Forecasting Coquitlam River Basin, British Columbia

TitleForecasting Coquitlam River Basin, British Columbia
Publication TypeConference Proceedings
Year of Conference2008
AuthorsSolano, C. V.
Conference Name76th Annual Western Snow Conference
Series TitleProceedings of the 76th Annual Western Snow Conference
Date PublishedApril 2008
PublisherWestern Snow Conference
Conference LocationHood River, OR
KeywordsRunoff forecasting, rain on snow, BC Hydro, Coquitlam River, UBC watershed model

Rain-on-snow events during warm periods with high precipitation amounts can produce high floods. Due to the complexity of the process, predicting run-off during these events is difficult and current conceptual hydrologic models are believed to simulate rain-on-snow events only very poorly. The inability of conceptual hydrologic models to simulate rain-on-snow events correctly may eventually translate into a greater risk adopted into BC Hydro's operations. For this purpose, hydrologic simulations and forecasts of several rain-on-snow events for the coastal Coquitlam watershed, British Columbia, Canada, were selected for analysis. In the first part of this study, the ability of the UBC Watershed Model to simulate Coquitlam Reservoir inflows during rain-on-snow events using observed precipitation and temperature data as model input was investigated using various performance measures. In the second part of this study, performance measures for hydrologic forecasts for the selected rain-on-snow events were calculated and the forecast skill determined.