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Introduction 1 Description of study area 2 Previous investigations 2 Hydrologic studies 2 Cartographic studies 3 Approach used to delineate drainage areas and compute hydrologic characteristics ' Characteristics of test sites used to develop digital elevation models 5 Development, accuracy, and cost of digital elevation models 6 Development of computer programs used to process digital elevation model data 7 Procedure 1 8 Procedure 2 11 Procedure 3 11 Procedure 4 11 Procedure 5 14 Hydrologic characteristics 15 Depth, surface area, and storage volume relations 15 Comparison among test sites 17 Comparison among digital elevation models 18 Comparison of contributing and noncontributing drainage areas 19 Summary and conclusions 19 References 21 PLATE [Plate is in pocket] 1. Maps showing drainage-area boundaries and outlet elevations of subbasins in the James River basin, North Dakota, computed using digital elevation models developed from aerial photographs Contents III