water alert will likely remain in place well into next week. >> ames is now a town virtually cut off by flood waters. >> reporter: several consecutive days of heavy downpours brought ames the worst flooding here ever. hundreds of homes evacuated, businesses shut down, roads closed by rising water. in some cases, with deadly consequences. police released the 911 calls from a group of local teens trapped in several cars. swept off a rural road into a flood-swollen creek. >> we're going under water right now. and there's nowhere to go. >> get out. >> 16-year-old jessica webb did not survive. >> you got your water? >> reporter: volunteers handed out free bottled water to every ames resident who needs it. a gallon a day each. the traffic steady at makeshift pickup sites. the flood drained the proud-looking water towers. the saturated ground so heavy, the grounds cracked under the