Using the WINWRNSHYD program as a didactic tool

TitleUsing the WINWRNSHYD program as a didactic tool
Publication TypeConference Proceedings
Year of Conference2005
AuthorsSwanson, R. H.
Conference Name73rd Annual Western Snow Conference
Series TitleProceedings of the 73rd Annual Western Snow Conference
Date PublishedApril 2005
PublisherWestern Snow Conference
Conference LocationGreat Falls, MT
KeywordsWRENSS, WRNSHYD, WinWrnsHyd, snow accumulation, forest management, peak flow changes

The WinWrnsHyd computer program is a complete implementation of the hydrology section of the USEPA WRENSS procedure plus some additional routines related to forest growth. As such its principal use has been to estimate the changes in water yield associated with forest management activities. However, it is not limited to this use. Forest harvest affects water yield by altering evapotranspiration, the differential accumulation and retention of snow, the timing of snow melt, the intensity of harvest, and the speed of vegetative regrowth. The WinWrnsHyd model simulates the magnitude of each of these factors and integrates the net result to give an estimate of annual water yield. Hydrologists often examine each of these factors in isolation and it is not always clear what magnitude of the effect that each one has on the integrated whole.