Abstract
Debris flow frequency and magnitude were determined for 33 basins in southwest British Columbia. Basins were first classifiedaseitherweathering-limitedortransport-limitedusingadiscriminantfunctionbasedondebris-contributingarea, an area-weighted terrain stability number, and drainage density. Multiple regression was used to predict magnitude, peak discharge, frequency and activity (frequency times magnitude) within each group of basins. Model performance was improved by stratifying the total sample of debris flow basins into weathering-and transport-limited groups. Explained varianceincreasedbyanaverageof15percentinthetransport-limitedsample,indicatingthatsedimentsupplyconditionsin themoreactivebasinsarefundamentalinpredictingdebrisflowactivity.Anindependenttestoftheregressionmodelswith 11basinsyieldedgenerallygoodresultsfordebrisflowmagnitudeandpeakdischarge.Predictionofdebrisflowfrequency provedproblematicalinweathering-limitedbasins.Themethodsdevelopedhereprovideestimatesofdebrisflowattributes in basins for which few data on past events are available. Copyright # 1999 John Wiley & Sons, Ltd.
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