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1 Geologic formations and general groundwater conditions--Continued Introduction. . • . • • . • . • . . • • • • . . . • • • . . . • . 1 Location and extent of area 1 Alluvium •••.. ·.•..••..•.•••• 8 Purpose and met~ods of investigation. 1 Hydrologic factors affecting drainage.. 8 Previous investigations 2 General conditions 8 Acknowledgments. • . • • . • . • • • • • • • . • • • • • • 4 Natural surface drainage 9 Well-numbering system 4 Natural subsurface drainage  •'•. 12 Geography. . . • • . . • . • . . • • • • . • • . . • • . • . • . • • 5 Source of water 12 Climate 5 Hydrologic properties of the princiLand use 6 pal aquifer . · • • •• • 17 Topography 6 Quantity of water 18 Geologic formations and general groundSuggested methods of drainage 20 Quality of the water 22 Summary and recommendations 24 Selected bibliography 24 water conditions 7 Fort Union formation 7 Terrace deposits 7

Ground-water factors affecting the drainage of Area IV, First Division, Buffalo Rapids irrigation project, Montana