The purpose of this appendix is to assemble available water resources data in a summarized form to provide information, not only for the agencies dealing with the management of the water resources of the region, but also for those planning the economic development which is dependent upon those resources. Much information about the water resources of the Columbia-North Pacific Region is available but it differs widely in character, scope, and geographic coverage and must be obtained from many sources. Information also is available on various water laws, technological developments, and economic and population trends that will influence the availability of and requirements for water in the future. The goal of water conservation is the management of this renewable natural resource to provide the optimum benefits from use of the water, now and in the future. To achieve this goal, intelligent planning and orderly development are needed. Proper planning and development require adequate information about the water resource and how man's activities have affected and are likely to affect it.

Evaluation of the land and minerals presents the productivity potential and the limitations and hazards inherent in the management and use of these resources.

The Land Measures and Watershed Protection Appendix shows current and projected watershed conditions, as affected by use of land and water resources, and presents requirements for improving and protecting the watershed through a combination of management practices, land treatment, and structural measures. The discussions are oriented around the four major land use and cover areas, cropland, forest land, rangeland, and other land, for each subregion. Measures and practices discussed in the appendix are primarily associated with water quality and use, conservation, irrigation, soil erosion, and drainage. Structures are primarily designed for flood protection, water quality control, and water use development.