ABSTRACT
Evaluating the effects of future watershed change is even more difficult than evaluating the effects of change that has already taken place. In the latter case, some data, albeit nonstationary, are available. Where data are available at the site, some measure of the effect of change is possible, with the accuracy of the effect dependent or the quantity and quality of the data. Where on-site data are not available, which is obviously true for the case where watershed change has not yet occurred, it is sometimes necessary to model changes that have taken place on similar watersheds and then
a priori
project the effects of the proposed change onto the watershed of interest. Modeling for the purpose of making an
a priori
evaluation of a proposed watershed change would be a task simulation task.
