Low Impact Development (LID) has been all the rage in stormwater design lately. Implementing rain gardens, pervious pavement, and bio-retention swales into site stormwater design is almost a must in many jurisdictions, at least in Washington State, the epicenter of all things stormwater. Low impact means low impact to the natural order of things, the natural drainage patterns. It means trying to mimic the drainage patterns of an undeveloped site as much as possible when designing a stormwater system to serve the developed site. How does this translate to stormwater maintenance once the site is complete?
First, the Technical Speak
The Washington State Department of Ecology proposes to add a “Source Control Program for Existing Development” to the Western Washington Phase II Municipal Stormwater Permit (Permit) as soon as August of 2018. For those of you with insomnia, you can take a look at the technical document here: The Technical Document. If you'd rather just learn what this means to you, read on.
Jeff McInnis is an engineer who knew there had to be a better way to help owners keep their systems in compliance.