Erosion is a natural process caused by the action of wind, rainfall and stormwater runoff on soil. The force of raindrops and surface runoff can detach soil particles, where they are transported as sediment. Sediment in stormwater runoff can pollute water and degrade aquatic habitat.
The Environmental Protection Agency lists sediment as the largest pollutant of rivers, streams and lakes, causing $16 billion in damage annually.
Problems caused by sediment
Sediment fills up stormdrains that carry water away from roads and homes, which increases the potential for flooding.
Sediment in streams changes flow patterns and covers habitat with mud. Water polluted with sediment becomes cloudy, preventing fish from seeing food and filtering light away from plants growing in the water.
In urban and surburban areas, soil often includes chemicals not usually present in the water, such as heavy metals and excess nutrients that cause algae blooms. 
Erosion and sediment control in Lenexa
Construction activity is a primary source of sediment in urbanized areas. Municipalities in urban areas are required by the Clean Water Act to manage the stormwater runoff from construction sites.
In 2001, the City of Lenexa adopted its Land Disturbance ordinance which is intended to:
- control stormwater runoff from construction sites
- reduce water pollution and improve water quality
- protect valuable waterbodies and natural resources
Under these provisions, any person disturbing more than 100 cubic yards or 5,000 square feet of soil must obtain a permit from the city. Certain activities, including gardening and agriculture, are exempt from this requirement.
Questions?
Contact Dale Clark, erosion and sediment control inspector. Additional information is also available in the Erosion and Sediment Control Program Manual.