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Show The climate in these mountain valleys is cool but not harsh. Summers are short and cool; winters, although long, are not usually severe. Precipitation varies with the altitude, and most of the precipitation falls during the winter. Although the valleys receive an average of 15- 20 inches of precipitation per year, less than 8 inches falls during the period May- September, which includes the growing season. The distribution of normal annual precipitation and normal May- September precipitation are shown on plate 1. Previous studies and acknowledgments Previous hydrologic studies in the area have been confined to the collection of basic data, primarily streamflow records, and to local studies of ground- water and surface- water conditions in connection with reclamation projects. The streamflow records are summarized in reports of the U. S. Geological Survey ( 1954, 1960, 1961- 68, 1963, and 1964), the annual reports of the Provo River Commissioner ( 1945- 68), and the annual reports of the Weber River Commissioner ( 1929- 68). Data collected in connection with various construction and irrigation projects were available from the files of the U. S. Bureau of Reclamation in Provo ( Provo River drainage basin) and Ogden ( Weber River drainage basin). Many geologic studies have covered parts of the Heber- Kamas- Park City area, and more information is available on the geology of the Wasatch Range than on that of the Uinta Mountains. In general, however, references to the water- bearing properties of the rocks are few and scanty. The writer has drawn on many sources for the geologic map and descriptions in this report; those sources are listed in the references. Much of the information on wells and springs in the area came from the files of the Utah State Engineer. Nearly all the subsurface data came from well drillers' reports on file with the State Engineer, and additional information was obtained from well drillers who were working in the area during the time that fieldwork was in progress. Special thanks are due to the citizens of the area and to the officials of the towns who freely answered many questions about their water supplies and gave permission to measure water levels in their wells. SURFACE- WATER HYDROLOGY The Heber- Kamas- Park City area includes parts of the upper drainage basins of two major streams- the Provo River and the Weber River. The discussion of the surface- water hydrology of the area, accordingly, is divided into separate discussions of the two drainage basins. Provo River drainage basin The Provo River rises on the south side of the Uinta Mountains, near the west end of the range, and flows generally westward to the vicinity of Hailstone, in the north end of Heber Valley ( fig. 2). From Hailstone, the river flows southwestward through Heber Valley and the narrow lower Provo Canyon to Utah Lake. At some earlier time, the Provo River near Francis flowed northward through Rhodes Valley and joined the Weber River near Peoa. Both the shape and orientation of Rhodes Valley ( fig. 1) and the presence of lineations on the surface of the valley fill north of Francis ( almost 5 |