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<br /> <br />o <br />C) <br />c.':) <br />o <br />(.Q <br />..... <br /> <br />neveloDmen~ of ~he Gila Gravitv Main Canal <br />Water Loss Distribution Sheet <br /> <br />The Gila Gravity Main Canal Water Loss Distribution Sheet (WLDS) calculates <br />the number of acre-feet diverted by users on the Gila Gravity Main Canal at <br />Station 30 at Imperial Dam (see sample WLDS used by YPO that follows). The <br />computa~ional rationale is similar to that described for water loss <br />distribution on the AAC and the Yuma Main Canal. The format, developed by <br />YPO, is slightly different. but still incorporates the same general <br />computational approach. The legal point of diversion for the users listed on <br />the sample Gila Gravity Main Canal (GGMC) WLOS is Imperial Dam at Station 30. <br /> <br />Line 1 - ~~e value entered here is the to~al wa~er diver~ed at Imperial Dam. <br />Station 30. ,(uSGS Station 09522500) into the GGMC. Flow values may be' <br />obtained from the USGS provisional and yearly listings. Monthly values are <br />currently included on a monthly FAX report from YFO. <br /> <br />Line a - The total water delivered along the canal is the total for Column 2 <br />on the WLDS. This total does not include the Wasteways-Spill (310 acre-feet) <br />or the Wasteway Leakage (268 acre-feet). This WLDS notes 'no loss computed as <br />wasteway :':ows are included in total losses'. By not computing seepage losses <br />for these spatially identified wasteway flows and assigning these losses and <br />flows to one 'or more "diver~ersn, these seepage losses and wasteway flows are, <br />in effect. distributed to the users in the same manner as are the seepage <br />losses on ~he Yuma ~ain and the AAC. The assumption underlying the loss <br />'ealcula~ions on the Yuma Main and the AAC is ~bat losses occur uniformly as <br />the water ~=avels down ~he canal. or. more precisely. seepage loss is a <br />func~ion or the dis~ance the water flows only. :he nwas~eway =!ow~ losses <br />wh~ch are distribu~ed to the users on ~he GGMC do not occur uniformly as the <br />water flows ~own the canal, hence there is no longer a physical basis :or <br />~haring the losses according to the acre-feet miles concept as is done on ~he <br />Yuma Main an~ the AAC. Distribution of the 'wasteway flow losses' by the <br />current procedure say not be acceptable to all users. Although the GGMC is <br />maintained by the users in a .cooperative manner. it is not known if agreement <br />on the curren~ procedure exis~s. <br /> <br />-In June 1982. a contract was administered for the transfer of the operation <br />and maintenance (OaM) of the Gila Canal System from Reclamation to the five <br />irrigation dis~ric~s lis~ea on this WLDS. Since that time. the districts have <br />been responsible for the OaM of the Gila Canal System. The OSH of the system <br />is performed by Well ton-Mohawk ana Yuma Mesa. The other districts reimburse <br />these two aistricts for their respective portions of incurred OSH costs. <br /> <br />17 <br /> <br />