Comments sought on the draft Total Maximum Daily Load (TMDL) Implementation Plan for the City's Healthy Watersheds surface water management program.
The Total maximum daily loads (TMDLs) implementation plan, like the City's stormwater permit, inform our Healthy Watersheds surface water management program in Lake Oswego.
A TMDL specifies the maximum amount of a pollutant that a water body can receive and still meet water quality standards. It also allocates the pollutant loadings for point sources (pollutants that enter through pipe systems) and non point-sources (sources that enter surface waters through disperse means, such as runoff). For Lake Oswego, the Oregon Department of Environmental Quality (DEQ) has set TMDLs for water bodies in the Willamette River Basin and Tualatin River Basin. This includes all tributaries to Springbrook Creek and Oswego Lake, as well as streams that discharge to the Willamette and Tualatin Rivers.
Since Lake Oswego has authority over activities and areas that are sources of pollutants that impact water quality, the City must develop a TMDL Implementation Plan describing the strategies to be undertaken to address load allocations for nonpoint sources of TMDL pollutants.
Most of the TMDL implementation occurs through our stormwater permit, and the rest through the TMDL implementation plan, which requires formal review prior to submitting to DEQ. The draft document under review is a companion document to our 2012 Stormwater Management Plan.
Read more about the:
Healthy Watersheds Program here: http://www.ci.oswego.or.u/publicworkshealthy-watersheds-program
Stormwater program here: http://www.ci.oswego.or.us/publicworks/stormwater-program
Annual reports and stormwater management plan here: http://www.ci.oswego.or.us/publicworks/stormwater-permits-plans-and-reports