Runoff is a difficult variable to map because the information from river gauging stations only indicates average runoff from the catchment area above the gauging point. A method of mapping runoff by grid-based extrapolation of two components of the water balance equation (evapotranspiration and precipitation) and application of a runoff model in each grid square, is suggested as a means of overcoming many of the problems related to runoff mapping.
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Research Article| August 01 1975
ANGELA M. FOYSTER; MAPPING RUNOFF BY THE GRID SQUARE TECHNIQUE. Hydrology Research 1 August 1975; 6 (4): 207–221. doi: https://doi.org/10.2166/nh.1975.0014
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