53:171 Water Resources Engineering
Problem #1
Long Term Annual Water Balance


Evaluate the long-term water balance for four rivers around the world.

Iowa River
at Wapello
Amazon River
Brazil
Yangtzekiang River
China
Ob River
Russia
Watershed area (km2) 32,3727,180,0001,970,0002,950,000
Precipitation (mm/yr) 83817771120563
Streamflow (cms) 227190,00035,00012,500

  1. Compute the mean annual evapotranspiration (in mm/yr).
  2. Compute the runoff coefficient (annual river discharge as a fraction of precipitation) (in %).

Last changed on 01/07/14 by Gabriele Villarini.