If your lawn squelches underfoot from November to March, you're in good company. Soggy winter lawns are one of the most common yard complaints in the Fraser Valley, and the reasons are mostly about where we live rather than anything you did wrong.
Why valley lawns hold water
The soil. Much of the valley floor is old river floodplain. The soil is rich, but it's heavy with silt and clay. Those fine particles pack tightly and let water through slowly, so rain sits near the surface instead of soaking away.
The water table. In low-lying areas such as parts of Chilliwack, Greendale, Fairfield Island and the Abbotsford prairies, groundwater can rise close to the surface in winter. When the ground underneath is already full, rain has nowhere to go.
The rain itself. Most of our rain falls between fall and spring, often for days at a time. Even well-drained soil struggles to keep up.
How the lot was built. Many newer subdivisions have a thin layer of topsoil over compacted fill. The fill acts like a lid, holding water in the top few inches where the grass roots live.
How to tell what's going on
Walk the yard after a few days of steady rain and note:
- Where the water sits. One low spot, a whole side yard, or the entire lawn?
- How long it lasts. A puddle that's gone by the next afternoon is minor. Ground that stays spongy for weeks points to drainage or soil problems.
- Where it comes from. Downspouts, a neighbour's yard, a slope above you, or rising from below?
- What's near the house. Water pooling against the foundation is the one to deal with first.
Take photos. They're the single most useful thing you can send a landscaper.
What actually fixes it
Most soggy lawns need one or more of these, roughly from cheapest to most involved:
- Downspout extensions. If wet spots are near the house, roof water is often the cause. Buried pipe can carry it well away.
- Aeration and topdressing. For compacted lawns on decent soil, opening the ground up and adding a sandy topdressing improves drainage over a season or two.
- Regrading. Reshaping the soil so the lawn falls gently away from the house and toward somewhere water can go.
- A swale. A shallow, grassed channel that steers surface water across the yard.
- A French drain. A gravel trench with perforated pipe that collects groundwater and carries it away. See our guide to French drain costs.
- Starting over. If the lawn sits on thin topsoil over fill, the lasting fix may be stripping it, improving the soil and re-sodding.
The question every fix has to answer
Where does the water go? It can't go onto a neighbour's property, and connecting to a city storm drain or ditch often needs approval. Options include rock pits (dry wells), rain gardens or an approved storm connection. Any good quote will say exactly where the water ends up.
When to do the work
Winter is the best time to see the problem. Late spring to early fall is the best time to dig, once the ground has firmed up. Book an assessment while it's wet, then schedule the work for drier months.
If you'd like local quotes, describe the problem and add a few photos. We'll send it to drainage landscapers near you.