the rainfall in forestry areas The rainfall, and hence water yield, can vary quite markedly from place to place even within a quaternary catchment, especially in the montane areas where many plantations are situated. We had expected that plantation areas...
.5 for the wetter primary catchment X and 2.5 for the whole country. Differences of this sort are particularly marked in the Letaba River system (second- ary catchment B8). Here afforestation of only 3.6% of the land area results in a reduction of 8...