French Drains & Drainage Systems in Kenmore, WA

Drainage & French drains in Kenmore: what to know

Seepage uphill of the problem area is intercepted by a curtain drain set along the slope, its trench cut on a steady fall. Behind it, a French drain collects what the curtain passes and carries that water to the outlet on the lot. We test the stone bed for flow before backfill and draw the complete route on the site plan.

Downspouts feed solid pipe to their own discharge, kept separate from the perforated line. Each outlet is picked from ground able to take the water, a storm line the city has accepted in writing, or a spot well clear of the foundation. A run that cuts across the right-of-way is subsurface work, which the checklist groups under Type A with surface removals and alterations.

Permits and rules in Kenmore

We check whether the line crosses into the right-of-way, and we confirm which stormwater review the parcel’s new and replaced impervious area falls under, both before any ground is opened. A storm-line hookup goes to the city in writing first. Every open review appears on the estimate with its status, so nothing is buried in the price.

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

How we approach it

Set the outlet on the lot before the first trench is cut
Give each downspout a solid line clear of the perforated run
Note any run that crosses the right-of-way as a Type A item
Total the parcel’s impervious change against the 500 square foot line

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

Questions from Kenmore homeowners

Where can a Kenmore French drain discharge its water?

Ground on the lot that can take the flow comes first, with a city storm connection as the fallback once it has been approved in writing. Water is never sent onto the street or a neighbor’s lot, so the outlet is fixed before any trench is cut.

Would a backyard drain in Kenmore trigger a review?

A line that stays on private ground is measured against the stormwater review and the building side. A run into the right-of-way falls under the Type A checklist. We confirm which track applies with the permit technician before digging.

Will a drain help a wet yard in Kenmore?

Often, yes, when runoff arrives from higher ground and has a way off the parcel. We walk the slope first and suggest a line only if the water has a workable exit.