Stormwater is rainwater or melted snow that runs off streets, buildings, lawns, and other sites. As part of the City’s floodplain management program, these surface flows are managed through the regulation of activities that generate stormwater runoff including projects that alter the natural flow of water or increase the amount of stormwater runoff.
Impervious surfaces such as concreate, asphalt, and roofs increase runoff by preventing precipitation from naturally soaking into the ground. Instead surface water runs quickly into storm drains, sewer systems, and drainage ditches and can cause:
Stream bank erosion
Increased turbidity (muddiness created by stirred up sediment) from erosion
Combined storm and sanitary sewer system overflows
Contaminated streams, rivers, lakes, and coastal waters