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<br />I <br /> <br />A paper entitled 'Methods for controlling <br />the ground-water regime--exploitation and con- <br />servation' was presented at a meeting of the <br />International Union of Geodosy and Geophysics at <br />Berkeley, California. This paper summarizes the <br />results of the pilot study on the relation of <br />ground water to surface water in the Arkansas <br />Valley in the 25-mile study reach between La <br />Junta and Las Animas. It indicates that con- <br />sumptive use of water in the area increased con- <br />siderably in the past several years concurrently <br />with the development of ground-water. This fact <br />suggests a relationship and changes in agricul- <br />tural practices indicating an increase in consump- <br />tive use. The data are insufficient to distin- <br />guish the effects to each one of these elements. <br />However, it is rather definite that the effects <br />are there and can be pretty well tied down. The <br />budget analysis also indicates that the off- <br />stream reservoirs that are presently in use are <br />an inefficient way of storing water due to the <br />excessive evaporation from the reservoir surface. <br /> <br />In other areas of the investigation the <br />analysis of the data indicates the extent of non- <br />beneficial consumptive use by phreatophytes can <br />be reduced somewhat by the installation of large <br />capacity wells in an area that is now covered <br />with phreatophytes, particularly salt cedar. The <br />investigation is being conducted by the Survey in <br />cooperation with your Water Board and Colorado <br />state University. <br /> <br />I <br /> <br />Several changes will be made in the stream <br />gaging network in the state during this fiscal <br />year. The following gaging stations will be <br />discontinued on september 30th unless there is <br />sufficient interest to provide financial support <br />from some other source. There are six stations <br />that have been in the Water Board program that <br />will be dropped, primarily because the stations <br />were operated to collect information for the <br />Bureau of Reclamation investigations in connec- <br />tion with project development. Other stations <br />will be installed to provide similar data for <br />areas of new project study. The stations that <br />will be dropped from the Water Board program this <br />