Stormwater describes water that originates during rain or snow events. It can also be used to apply to water that originates from a snow melt or water runoff from over watering of lawns or gardens that enters the stormwater system. Stormwater that does not soak into the ground becomes surface runoff that either flows into waterways or is channeled into storm sewers. Stormwater causes concern for these reasons: flood control, water supplies and water pollution.
- Stormwater Ordinance
- APPENDIX A - Method of Pollutant Load Calculation for Compliance with Water Quality Standards
- APPENDIX B - Example System of Stormwater Management Credits and Incentives
- APPENDIX C - Notification of Start of Land Disturbing Activity
- APPENDIX D - Stormwater Permit Application: Less Than One Acre
- APPENDIX E - Stormwater Permit Application: One Acre and Greater Than
Below are four different descriptions of the term “Stormwater”. Each of the descriptions begins with natural precipitation, then branches out into different issues and challenges, it’s when water contacts the ground that makes the difference.
Managing Surface Flows
- Water from rain or melting snow. Many communities are concerned about the management of stormwater in developed areas because the amount of impervious surface has increased, thus reducing the area where rain water may naturally infiltrate the soil.
- Rain, which runs off roads, yards and roofs and down gutters into stormwater grates. Stormwater picks up silt and other contaminants as it runs over these surfaces. It is piped/runs untreated into creeks and streams.
- Water that is generated by rainfall and is often routed into drain systems in urban areas to alleviate flooding and erosion.
- That portion of precipitation that does not naturally percolate into the ground or evaporate, but flows via overland flow, interflow, channels or pipes into a defined surface water channel or a constructed infiltration facility.