French Drains & Drainage Systems in Burien, WA

Drainage & French drains in Burien: what to know

Where drain water is released matters most on bluff and ravine lots. Inside critical areas, the construction standards can require erosion and stormwater control plans, and peak runoff from the property may not increase. The city’s shoreline page links Ecology guidance on surface water and groundwater on coastal bluffs. On those lots, a pipe that ends at a slope edge is the plan to avoid.

Elsewhere, the rules favor keeping water on your lot. Burien has adopted the 2021 King County Surface Water Design Manual, which makes low impact practices such as dispersion and infiltration standard in nearly every project, and sets Level 2 flow control citywide. Roof and driveway drains are the owner’s to maintain.

Permits and rules in Burien

Public Works administers the surface water chapter, and any development needing a city permit gets at least simplified drainage review. A tie-in to a street pipe can mean cutting pavement, and Burien bars cutting a street for five years after it is built or resurfaced, with limited waivers. The city posts a map of those streets. We look up your street on that map, and the outlet rules, before we quote.

Rules change and vary by parcel, so we confirm the current requirements with the city before we start.

How we approach it

Find an on-lot outlet before sketching any trench or pipe run
Check the five-year no-cut street map before planning a street tie-in
Keep outlets spread out on level ground, back from bluff and ravine edges
Test how the soil takes water at trench depth before counting on infiltration

For the full process, see our Drainage Systems & French Drains page.

Questions from Burien homeowners

Where can a French drain in Burien discharge?

Preferably spread out on your own lot, by dispersion or infiltration, which the King County manual the city adopted treats as standard practice. A street tie-in goes through Public Works. A bluff or ravine edge is the wrong place to release water. We settle the outlet first.

Can I cut into my Burien street to connect a drain?

Often not on a newer street. The right-of-way code bars cutting pavement for five years after it is built or resurfaced, with limited waivers, and the city posts a map of those streets. Any cut needs a right-of-way use permit and a restoration that Public Works approves.

Do I need a permit for a French drain on my Burien lot?

Some small drain jobs fall under the grading exemptions, but those end in critical areas, steep slopes, landslide hazard areas, flood hazard areas, and shoreline. Any project that needs a city permit gets drainage review. We check your parcel’s mapping before we dig.