French Drains & Foundation Drainage, Southern Oregon

A french drain is a trench filled with drain rock and a perforated pipe, wrapped in filter fabric to keep soil out. Water that collects in saturated ground or along a foundation enters the perforations in the pipe and flows by gravity to a daylight outlet, a point where it exits away from the structure. The filter fabric prevents the drain rock from silting up over time. French drains are one of the most reliable ways to move groundwater away from foundations, crawlspaces, yards, and soggy low spots.

Cost depends on the length of the drain run, how deep it needs to go, site access, soil conditions, where the outlet will be, and what surface restoration is needed after the trench is backfilled. A short yard drain and a full perimeter foundation drain are very different scopes of work. The best way to get an accurate number is a free on-site quote, call (541) 512-5280.

Standing water usually comes from low spots with nowhere to drain, clay soils that hold water instead of letting it percolate, or concentrated runoff from roofs, slopes, or hard surfaces. A french drain, curtain drain, or catch basin with a daylight outlet can intercept water before it pools and direct it away. The right solution depends on where the water is coming from and where it can go, exactly what we assess during a free site visit.

A properly designed perimeter drain or curtain drain can significantly reduce or eliminate groundwater intrusion into crawlspaces and basements by intercepting water before it reaches the foundation wall. The key is identifying whether water is coming from surface runoff, groundwater pressure, or a specific infiltration point, each has a different fix. Pacific Earthworks assesses the source and installs the drain system that addresses it.

Water that enters the french drain system flows by gravity through the perforated pipe to a daylight outlet, a point where the pipe exits at grade on a slope, into a ditch, or to a surface discharge point away from the structure. The outlet needs to be lower than the inlet and in a location where discharged water won't create a new problem. We design the drain system and outlet location together as part of the same job.

A french drain installed with proper filter fabric around the drain rock is designed to resist silting and clogging for many years. The main risk is fine soil migrating into the system if the fabric is damaged or omitted. Over time, occasional maintenance, flushing the pipe, inspecting the outlet, can extend the system's life. We install drains with the right materials and can advise on any maintenance appropriate for your system.