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<br />flO" 'I ,,? <br />...., l)"Ll)w <br /> <br />. <br /> <br />rights do not have sufficient water physically available. Even though <br /> <br /> <br />there are 1347 cubic feet per second of senior water rights upstream <br /> <br /> <br />from the Liddle Ditch, because of the return-flow phenomena that ditch <br /> <br /> <br />may be able to divert at times only 100 cubic feet per second is flowing <br /> <br /> <br />by the Balzac gage. <br /> <br />. <br /> <br />The most junior appropriation date shown on Table 4 (June 14, 1897) <br /> <br /> <br />has specific importance because of the compact between Colorado and <br /> <br /> <br />Nebraska on the South Platte River. According to terms of the compact, <br /> <br /> <br />if during the period between April 1 and October 15 of each year the <br /> <br /> <br />flow at the Julesburg gage falls below 120 cubic feet per second, the <br /> <br />compact puts a "call" on rights which are junior to that date within the <br /> <br /> <br />Balzac to Julesburg reach in Colorado, As can be seen from the table, <br /> <br /> <br />some 1550 cubic feet per second of direct-flow rights in this reach are <br /> <br /> <br />senior to the compact date; so, in general, the rights junior to the <br /> <br /> <br />compact are usually out of priority when the streamflow at Julesburg <br /> <br /> <br />drops below 120 cubic feet per second. About six ditches in the lower <br /> <br /> <br />30 miles of this reach are the principal ones influenced by the compact <br /> <br />terms. <br /> <br />Existing Efficiencies <br /> <br />Field and farm irrigation efficiencies <br /> <br />The field irrigation efficiencies and farm system irrigation effi- <br /> <br /> <br />ciencies are most accurately determined for an area by actual field measure- <br /> <br /> <br />ments. In an attempt to find what data were available and what efficiencies <br /> <br /> <br />might be expected for the area, the following people were contacted. <br /> <br />(1) Mr. Floyd Brown, Colorado State University, retired. Mr. <br /> <br /> <br />Brown was Extension Irrigation Specialist and worked for many years in <br /> <br />the study area. <br /> <br />. <br /> <br />(2) Mr, Brice Boesch, Soil Conservation Service. Mr. Boesch is <br /> <br /> <br />Irrigation Engineer for the study area and works out of the Denver office. <br /> <br /> <br />He has had extensive experience on the Welton-Mohawk project (Arizona) <br /> <br /> <br />on studies which are related to irrigation efficiencies and irrigation <br /> <br /> <br />efficiency improvement. <br /> <br />-25- <br />