MAPPING RUNOFF BY THE GRID SQUARE TECHNIQUE

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.