Drainage Solution
Dry Well & Catch Basin Installation in Islip, NY
Planning a dry well installation or catch basin project in Islip? Surface inlets collect water from downspouts and low spots, while underground dry wells store runoff and slowly release it into surrounding soil. Request a free property-specific estimate.
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Islip and nearby Suffolk County. Tell us where the water collects so we can arrange the next step.
The Problem
Why water collects
Roof runoff and surface water have nowhere to collect, so they pool against your foundation and erode your landscaping with every storm. Downspouts that dump water next to the house are a leading cause of basement seepage on Islip properties.
The Solution
How it's resolved
Catch basins act as surface inlets, capturing runoff before it spreads. A dry well receives that water underground and lets it percolate naturally into the soil. Proper sizing depends on runoff volume, soil conditions, and the property's available discharge or storage options.
How dry wells and catch basins work together
Dry wells and catch basins are complementary components that form a complete runoff management system. Catch basins capture water at the surface; dry wells receive and store it underground. Together they move water away from your home and release it safely into the earth.
Catch basins: the surface inlets
A catch basin is a grated inlet set into the ground at a low point in the yard or beneath a downspout. Water flows into the basin, sediment and debris settle in the sump below, and cleaner water exits through a connected pipe. The grate keeps leaves and large debris out of the system.
Catch basin installation is one of the most effective ways to capture surface runoff before it spreads across the lawn or reaches the foundation.
Dry wells: underground storage
A dry well is a buried chamber — typically a perforated tank or crate system surrounded by stone — that receives water from catch basins, downspouts, or French drains. The stored water slowly percolates through the perforations and into the surrounding soil, dispersing it well below grade and away from the foundation.
Because the dry well is underground, it's invisible once installed and doesn't take up yard space. It acts as a buffer, absorbing surges of stormwater and releasing them gradually so the soil isn't overwhelmed.
Dry well installation: when it's appropriate
Dry well installation is a good fit when you need to manage roof runoff or surface water but don't have a gravity outlet — a slope or lower area where water can discharge to daylight. Instead of sending water off the property, a dry well stores it underground and lets it percolate into the soil.
Dry wells work best when the surrounding soil can absorb water at a reasonable rate. In slow-draining soil, a contractor may recommend more storage capacity, multiple units, or additional drainage. A site evaluation or percolation testing can help determine whether a dry well is viable and how it should be sized.
Dry wells are frequently combined with downspout drainage and extensions to manage roof runoff, and with French drains to handle subsurface groundwater — creating a system that addresses water at every level.
Catch basin installation for surface water
Catch basins are commonly used for surface water that pools in low spots or sheets across the yard. Placing basins at appropriate low points and connecting them to subsurface piping or a dry well can give surface water a controlled path off the lawn.
Catch basins are also installed beneath downspouts to capture roof runoff at the source, preventing the erosion and pooling that occur when downspouts discharge directly onto the ground. Regular cleaning of the sump keeps the system flowing freely.
Common property conditions in Islip
Downspouts that discharge immediately beside a foundation concentrate roof runoff into a small area. If the surrounding grade, soil infiltration, or drainage path cannot move that water away efficiently, the ground can remain saturated near the house and contribute to recurring pooling or seepage.
Catch basins and dry wells address this directly by capturing runoff and storing or dispersing it underground, away from the house. They're especially useful on properties where re-grading alone can't solve the problem and where no daylight outlet is available for a pipe discharge.
How Town of Islip plot-plan review approaches drainage capacity
When a project is subject to Town of Islip plot-plan review, the Engineering Division's checklist requires calculations showing capture of a 2-inch rainfall across impervious surfaces such as driveways, walkways, and patios. The same checklist requires the plan to show the proposed drainage method and calculations rather than relying on a generic one-size-fits-all dry-well size. See the Town of Islip Plot Plan Minimum Requirements Checklist.
That does not mean every residential drainage project automatically needs a plot plan. It does show why runoff area, storage capacity, groundwater separation, structure location, and the proposed conveyance method matter when a system is reviewed or designed.
Already have a dry well that is backing up?
If an existing dry well or connected catch basin used to clear water and now stays full, overflows, or drains much more slowly, start with our dry well troubleshooting guide. The problem may be in the inlet, buried piping, storage capacity, sediment buildup, or surrounding infiltration — not necessarily the chamber alone.
Cost factors for dry wells and catch basins
The cost of a dry well or catch basin system depends on the components, storage capacity, piping, excavation, and site conditions. An on-site evaluation is usually needed before a contractor can provide meaningful pricing.
What influences the price
Key factors include the size and number of dry wells, contributing roof or yard area, measured or observed soil infiltration, the number of catch basins needed, the length of connecting pipe, excavation depth, access conditions, and whether the system ties into existing drainage like a French drain or downspout line.
A single catch basin and smaller dry well generally costs less than a multi-basin system with larger storage capacity. The system should be sized to actual runoff volume and site conditions rather than using a one-size-fits-all design.
Key benefits
FAQ
Frequently asked questions
How long do dry wells last?
A properly sized and installed dry well can last for decades. Periodic cleaning of connected catch basins and keeping sediment out of the system helps maintain long-term performance.
Do dry wells work in clay soil?
They can, but slow-draining soil may require more storage capacity, multiple units, or another drainage strategy. Site conditions should be evaluated before choosing the approach.
How big should my dry well be?
Dry well size depends on contributing roof or yard area, expected runoff, soil infiltration, and available space. A contractor should calculate the needed storage capacity for the specific property.
Do I need a catch basin if I already have a dry well?
Often yes. A catch basin captures surface water and traps sediment before it reaches the dry well, protecting it from clogging. The two components are usually installed together as a complete system.
Ready to solve your drainage problem?
Request your free estimate today and get a property-specific drainage assessment for the right solution.