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Show The Duty of Water in Cache Valley, Utah 3 The land that can be served from a given water supply has often been overestimated, causing severe material loss to many people. It is exceedingly important to the welfare, not only of the individual farmer but also of the community, that the exact facts be found. The first stage is to determine the extent of the water supply. The next step is to find how much land can best be served by this supply- not necessarily in extravagance, nor on a starvation basis, but on a basis of adequate prosperity for the largest number of farmers. WATER SUPPLY OF CACHE VALLEY The water supply of the western states has been made the subject of careful study on the part of various government and state agencies for a number of years. The hydrographic reports and the water supply papers of the U. S. Geological Survey are full of valuable information on the subject. The reports of the state engineers of the various states have additional information. As early as 1897 Dr. Samuel Fortier, Irrigation Engineer of the Utah Experiment Station, made a study of the water supply of Cache Valley. This was published as Utah Station Bulletin No. 50. Taken with the reports of the measurements made by the State Engineer and U. S. Geological Survey, it makes accessible rather exact data on the amount of water that is available for irrigation in Cache Valley. The present great need is for more exact information as to the proper area to serve with this wTater as well as the best methods of applying it. Since the water supply material may be obtained by any student of the subject it will not be repeated here. The following figures for the flow of Logan River are given to show how the typical streams of the valley decrease as the season advances. There is much more water available during the early part of the summer than later. This will of course determine the kinds of crops that can be raised. Table I. Flow of Logan River in Second Feet during June, July, August, and September. Average of 1U Years. ( From U. S. G. S. Water Supply Papers) ~ - - -~ I june | July I August | September Average~ Mean Flow 1... | TT23 j 566 j 3T9 j 279 ' Average Minimum Flow.. 767 [ 399 j 283 j 253 |