听力原文:Following last Monday's heavy storm in the Wilmington Valley, flood waters from the Wilmington River have risen over twenty feet. Thousands of families have been evacuated from the region and are living with relatives and in shelters throughout the state. Fortunately, no loss of life has been reported, but property damage is estimated to be in the millions. The downtown districts of both Riverside and Wilmington Falls are completely flooded, and the areas have been closed to all visitors. It is doubtful whether the evacuees will be able to return to their homes any time soon. The president will tour the area on Friday. He will speak to the nation about the situation during his regular Saturday address. What is the problem?