French Drains
Kamloops, BC
Solve yard drainage problems and protect your foundation with professionally installed French drain systems. Free site assessments available.
Standing Water Is Not Just Annoying — It Is Damaging Your Property
Every spring, we get calls from homeowners who have been watching the same soggy corner of their yard for years. The lawn never quite recovers. The soil stays soft and muddy long after the snow melts. Water pools against the foundation after every rain. And every year, the problem gets a little worse.
This is not just a cosmetic issue. Water that consistently pools against your foundation creates hydrostatic pressure that cracks walls and floods basements. Saturated soil erodes, undermines landscaping, and can shift the ground beneath patios and walkways. Wet lawns develop moss, fungal disease, and root rot. And in this region, where spring snowmelt can be intense and clay-heavy soils drain slowly, the problem is more common than most homeowners realize.
A French drain is one of the most effective and durable solutions available. It intercepts water before it can pool, redirects it away from problem areas, and does it all underground — invisible, maintenance-free, and lasting 30–40 years when properly installed. We have installed French drains throughout Kamloops, from hillside properties in Aberdeen and Juniper Ridge to flat lots in Brocklehurst and the North Shore where water has nowhere to go.
We start with a free site assessment — walking your property, identifying where water enters and where it needs to go, and designing a system that actually solves the problem. No guessing, no overselling. Just an honest assessment and a clear plan.
Foundation Protection
Intercept surface water before it reaches your foundation and creates hydrostatic pressure
Yard Drainage
Eliminate standing water and soggy areas that kill grass and create mosquito breeding grounds
Driveway Drainage
Channel water away from driveways and parking areas to prevent erosion and ice formation
Slope Drainage
Manage runoff on sloped properties to prevent erosion and protect downhill structures
Year Lifespan
Site Assessment
Years Experience
Drains Installed Annually
How a French Drain Actually Works
The concept is simple, but the design details matter. A French drain is a gravel-filled trench with a perforated pipe at the bottom. Water enters the trench through the gravel — which acts as a filter — and flows into the perforated pipe. The pipe carries the water by gravity to a discharge point: a storm drain, a dry well, a daylight outlet at the edge of the property, or a swale.
The key to a French drain that lasts 30+ years is the filter fabric. Without it, fine soil particles migrate into the gravel over time, clogging the system and reducing its effectiveness. We wrap the gravel and pipe in a high-quality geotextile filter fabric that allows water to pass freely while blocking soil particles. This is the detail that separates a drain that works for decades from one that fails in 5 years.
The slope of the pipe is equally critical. A French drain must maintain a minimum 1% grade (1 inch of drop per 8 feet of run) to ensure water flows by gravity to the discharge point. We use a laser level during installation to verify the slope throughout the entire system — not just at the ends.
What Goes Into a Properly Built French Drain
Trench Excavation
Dug to the required depth and width based on the volume of water to be managed. Typically 12–24 inches deep and 12 inches wide for residential applications.
Filter Fabric Lining
High-quality geotextile fabric lines the trench walls and bottom, preventing soil migration into the gravel while allowing water to pass freely.
Gravel Bed
Clean, washed crushed stone (not pea gravel) is placed in the trench to a depth that supports the pipe and provides drainage capacity.
Perforated Pipe
Rigid perforated PVC pipe is placed on the gravel bed with perforations facing down, allowing water to enter from below while debris stays out.
Gravel Backfill
Additional gravel is placed over the pipe to within 6 inches of the surface, then the filter fabric is folded over the top to seal the system.
Surface Restoration
Topsoil and sod are replaced over the gravel, leaving the drain invisible. The discharge point is finished with a proper outlet to prevent backflow.
French drain installation — gravel, filter fabric, and perforated pipe before backfill and surface restoration
Signs Your Property Needs a French Drain
Not every wet yard needs a French drain. Sometimes the fix is as simple as regrading the soil or extending a downspout. But when water is consistently pooling in the same spots, or when it is threatening your foundation or basement, a French drain is usually the right long-term solution.
Here are the specific situations where we typically recommend a French drain:
Standing Water After Rain or Snowmelt
If water pools in the same spots every time it rains or the snow melts, the soil is not draining fast enough. This is the most common reason homeowners call us. The water has nowhere to go — a French drain gives it a path.
Consistently Soggy or Wet Lawn Areas
A lawn that stays wet for days after rain, develops moss, or has areas where grass will not grow is telling you the soil is waterlogged. Clay-heavy soils — common in many Kamloops neighbourhoods — drain slowly and hold water near the surface.
Water Pooling Against the Foundation
Water that consistently sits against your foundation wall is creating hydrostatic pressure. Over time, this pressure cracks foundation walls, forces water into the basement, and can cause structural movement. A French drain intercepts this water before it reaches the foundation.
Basement Moisture After Rain
If your basement gets damp or wet during or after heavy rain — even without visible cracks — surface water is likely finding its way in through the foundation. A French drain around the perimeter of the home can significantly reduce this infiltration.
