Mississippi River at Clinton, Iowa.

Mississippi River, at Clinton, Iowa.

POWER SPECTRUM OF DAILY FLOWS > 10 years 1 year 6 months

Post-1940 minus Pre-1940 Variables Daily Flow Monthly Precip. Monthly Temps.

Phase (solid) And Amplitude (dashed) Of monthly average St.Dev. Of Monthly Average Annual Cycle Phase (solid) And Amplitude (dashed) Of monthly average Flows, Mississippi, Clinton, Iowa. Semi-Annual Cycle Phase of Annual Cycles of Precip. (solid) and Temps. (dashed

RECONSTRUCTED FLOW CHARACTERISTICS 1880-1890 (solid) and 1980-1990 (dashed). Standard Deviates of Mean Annual Flow

CHANGING PROBABILITIES OF DATES OF MAXIMUM AND MINIMUM FLOWS. Heavy = All Light = post-1940 Dots = Pre-1940 Post Pre Jun Jul Apr-May Oct-Nov Pre Pre Post Aug-Oct Dec Jan-Feb