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An investigation of runoff from a 4.64‐acre agricultural watershed included the use of subplots, observation wells, and piezometers to determine the extent of source areas of storm runoff within the catchment. Studies of data collected showed that most of the storm runoff usually originates from a small portion of the total drainage area and that the location and extent of the source area is dependent upon rainfall intensity, antecedent moisture, and the depth of the A horizon soil.
Betson et al. (Sun,) studied this question.