In this April 30, 2013 photo, United States Geological Survey hydrologist Dan Thomas uses a laptop computer to compile results from a sonar device that measures stream flow speed and de

 

              In this April 30, 2013 photo, United States Geological Survey hydrologist Dan Thomas uses a laptop computer to compile results from a sonar device that measures stream flow speed and de
In this April 30, 2013 photo, United States Geological Survey hydrologist Dan Thomas uses a laptop computer to compile results from a sonar device that measures stream flow speed and depth of the Red River in Fargo, N.D. Even with reams of data, forecasting a flood is still an imprecise science. (AP Photo/Dave Kolpack)