Portland's stormwater management rules require properties to handle first-flush rainfall onsite. Our rain gardens transform this necessity into landscape features using native plants that filter runoff naturally.
We design bowl-shaped depressions lined with gravel and amended soil to absorb water from downspouts or paved areas. The gardens are sized based on your roof's square footage and positioned at least 10 feet from foundations to prevent moisture issues. Plant selections vary by neighborhood - inner SE properties get more sun-tolerant species than shaded NW gardens.
For commercial properties in the Pearl District facing stricter requirements, we create tiered systems with overflow channels that handle large storm events while keeping runoff out of the combined sewer system.
We design bowl-shaped depressions lined with gravel and amended soil to absorb water from downspouts or paved areas. The gardens are sized based on your roof's square footage and positioned at least 10 feet from foundations to prevent moisture issues. Plant selections vary by neighborhood - inner SE properties get more sun-tolerant species than shaded NW gardens.
For commercial properties in the Pearl District facing stricter requirements, we create tiered systems with overflow channels that handle large storm events while keeping runoff out of the combined sewer system.
Our Process
- 01 Step 1: Roof measurement and percolation testing
- 02 Step 2: Design approval with Portland's Clean River Rewards program
- 03 Step 3: Excavation and soil amendment with compost
- 04 Step 4: Planting with species selected for pollution filtration
Benefits
- Reduces stormwater fees up to 35%
- Provides habitat for beneficial insects
- Filters oil and heavy metals from runoff
- Prevents basement flooding
Frequently Asked Questions
Will these create mosquito problems?
Properly designed rain gardens drain within 24 hours - faster than mosquito breeding cycles require. We include mosquito-deterring plants like lemon thyme as extra protection.
How much maintenance is required?
Just annual mulching and weeding for the first 3 years until plants establish. We provide detailed care sheets specific to Portland's seasons.