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<br />~$.~ <br />i>",~;;r~ <br />~~? <br />!j/' <br />,.... <br />~::.~: <br />,:::f' <br />0> <br />~ <br />~".. <br /> <br />,~.,"'M080 <br /> <br />~': <br /> <br />developing a water budget for each sUb-district, areas of low <br />efficiency can be detected and analyzed so that improvement <br />measures can be applied. By the same procedure, areas of high <br />efficiency can be identified and analyzed so activities and <br />condi tions contributing to this increase can be discovered and <br />applied to areas of low efficiencies. <br /> <br />Preparation of a water budget for a sub-district also assists the <br />ditch ,rider in reducing or eliminating operational spills of <br />"mismatched" water. Mismatched water is water the ditch rider <br />requested delivered to his sub district that is excess to the <br />amount of water needed to fill orders. Operational spills are also <br />being reduced through efforts of each ditch rider to organize the <br />schedule of deliveries to users in his sub-district so that total <br />demands do not fluctuate radically from day to day. A computer, <br />program was developed to help a ditch rider predict the amount of' <br />water needed in future days based upon the demand for the last <br />three days and historical data. <br /> <br />Identifying and stopping use of water to irrigate non-water righted <br />land and delivery of water above the court decreed water duty are <br />two areas where savings can be made. Use of water 'above court <br />decreed water duty occurs when a user has water rights for an area <br />larger than the area actually irrigated, but orders and 'receives <br />water for the entire amount of land water righted. For example, if, <br />a user has 40.4 ha (100 acres) of waterriqhted land he would be <br />entitled to 431.7 thousand m', (350 acre-feet) of water for <br />irrigation purposes for a 4;317 m' (3.5 acre-foot) per .4 ha (acre) <br />water duty. However, he may only farm 32.3 ha (80 acres) of his <br />land and so should only receive 345.4 thousand m (280 acre-feet) <br />of water. Since he has 40.4 ha (100 acres) of water right he may <br />attempt to have the district deliver the entire 431.7 thousand m' <br />(350 acre-feet) of water and apply it to the 32.3 ha (80 acres) he <br />is actually irrigating. This gives him a water duty of 5,427 m' <br />,(4.4 acre-feet) per .4 ha, (acre) which exceeds the 'court decreed <br />, amount. <br /> <br /> <br />~:~ <br />'~ <br />~; <br />.. '1 <br />.;..' <br />~..'.~ <br />'.~1 <br />;-~'~,:' <br />.' <br />~! <br />(... . <br />~ . <br /> <br />I <br /> <br />I <br /> <br />In order to identify and stop these two practices, the Bureau,of <br />Reclamation is using satellite images and aerial photography. A <br />satellite image and colored slides of the project, which ideatifies <br />'irrigated areas, are taken several times during the irrigation <br />season. Tbese images are then used with computer maps showing the <br />boundaries~f each users water rights and boundaries of each field. <br />From this merging of data, improper irrigations can be identified <br />and the hectares (acres) actually irrigated in each field can be <br />determined. The hectares (acres) actually irrigated are then <br />multiplied by the water duty for that land to determine the total <br />amount of water the user is entitled to. This amount is compared <br />with the amount shown on the district records as actually being <br />delivered. It is then determined which users received more water <br />than they are entitled to. To correct these problems and conserve <br />water, the district will stop deliveries of water to lands with no <br /> <br />8 <br />