In 1997 (the dry year), Axis 1 accounted for 42% of the variance and was related to temperature, TON and flow. Axis 2 accounted for 2% of the variance and was related to DO, BOD, TON, chloride and SRP. In 1998 (the wet year), Axis 1 accounted for 3% of the variance and was related to SRP. Axis 2 accounted for 1% of the variance and was related to DO, BOD and flow.