Rain Garden Keeps Roof Runoff Out of Shoreline's Sewer System

Most downspouts just dump roof runoff onto the ground and send it straight toward the city sewer system. It works, technically - but it's a missed opportunity. A well-designed rain garden turns that runoff into a resource instead of a problem.

Here's how this one works. The downspout feeds directly into a rock-lined catch point at the center of the garden. From there, water spreads out across a shallow, mulched basin planted with native grasses, ferns, shrubs, and groundcover. The plants are chosen specifically because they can handle both wet feet during a heavy rain and drier conditions between storms. That's the key to a rain garden that actually performs - the right plants in the right spots.

We also installed overflow drains within the basin. That's an important detail. If a storm dumps more water than the garden can absorb, those drains give it somewhere to go so you don't end up with standing water becoming a nuisance. It's a complete system, not just a pretty planting bed.

What makes this type of installation especially worth considering right now is the rebate programs available through the City of Shoreline and Seattle. These programs are designed to offset installation costs for property owners who reduce stormwater runoff - and a rain garden is one of the most effective qualifying improvements you can make. It's one of those rare situations where doing the right thing for the environment also makes good financial sense.

Rain gardens are a great fit for multi-family buildings, single-family homes, and commercial properties alike. If you've got a downspout that's sending water somewhere you don't want it, this kind of drainage solution is worth a serious look.