The Stormwater Code/Design Manual Project will establish requirements to protect and improve Lake Oswego's water resources (including Oswego lake, Springbrook Creek, the Willamette River, Tryon Creek, and the Tualatin River), meet regulatory requirements, and ensure transparency and consistency in how stormwater requirements are applied and enforced.
The project will:
Outcomes: The process will result in three products, described briefly below.
Point and Non-point Pollution Sources
The goal of stormwater management is to improve the quality of the stormwater runoff before it enters a water body. To properly manage stormwater pollution it is important to understand the two different sources of stormwater pollution: point sources and nonpoint sources (NPS).
A point source is a single identifiable localized source of pollution, such as a municipal sewage treatment center, which are tightly managed by national standards including the National Pollution Discharge Elimination System permit program of the Clean Water Act.
Non-point sources (NPS) of pollution are the Nation's largest source of water quality problems, according to the EPA. Non-point pollution occurs when rainfall, snowmelt, or irrigation runoff collects pollutants and carries them into area rivers, lakes, or ground water. Runoff can collect debris, chemicals, sediment or other pollutants that could adversely affect water quality if the runoff is discharged untreated. Nonpoint sources are also called “urban nonpoint sources” because urbanization increases the variety of pollutants and likelihood of stormwater collecting pollutants before re-entering water bodies. This is due to the increase in impervious surfaces, buildings, and pollution-causing activities that can be found in urban and suburban areas.
The following Common Non-Point Pollution Sources are being considered in the Lake Oswego Stormwater Code and Design Manual update:
Work is well underway to update the City’s stormwater code and design manual. The Project Team has been reviewing regional stormwater codes and manuals including those from the Clackamas County, City of Portland, Clean Water Services, City of Seattle, City of Gresham, City of Eugene and the City of Salem.
A big area of focus is promoting low impact development as a best management practice (BMP). To make sure that vegetated BMPs, such as rain gardens, reflect community aesthetics, treat stormwater effectively, and thrive, members of the Project Team have met with City maintenance staff. We are also talking to local nurseries about plant availability. This will provide an opportunity for nurseries to respond to the growing need for particular plants.
This update will result in a code that easier to understand and meets the intent of State/Federal law. The updates to the Design Manual will provide clear guidance on how stormwater management facilities (e.g., swales and rain gardens) should be selected, sited, designed, constructed and maintained.
The first Project Advisory Committee meeting was held on October 12 with the next being on November 30. All meeting materials and project information can be found on the project advisory committee page.
10/31/2011 - Stormwater Code and Design Manual Open House
The City of Lake Oswego held an outreach event held Saturday, October 22, at Hazelia Field to promote public understanding, education and enthusiasm of watershed issues and the current Lake Oswego stormwater code and design manual update project. The event ran from 10:00a.m. – 1:00p.m. and featured informational stations and activities for participants to engage in and learn about stormwater issues in Lake Oswego. These stations included information about:
This event attracted several members of the Lake Oswego community who came specifically to learn about the project. Because the convenient location, several other visitors stopped by while visiting Luscher Farm on the day of the event as well.
If you missed the event, the informational posters are available below.