Sepulveda Basin is a flood-control basin to manage floodwater runoff. Several villages in and around Ongole were inundated by floodwater. Major arterial roads to and from Ponce were blocked by floodwater and landslide debris. Houses, trains, and people inundate in floodwater. The excess floodwater caused streams to overflow their banks. A special form of irrigation using surface water is spate irrigation, also called floodwater harvesting. Public and private roads were clogged by vehicles stuck in floodwater. Wetlands can store approximately 1-1.5 million gallons of floodwater per acre. In Akron, Lock 1 was dynamited to allow backed up floodwater to flow. Further floodwater disabled the electric generators and pumps and extinguished the boiler furnaces. Three tornadoes develop and absorb the floodwater, turning into shark-filled "sharknados". Its abundance depends upon availability of floodwater pools. Only the southbound lanes of I-55 were closed by floodwater. Seven cars, all headed northbound, stalled in the floodwater. It took one week to pump floodwater out of low-lying areas.