Erosion on Sloped Areas
Slopes that erode during rain events are losing soil because water is running off faster than the ground can absorb it. A French drain installed across the slope intercepts the runoff and redirects it before it can carry soil away.
Driveway or Patio Drainage Problems
Water that pools on driveways or patios, or that runs toward the garage or house, can be redirected with a French drain or channel drain installed at the low point. This is particularly important in winter when pooled water freezes and creates ice hazards.
If you are seeing any of these signs, a free site assessment is the right first step. We walk the property, identify the water source and flow path, and recommend the most cost-effective solution — which may be a French drain, a catch basin, regrading, or a combination. We will not recommend a French drain if a simpler fix will solve the problem.
Types of French Drain Systems — Which One Fits Your Property?
Not all French drains are the same. The right design depends on where the water is coming from, how much volume needs to be managed, and where it can be discharged. Here are the most common configurations we install:
Installed across a slope to intercept groundwater flowing downhill before it reaches the foundation or a low-lying area. The most common type for hillside properties. Typically runs perpendicular to the slope at the uphill side of the problem area.
Best for: Hillside properties, water flowing from uphill neighborsInstalled around the foundation of the home to collect and redirect groundwater before it creates hydrostatic pressure against the foundation walls. Often combined with a sump pump for complete basement protection.
Best for: Foundation protection, wet basement preventionInstalled in the middle of a yard to collect water from a low-lying area that has no natural outlet. Water enters the drain from all sides and is piped to a discharge point at the property edge.
Best for: Low spots in yards, areas with no natural drainage outletA linear drain installed across a driveway or patio at the low point to collect surface water before it reaches the garage or house. Typically uses a slotted grate rather than gravel for surface access.
Best for: Driveways, patios, garage apronsMany properties need a combination of drain types — for example, a curtain drain uphill combined with a perimeter drain around the foundation. During our site assessment, we map the water flow across your entire property and design a system that addresses all the problem areas in a single installation.
Completed French drain — gravel surface, perforated pipe underneath, drainage problem solved
Spring Snowmelt — Why Drainage Problems Are Worse Here
Spring snowmelt is the most challenging drainage event of the year in this region. When temperatures rise in March and April, snow that has accumulated all winter melts rapidly — often faster than the ground can absorb it. The result is significant surface water that overwhelms natural drainage, particularly in areas with clay-heavy soils that drain slowly.
In lower-lying neighbourhoods like Brocklehurst and the North Shore, where the terrain is relatively flat and clay soils are common, spring melt water has nowhere to go quickly. It pools in yards, saturates soil against foundations, and can overwhelm perimeter drains that have not been maintained. Properties near the Thompson River face additional groundwater pressure as the water table rises during melt season.
A properly designed French drain system handles spring melt by providing a fast, reliable path for water to exit the property. The key is sizing the system for peak flow — not just average conditions. We calculate the drainage area, estimate peak runoff rates, and size the pipe and gravel accordingly. A drain that handles a typical rain event but gets overwhelmed during spring melt is not solving the problem.
Why Clay Soils Make Drainage Harder
Clay soils are common throughout many Kamloops neighbourhoods. Unlike sandy or loamy soils that drain quickly, clay holds water and drains slowly — sometimes taking days to absorb what fell in a single rain event. This creates the conditions for chronic drainage problems that only a properly engineered French drain can reliably solve.
What a French Drain Costs — And What Affects the Price
French drain costs vary significantly based on the length of the system, the depth required, soil conditions, and the discharge location. We are transparent about pricing because we want you to make an informed decision. Here is what affects the cost:
| Factor | Impact on Cost |
|---|---|
| Drain Length | Primary cost driver — longer drains cost more. Short spot drains: $1,500–$3,000. Full perimeter systems: $4,000–$10,000+ |
| Depth Required | Deeper drains require more excavation and gravel. Shallow surface drains are less expensive than deep foundation drains. |
| Soil Conditions | Rocky soil increases excavation time and cost. Clay soils require larger gravel beds for adequate drainage capacity. |
| Discharge Location | Discharging to a storm drain or existing drainage system is simpler. Installing a dry well or long discharge pipe adds cost. |
| Surface Restoration | Restoring sod, landscaping, or hardscaping after installation adds to the total cost. |
| Access Constraints | Limited access for equipment (fences, gates, narrow passages) increases labour time and cost. |
The best way to get an accurate cost is a free site assessment. We walk the property, measure the drainage area, assess soil conditions, and identify the discharge options. You get a detailed written quote with no obligation. Most assessments take 30–45 minutes and can be scheduled within a few days.
Tired of the Same Wet Spots Every Spring?
A free site assessment takes 30 minutes and gives you a clear picture of what is causing the problem and what it will take to fix it permanently.
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French Drain Questions — Answered Honestly
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