Water resource planning should be objective oriented, must strive to search out as many alternatives as practicable, must be flexible to respond to changes in conditions, objectives, and values, and should be a continuous process rather than culminating in a single final plan. The methods of systems analysis were found to be applicable, and three models were considered. Two of these models, a demand model and a supply model for water withdrawal uses, appeared to be practical within the limits of data and time. The specifications for the demand model included consistent economic parameters, the separation of procedures for the economic and technologic assumptions, the separation of demands into broad water quality groups, the ability to aggregate data, the simplification of input data modification, the production of self-explanatory outputs, and complete control by the user of all the input and output functions. The specifications for the supply model included compatibility with the demand model, use of generalized cost curves for six supply categories, use of hydrologic and instream use constraints, and optimization by cost minimization.