February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.
The River Basin Model is a man-machine simulation model used to delineate the interactions taking place, within a real or hypothetical area, between the local water system and the economic, social, and governmental activities of that area; it is a model of an entire regional system, with water a subsystem realistically interacting with all the other major subsystems, such as transportation and housing. A gaming format is employed, and Model users provide inputs to the computer programs which simulate the major processes. The functions of the computer are presented, and the computer printed output is described in detail. The computer stores and updates all relevant statistics for the area, simulates the actions of the outside systems (such as a national business cycle), and performs certain routine, otherwise time-consuming processes (such as calculating a comprehensive water quality index).