After the substitution of stereo for horizontal orifices of rain gauges on open steep slopes, the mean network catch in a subbasin with prevailing windward exposure was increased by 11%. In a subbasin with leeward exposure it was increased by only 4%. The mean network catch of ground level stereo gauges corrected for wetting losses was about 17% greater than that of elevated gauges with horizontal orifices. There was little difference between the mean network catch of ground level stereo gauges in the two subbasins. The isohyetal map from the data of these gauges was less complicated than the map drawn from the data of elevated gauges with horizontal orifices in the same subbasin.

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