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Evaluating peak flow sensitivity to clear‐cutting in different elevation bands of a snowmelt‐dominated mountainous catchment

A hydrologic model of the mountainous snowmelt‐dominated Redfish Creek catchment (British Columbia) is used to evaluate Interior Watershed Assessment Procedure (IWAP) guidelines regarding peak flow sensitivity to logging in different elevation bands of a basin. Simulation results suggest that peak flow increases are caused by greater snow accumulation and melt in clear‐cut areas while similar evapotranspiration rates are predicted under forested and clear‐cut conditions during spring high flow. Snow accumulation and melt are clearly related to elevation, but the relationship between logging elevation and peak flow change is more complex than perceived in the IWAP. Logging in the bottom 20% of the catchment causes little or no change in peak flow because of the small low‐elevation snowpack and the timing of snowmelt, while clear‐cut area alone appears to be a good indicator of peak flow increases due to logging at higher elevation. Temporal variability in peak flow changes due to clear‐cutting is substantial and may depend more on temperatures during snowmelt than on the size of the snowpack. Long‐term simulations are needed to improve quantitative estimates of peak flow change while the importance of watershed topographic characteristics for snowmelt and peak flow generation must be further examined.