Hydrologic Impacts of Silvicultural Activities

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Abstract
Most pollution associated with silvicultural activities has a nonpoint source and is difficult to control by conventional methods. Process-oriented techniques have been developed to allow the planner, engineer, or hydrologist to evaluate the impact that any proposed silvicultural activity will have on the hydrology of the planning unit. Changes in the hydrologic processes stimulate changes in non-point source pollution. As a part of the effort to quantify hydrologic impacts, the country was broken into five hydrologic regions. Hydrologic models were fitted to representative baseline watersheds in each region. Process stimulation was then used to develop response coefficients to be used to modify the regional baseline levels of evapotranspiration (ET), soil water, and streamflow as a function of cover, soil depth, aspect, latitude, and position in the watershed. This presentation summarizes the results of the efforts and presents an evaluation of the usefulness of the methodology.

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