Development is not allowed to cause additional flooding to other properties. Any time impervious cover is increased, there is the potential for increased stormwater runoff. Impervious cover includes roofs, parking lots, streets, driveways and other areas where the landscape cannot absorb rainfall. To combat this problem, the City of Austin requires all new developments to ensure that they will not adversely impact downstream properties. Developers are required to either provide on-site flow controls or pay fees for regional flood control projects.