FLOW AND TEMPERATURE MODELS FOR THE FRASER AND THOMPSON RIVERS

High river temperatures have been linked to pre-spawning mortalities i n salmon returning to their natal streams. As a first step in predicti ng these temperatures, flow, and temperature models were developed for the Fraser and Thompson Rivers in British Columbia. The flow model is essentially pre-calibrated while the temperature model was calibrated against data collected in 1993 and then verified against data from 19 94. Root mean square differences between measured and calculated tempe ratures were found to be 0.70 degrees C at thirteen stations in 1993 a nd 0.60 degrees C at fifteen stations in 1994. As a purely speculative exercise, the models were then used to investigate the feasibility of using cooler waters from lakes to reduce the warm temperatures record ed in 1994.