Studies on water resources in the last few years have had the tendency to encompass larger and larger areas. The increase in size and sophistication of these studies makes the use of computers almost mandatory. To adapt computers to this type of study, the study area must be converted to a schematic representation which is easily manageable by computers. A simple and reasonable way of doing this is to cover the study area with a square grid, which may then be considered as consisting of a matrix of squares. This system can be used to store, process, and retrieve information and may have numerous applications in the fields of hydrology, hydraulic power, economics, etc. The paper presents the application of the square grid system to the estimation of the precipitation, temperature, and runoff distribution in a large area and shows how the use of the system enables efficient combination of the meteorologic and hydrologic information available in assessing the precipitation, temperature, and runoff distribution. An example of such a computation for a 43,000‐square‐mile area is shown and the advantages of the method over the usual techniques emphasized.
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Solomon et al. (1968) studied this question.