Contour Trenching Vs. Irrigated Plantations De Novo De Novo

The amount of runoff water, which can be held up for the benefit of a forest crop is only limited by the size of the contour trenches, the intensity of the rainfall, and its annual total. In regions of fair rainfall, the extra amount which can thus be held up, is much greater than the amount ordinarily available for irrigated plantations in arid regions, owing to severe competition with agricultural crops. In these circumstances and also owing to their more favourable environment, contour trenched forests are likely to be, on the average, more luxuriant and more efficient as focal points for moisture condensation.