Water yield changes after converting a forested catchment to grass. Hibbert, A. R. 1969.
Water yield changes after converting a forested catchment to grass. [pdf]Paper  abstract   bibtex   
After a forested catchment was converted to grass, the amount of evapotranspiration was closely related to the amount of grass produced. During years when grass production was high, water yield from the catchment was about the same as or less than the expected yield from the original forest. As grass productivity declined, water yield gradually increased until it exceeded the predicted yield from the forest by over 5 inches annually. The grass appeared to evaporate more water early in the spring and less water late in the summer than the original forest cover.

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