. The recorders are serviced and maintained by the USGS. The flow in the Yuma Main Canal below the siphon is measured by the USGS hydrographers once every 2 weeks as a check on the rating curve for the siphon. Listed below are points of diversion from the All-American Canal to the Yuma Project and the method of measurement: Location Type of Measurement Reservation Main (All-American Canal, Station 308) Titsink Lateral (All-American Canal, Station 381) Yaqui Lateral (All-American Canal, Station 586) Pontiac Lateral (All-American Canal, Station 586) Siphon Drop Turnout (All-American Canal, Station 775)* Hualapai Turnout Siphon Drop Powerplant Calibrated Gate Parshall Flume Parshall Flume Parshall Flume Computed Cipolletti Weir Rated Gates *Diversions diversions powerplant. at Siphon Drop Turnout are computed as the sum of the through the Hualapai Turnout and the flow through the 14