In this April 30, 2013 photo, a device called an acoustic Doppler 

In this April 30, 2013 photo, a device called an acoustic Doppler current profiler is tethered to the side of a boat and used to take stream flow measurements and river depth readings on the Red River in Fargo, N.D. Even with reams of data, forecasting a flood is still an imprecise science. (AP Photo/Dave Kolpack)
Associated Press
In this April 30, 2013 photo, a device called an acoustic Doppler current profiler is tethered to the side of a boat and used to take stream flow measurements and river depth readings on the Red River in Fargo, N.D. Even with reams of data, forecasting a flood is still an imprecise science. (AP Photo/Dave Kolpack)
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