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<br />703 <br /> <br />ACTIVITIES OF ENGINEERING STAFF <br /> <br />I <br /> <br />The Engineering Staff has several continuing <br />activities on which records are kept up to date. One is the <br />annual check of irrigated acreage and storage in Jackson <br />County. <br /> <br />The original aerial photographs were made in 1937, <br />and the original map was made in 1940. Photography made in <br />1952 is now available, and large scale topographic maps are <br />being completed by the U. S. G. S. An engineer on our staff <br />is transferring our data to the new maps and photos. This <br />will facilitate the future field work in the area. Two men <br />will make the field check this year early in June. <br /> <br />Records of ditch diversions from the Arkansas <br />River are kept on a current basis. Also records of stream <br />flows and diversions in the San Luis Valley. The latter <br />are used to bring up to date the numerous relationships <br />which were studied and developed in our San Luis Valley sur- <br />vey, relative to uses and deliveries at the State line. <br /> <br />At present, work is being done on monthly deple- <br />tions of the Colorado River system by units of the Cliffs- <br />Divide Project above Glenwood Springs. We have completed <br />a study showing the effects of monthly transmountain diver- <br />sions presently having water rights on the flows of the Colo- <br />rado River at Glenwood Springs and Cameo. The period used <br />is 1934-1954, since this represents more than 20 years of <br />comparatively low flows. <br /> <br />The next step is to impose depletions by potential <br />projects mentioned in the Colorado Storage Project Act. to <br />determine total effects on stream flows for different condi- <br />tions of development. The Bureau of Reclamation estimated <br />the monthly depletions for the1929-1942 period. We are ex- <br />tending these for the later years. There are two men in <br />vacant positions on a temporary basis working on this study. <br /> <br />I <br /> <br />A member of the staff is recording diversions of <br />direct flow for various reaches of the South Platte River. <br />together with stream flows into the sections. going back <br />to 1928. The period 1928-1955 will include two groups of <br />years of very low flows. The figures will be analyzed. and <br />various methods of correlation employed to determine whether <br />there are any effects which might be attributed to increased <br />use of ground water. <br />