Trench Drain Installation

What This Service Involves

Trench drains handle the heavy, sustained flows our Western Washington winters produce, using a deeper and wider channel than a typical surface grate. We excavate a graded trench, bed it in gravel, and install a rugged pre-sloped drain body capped with a load-rated grate. The system captures runoff over a long run and channels it into a solid pipe that discharges to a safe outlet or storm connection. This is the right choice where large volumes of water cross a driveway entrance or collect at the base of a slope.

Benefits

Manages large, sustained runoff volumes; Spans long distances to catch water along its full path; Load-rated grates support vehicle traffic; Reduces erosion at slope bottoms and driveway aprons; Keeps entrances passable through wet PNW months

Our Process

1) Map drainage flow and mark the trench alignment; 2) Excavate to depth and establish a consistent slope; 3) Bed the trench in compacted gravel for support; 4) Set the pre-sloped drain body and connect the outlet pipe; 5) Backfill, install the grate, and test the flow

What Affects the Cost

Overall trench length and excavation depth; Grate load rating for foot versus vehicle traffic; Soil conditions and rock or clay encountered; Outlet distance and discharge method; Restoration of paving or landscaping over the run

Best Time of Year

Excavation is smoothest in summer and early fall when soils are firmer, but trench drains can be installed whenever access allows.