We get this call constantly, usually in the same week across half of Stamford and Cos Cob: the back corner of the yard is a swamp, there is water in the basement again, and nothing anyone has tried has helped. Almost every time, the amount of rain is not the variable. Where the water goes is.
Start with the roof, because it is the biggest single source and the easiest to fix. An average Fairfield County roof sheds a genuinely large volume of water in a heavy storm, and every downspout that dumps at the foundation is delivering it directly to the one place you do not want it. Downspouts that discharge within a few feet of the house are the most common cause of a wet basement we see, and extending or burying them to a proper discharge point often solves the problem on its own.
Next, look at grade. Soil settles against a foundation over the years, and a lot of older houses around here now slope gently toward the building rather than away from it. You want the ground falling away from the house over the first several feet. That is regrading work, it is not glamorous, and it fixes more basements than waterproofing does.
Third is the low spot that never drains. If water sits in one area for days, it usually has nowhere to go — either it is a genuine depression, or the soil is heavy clay, which a lot of Fairfield County is. A French drain, a perforated pipe bedded in stone and wrapped in filter fabric, collects that water and carries it somewhere useful. The critical detail is the somewhere: a drain that runs to another low point in your own yard has moved the puddle, not removed it.
Fourth, hard surfaces. Patios, walkways and driveways that were poured or set flat, or pitched toward the house, concentrate water instead of shedding it. When we pour flatwork we set the pitch first, because a slab that drains correctly is the same price as one that does not, and only one of them is a problem later.
Fifth, the underground system nobody has looked at in twenty years. Older properties often have existing drains, dry wells or catch basins that have silted up completely. Finding and clearing an existing system is regularly cheaper than installing a new one, so it is worth checking before anyone quotes you a full install.
One thing worth saying plainly: drainage work should start with a walk in the rain, not with a price. Anyone who quotes a French drain before looking at your roof runoff and your grade is guessing, and a drain in the wrong place is an expensive way to keep the same puddle.
Call Edmundo Landscaping at (203) 963-0787 for a free drainage assessment across Stamford, Greenwich, Norwalk, Darien and the rest of Fairfield County.