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<br /> <br />Develooment of the Yuma Main Canal <br />Water Loss Distribution Sheet <br /> <br />The Yuma Main Canal Water Loss Distribution Sheet (WLDSl calculates the nuaber <br />o <br />CO> of acre-feet diverted by users on the Yuma Main Canal at Siphon Drop (see <br />c:) sample WLDS following). These calculations generate the share of the total <br />o <br />-J canal seepage loss (A.F. Loss) to be attributed to each user at its delivery <br />iol:lo point(s). then add each of these loss shares to the corresponding delivery for <br />each user (A.F. Diverted) to arrive at the water actually diverted by the user <br />at Siphon Drop (A.F. Diverted at Siphon Drop). Diversions calculated here for <br />Siphon Drop then become deliveries at Siphon Drop for these users and are. in <br />a similar manner on the All-American Canal WLDS. recalculated with other <br />deliveries to arrive a~ ~he diversion to be charged each user at its legal <br />point of diversion near Imperial Dam. <br /> <br />Unless noted otherwise, a WLDS for monthly accounting uses United States <br />Geological Survey (USGS) provisional listings or data furnished by Yuma <br />Projects Office (YPOl on a monthly FAX report. A WLDS for a yearly <br />accounting, unless otherwise specified, uses USGS final listings for the year <br />or data used by YPO in its yearly hydrographic tabulations. The sample WLDS <br />was done on Lotus 1-2-3, and has been maintained in the historical format for <br />continuity. <br /> <br />The sample sheet has 31 numbered lines for reference with the following: <br /> <br />Line 1 - From left to right. the next to last column has the entry for the <br />total flow diverted at Siphon Drop in cfs; the rightmost column shows this <br />value in acre-feet. Flow values may be obtained from the USGS provisional and <br />yearly listings. and are currently included on a monthly FAX report from YPO. <br /> <br />Line 2 - This line gives the water spilled at California Wasteway (officially <br />named Yuma Main Canal Wasteway - see Line 27l. It is parenthetically shown <br />as a scheduled flow. indicating that it is water scheduled to be returned to <br />the river for an operational purpose and is not. as shown on Line 3. excess or <br />was1:e. <br /> <br />Prior to 1988. discharges below 100 cfs at the Yuma Main Canal Wasteway were <br />generally computed by the USGS from a stage-discharge relation. flows above <br />100 cfs were generally computed as the difference between the discharge of <br />Yuma Main Canal at Siphon Drop and Yuma Main Canal below the Colorado River <br />siphon. with deductions for deliveries made along the canal. Because flows <br />since 1988 have been almost exclusively higher than 100 cfs. the USGS has used <br /> <br />4 <br />