Trench & Channel Drain Installation in Seattle & King County WA
Keep surface water under control with clean, effective trench drainage systems.
Sandbagger installs trench and channel drains for driveways, patios, walkways, and problem areas where water flows across the surface — and causes damage.
What is a Trench or Channel Drain?
Control Surface Water Before It Becomes a Problem
Trench and channel drains are long, narrow surface drainage systems designed to intercept and redirect runoff water before it floods driveways, walks, patios, or garages.They’re perfect for:
Water that flows across concrete or hardscapes
Garage flooding from driveway runoff
Erosion near sidewalks or garden edges
Pooling near entryways, steps, or slabs
Patios that collect standing water
What’s Included
What’s in a Sandbagger Trench Drain System?
We design and install surface drainage that blends performance with durability:
On-site slope and flow analysis
Precision trench cutting and leveling
Professional-grade pre-sloped channel drain systems
Grated covers (steel, aluminum, or plastic options)
Clean-out access if needed
Full surface restoration — concrete, pavers, gravel, or soil
All materials are built to handle PNW weather and heavy water volume.
Common Uses
Where Trench & Channel Drains Work Best
Driveway-to-garage transitions
Patios or outdoor entertaining areas
Along walkways and stairs
Around pool decks or retaining walls
Bottoms of slopes or grade changes
Why Homeowners Trust Sandbagger
Built with Precision. Installed to Last.
Woman-owned and Seattle-based
RainWise-certified and WA State Erosion Control Lead
Designed for surface flow AND subsurface tie-ins
Clean lines, clean installation, and no guesswork
Trusted by 200+ homeowners in King County
Where We Work
Serving Homes Across King County WA
We install surface drainage systems for homeowners in:
Seattle
Burien
RENTON
KENT
DES MOINES
SHORELINE
TUKWILA
Bellevue
Federal Way
& surrounding areas
REVIEWS
What Clients Say
Trevor G., Seattle WA
Our garage used to flood every time it rained. After the trench drain install, not a drop gets in. It works flawlessly.
Megan C., Renton WA
The crew cut a trench across our patio, tied it into a drywell, and cleaned up perfectly. Professional from start to finish.
FAQs
Trench & Channel Drain FAQs
Are these drains only for concrete?
No. We install trench drains across pavers, gravel, asphalt, concrete, and even soil pathways.
Do trench drains require maintenance?
They may need occasional debris clearing, especially near trees. Optional clean-outs can make it easier.
How long does installation take?
Most installs are completed in one day, depending on site conditions and surface type.
Keep Surface Water Away from What Matters
Let’s inspect your problem areas and install the right surface drainage system — professionally and permanently.