As demands upon available water supplies increase, there is an accompanying increase in the need to assess the downstream consequences resulting from chances at specific locations within a hydrologic system. This problem was approached by electronic analog simulation of the hydrologic system. The complexity of a hydrologic model depends to a large extent upon the magnitude of the time and spatial increments utilized in the model. The increment size selected depends upon the types of problems to be solved. Three models are described, and in each succeeding model the definition in terms of time and/or space is improved. While the problems as its predecessor, it is also capable of solving many additional problems which require a higher degree of definition. Preliminary verification studies for both the second and third models have shown close agreement between observed and computed discharge hydrographs from prototype basins.
Riley, J. Paul and Chadwick, Duane G., "Application of an Electronic Analog Computer to the Problems of River Basin Hydrology" (1967). Reports. Paper 125.