Dry Well Installation on the Connecticut Shoreline
Not every property has a convenient downhill slope where a French drain or downspout extension can discharge to daylight. When there’s nowhere for collected water to go, a dry well is the solution. A dry well is an underground chamber that collects stormwater and allows it to slowly percolate into the surrounding soil. Drainage Pro of CT installs dry wells across the CT shoreline, typically for $1,500 to $3,500.
How a Dry Well Works
A dry well is essentially a holding tank buried underground. Collected water from downspouts, French drains, or surface drainage enters the well through inlet pipes. The well holds the water temporarily, then releases it slowly into the surrounding soil through perforations or open-bottom design. The soil acts as a natural filter and absorption medium.
Modern dry wells use prefabricated plastic or concrete chambers that provide significant holding capacity in a compact footprint. The chamber is wrapped in filter fabric to prevent soil migration, surrounded by drainage stone to increase the absorption area, and buried several feet below grade.
Dry wells are commonly paired with downspout drainage to manage roof water on properties without a natural downhill discharge point.
When You Need a Dry Well
- Your property is flat with no downhill discharge point for drain pipes to daylight.
- Local ordinances require on-site stormwater management.
- You need to collect and manage roof runoff from downspouts on a property where running underground pipes to the street or a slope isn’t practical.
- A French drain or curtain drain system needs a terminus and there’s no natural outlet nearby.
Sizing Matters
An undersized dry well overflows during exactly the storms you need it most. We calculate the required capacity based on your roof square footage, the drainage area feeding the well, and local rainfall intensity data. A 1,200-square-foot roof in Connecticut generates roughly 750 gallons of water per inch of rain. During a moderate storm of two inches, that’s 1,500 gallons your dry well needs to handle. We design for real storm events, not averages.
Dry Well Cost
Dry well installation on the CT shoreline typically costs $1,500 to $3,500 depending on the size of the chamber, depth of installation, number of inlets, and soil conditions. Properties with sandy soil (common near the coast) drain more quickly and may need smaller wells. Properties with clay soil (more common inland) drain more slowly and need larger capacity. We assess your soil during the free on-site estimate. Every dry well installation is backed by our 5-year workmanship warranty.
Frequently Asked Questions About Dry Wells
How does a dry well work?
A dry well is an underground chamber --- either a perforated tank or a pit filled with gravel --- that collects stormwater and allows it to slowly percolate into the surrounding soil. Water from downspouts, French drains, or surface drains flows into the dry well, which acts as a temporary holding tank while the soil absorbs the water over hours or days.
How big does a dry well need to be?
Dry well sizing depends on the volume of water it needs to handle and the percolation rate of your soil. Sandy soil absorbs water faster and can use a smaller well. Clay soil absorbs slowly and needs a larger chamber. We calculate the required size based on your roof area, local rainfall data, and actual soil conditions on your property.
Can a dry well handle heavy Connecticut rainstorms?
A properly sized dry well handles the volume from most storms. During extreme events, overflow provisions route excess water safely away. We design systems for Connecticut rainfall intensity, not national averages, because our nor’easters and summer thunderstorms deliver water faster than what most generic sizing guides account for.
