1. What is the runoff ratio for the Red River at Grand Forks? (Completed in class.)

2. How does a long-term decrease of 0.5 inches in the current basin-wide average yearly precipitation (from 17 to 16.5 inches) affect the average discharge? (Completed in class.)

3. Assignment --- Rearrange the Wigley & Jones relationship (derived in class .... not on a ppt) to find out how much evapotranspiration needs to decrease to keep the river flowing at the same average discharge, given the decrease in precipitation.

Average discharge of the Red River at Grand Forks (since 1905) = 3,084 cfs

Contributing drainage area = 26,300 square miles

Average basin-wide precipitation = 17 inches