French drains & trench drains
Excavate controlled drainage runs with appropriate bedding and backfill preparation.
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Drainage & Water Control · Oʻahu
Control the water before it controls the property.
Heavy drainage excavation, runoff management, and erosion-control preparation for Oʻahu properties and construction sites.
Licensed GEC CT-38531Islandwide OʻahuClear, upfront estimates
The groundwork
Water problems begin with understanding how the site moves runoff.
One crew. A defined scope. A cleaner handoff.
We review grade, soil, discharge direction, and site constraints before excavating a drainage path. The goal is a practical system that protects access, structures, slopes, and finished improvements.
Drainage and water-control capabilities.
Built around the property.
The correct solution may use collection, conveyance, regrading, or a combination based on the property—not a one-size-fits-all trench.
Catch basins & solid pipe
Prepare collection points and conveyance routes that move runoff away from vulnerable areas.
→Swales & drainage grading
Shape the ground to direct surface flow and reduce uncontrolled ponding or washouts.
→Culverts & erosion-control prep
Create crossings, outlets, and stabilized transitions for roads, slopes, and high-flow areas.
→Island conditions
Designed around Oʻahu downpours.
Short, intense rain events can expose small grading mistakes quickly. Drainage excavation must account for flow direction, soil behavior, and safe discharge.
Runoff patterns
Existing high points, low points, roof discharge, and neighboring flow are reviewed together.
Soil infiltration
Clay-heavy or compacted ground may require a different approach than freely draining material.
Slope protection
Outlets and transitions are prepared to reduce concentrated erosion and undermining.
Future access
Cleanouts, structures, and trench routes are considered with long-term maintenance in mind.
How the work movesSTEP 1 STEP 2 STEP 3 STEP 4
A clear path from site review to finished grade.
Read the property
Inspect the topography, problem areas, access, soil, and likely sources of runoff.
Define the system
Confirm collection points, conveyance routes, excavation limits, and discharge strategy.
Excavate & install
Open trenches, prepare bedding, place structures or pipe as scoped, and control elevations.
Backfill & finish
Compact, restore working grades, and leave the drainage path ready to perform.
Common questions
Know what to expect before work begins.
Do I need grading, a French drain, or both?
That depends on where the water originates and where it can safely go. Many properties benefit from a coordinated combination of surface grading and subsurface collection.
Can drainage work stop water from reaching my foundation?
A properly planned system can redirect and manage runoff, but the correct scope depends on site elevations, soil, existing construction, and available discharge locations.
Will permits be required?
Requirements vary by location, drainage destination, right-of-way impacts, and project scope. Any required approvals should be confirmed before construction begins.
Serving projects across Oʻahu
WahiawāHonoluluKapoleiWindwardNorth ShoreLeeward
Request a site estimate
Solve the runoff problem at the source.
Show us where water collects, flows, or causes damage. We will assess the site and define the excavation and grading scope.