French Drains & Drainage Systems in Lake Stevens, WA

Drainage & French drains in Lake Stevens: what to know

The low impact development checklist sets a flow-control review once a site passes 10,000 square feet of effective impervious area, and it draws a separate line for polluting hard surfaces at 5,000 square feet. The city’s permeable surface sheet treats permeable pavers as half impervious, which changes the total we run for the lot.

A French drain performs when its outlet is fixed first and the trench falls steadily toward it. A curtain drain across a slope catches seepage before it reaches the grass, while tightlines carry roof water in solid pipe to a separate outlet so the perforated run stays clean. Whether the trench reaches the public right-of-way decides if the city’s right-of-way handout applies, and any grading above the earthwork band is measured against section 14.50.120.

Permits and rules in Lake Stevens

We check the trench route against the public right-of-way line, confirm whether a storm connection is involved, and total the earthwork before quoting. Whether the route stays on your lot or reaches the street is the first question we put to the city. Estimates list any right-of-way work on its own line, so no part of it hides inside the drain price.

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

How we approach it

Choose the outlet before the trench is laid out
Place the interception line above the saturated zone
Keep roof tightlines in solid pipe, apart from the perforated run
Settle any right-of-way or storm tie-in question before digging

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

Questions from Lake Stevens homeowners

Where can a Lake Stevens French drain discharge?

It goes onto ground that can take the flow, and any connection to the public system is a question we raise with the city first. We plan the outlet on ground we can see and measure, and discharge onto a neighbor’s lot stays out of the design.

Does a Lake Stevens French drain project need city review?

It depends on the trench, the earthwork volume, and whether the work reaches the public right-of-way. The city’s earthwork band begins at 50 cubic yards, and its right-of-way handout requires a permit for construction there, so we confirm each part for your lot.

Will a drain fix a wet Lake Stevens yard?

It can help where groundwater or perched water sits close to the grass. We measure the groundwater depth and the flow path first, so the recommendation rests on what we measure rather than on a general rule.