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<br />1059 <br /> <br />EVALUATION OF OXFORD FARMERS SYSTEM WATER SUPPLY <br /> <br />In summary, water is available to lands under the Oxford Farmers <br />Ditch from three sources: direct diversions from the Arkansas River, company- <br />owned well~ pumping directly into the ditch and shareholder-owned wells from <br />which water is applied directly to the lands. Unused water in the ditch is <br />returned to the Apishapa River. Measurements or computations of all quanti- <br />ties involved permit a determination of water applied to the land for 1968- <br />1970 irrigation seasons. The tabulation follows: <br /> <br />Item <br /> <br />Headgate diversion <br />Company wells <br />Ditch supply <br />Ditch and lateral losses <br />(approximately 19%)** <br />Available for lands <br />Spilled unused to the <br />Apishapa <br />Shareholder wells <br />Distributed to lands <br />Farm Losses (25%)** <br />Available to meet crop <br />requirement <br /> <br />19,490 <br />1,360 <br />20,850 <br />-4,010 <br /> <br />16,840 <br />-2,190* <br /> <br />5,230 <br />19 , 880 <br />-4,970 <br />l4,910 <br /> <br />Available to meet crop <br />requirement (6000ac) <br /> <br />2.48 <br /> <br />Precipitation <br /> <br />Total <br />Gross consumptive use <br />Deep percolation <br /> <br />0.43 <br />2.91 <br />-2.40 <br />0.51 <br /> <br />1968 <br /> <br />1969 <br /> <br />1970 <br /> <br />ac-ft <br />" <br /> <br />24,250 <br />240 <br />24,490 <br />-4,710 <br /> <br />ac-ft <br />" <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />ac-ft <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />*Partly estimated <br />**Losses as estimated by the U.S. Bureau of Reclamation and explained in the <br />following paragraph. <br /> <br />ac-ft <br />" <br /> <br />22,880 <br />560 <br />23,440 <br />-4,510 <br /> <br />" <br />" <br /> <br />" <br /> <br />19,780 <br />-5,920 <br /> <br />The U. S. Bureau of Reclamation for the Fryingpan-Arkansas Project <br />computed the monthly water requirements of the Oxford Farmers Ditch for years <br />1928-65. They used the Lowry-Johnson method and the Thornthwaite distribution <br />to compute monthly gross consumptive use (as explained earlier). The effective <br />precipitation was calculated using a method in which percentages of effective- <br />neSS are applied to increments of monthly rainfall ranging from 95 percent ef- <br />fectiveness for the first inch to zero effectiveness for amounts in excess of <br />6 inches per month. The crop irrigation requirement was determined by subtract- <br />ing the effective precipitation from the gross consumptive use. The headgate <br />diversion requirment for a full water supply waS determined by adding the trans- <br />mission losses to crop irrigation requirement. The values used by the Bureau <br />for ditch, lateral and farm losses are 15%, 5% and 25%, respectively. In equa- <br />tion form <br /> <br />HDR'" <br /> <br />100 x (GCU - <br />x (100 - LL) <br /> <br />(100 - CL) <br /> <br />" <br />" <br /> <br />" <br /> <br />18,930 <br />-4,350 <br /> <br />" <br /> <br />" <br /> <br />3,250 <br />17,830 <br />-4,460 <br />13,370 <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />ac-ft/ac <br /> <br />2.23 <br /> <br />" <br /> <br />0.89 <br />3.12 <br />-2.40 <br />0.72 <br /> <br />" <br /> <br />" <br /> <br />EP) <br />x (100 <br /> <br />- FL) <br /> <br />- 19 - <br /> <br />" <br /> <br />" <br /> <br />2,920 <br />16,780 <br />-4,200 <br />12,580 <br /> <br />" <br /> <br />" <br /> <br />" <br /> <br />ac-ft/ac <br /> <br />2.10 <br /> <br />" <br /> <br />0.69 <br />2.79 <br />-2.32 <br />0.47 <br /> <br />" <br /> <br />" <br />