Drainage problems are much easier to evaluate when the water path is documented. By the time an estimate is scheduled, puddles may be gone and the lawn may look normal again. A few well-timed photos, a short video, and a simple timeline can make the initial assessment far more useful.
The six things to document
1. Photograph the whole problem area
Start wide enough to show the house, yard, driveway, patio, fence line or other features around the water. Then take closer photos of the deepest pooling or saturated area.
2. Capture where the water is coming from
Look for roof runoff, a downspout outlet, a driveway edge, a neighboring grade, a low point in the lawn, or water collecting along the foundation. Do not assume the puddle itself is the source.
3. Record how long it stays wet
Note approximately when the rain stops. Check the same area again after several hours and the next day. A system that clears in an hour is a different problem from ground that remains saturated for one or two days.
4. Take a short video if water is moving
A 10–20 second video showing the direction of runoff can reveal flow paths that disappear once the storm ends. Film from a safe location and avoid standing in moving or electrically hazardous water.
5. Check downspouts, basins and existing drains
Photograph where downspouts terminate, whether catch basins are full, and whether an existing French drain, dry well or buried line appears to be backing up. Do not dismantle or excavate a system just to document it.
6. Document what happens inside the house
If basement dampness or seepage appears during the same storm, photograph the location and note whether it occurs at the same wall or corner as the exterior pooling. Significant structural cracking or active flooding may require evaluation beyond yard drainage.
A simple timeline is surprisingly useful
| When | What to record |
|---|---|
| During or immediately after rain | Where water is moving, entering, backing up or pooling |
| A few hours later | Which areas have cleared and which remain wet |
| The next day | Soft turf, standing water, full basins or recurring foundation dampness |
| After several storms | Whether the same flow path or low spot repeats consistently |
Use official local information before digging
Town of Islip Engineering
The Town publishes separate Engineering materials for land grading, plot plans, site work, retaining walls and other scopes. A drainage project should be checked against the requirements that actually apply to the planned work rather than assuming every project is exempt or every project needs the same permit.
Town Engineering documentsNew York 811
New York 811 states that excavators and contractors working in Nassau and Suffolk Counties must contact 811 at least two working days before mechanized digging or excavation. Utility owners then have the required marking period before excavation begins.
New York 811 excavator FAQUSGS Long Island hydrogeology
USGS describes Long Island as being underlain by deposits that include gravel, sand, silt and clay, with groundwater and subsurface conditions varying across the island. That is why a drainage design should be based on the actual property rather than a blanket claim about Long Island soil.
USGS Long Island framework mappingMatch the evidence to the next guide
Frequently asked questions
What should I photograph after heavy rain?
Photograph the widest view of the wet area, where the water appears to enter, nearby downspouts, the grade beside the house, catch basins or dry-well inlets, and any interior dampness that occurs at the same time. A short video showing the direction of moving water can be even more useful than a still image.
How long should I track standing water after the rain stops?
Record roughly when the rain ends and check the same area again after a few hours and the next day. Whether a low spot clears quickly or remains wet for 24 to 48 hours helps a contractor understand how persistent the problem is.
Should I dig to see where an old drain goes?
Do not start mechanized digging simply to investigate a buried drainage line. In Nassau and Suffolk Counties, excavators and contractors must contact New York 811 at least two working days before mechanized excavation. A contractor can determine the appropriate investigation method for the property.
Does every drainage project in Islip need a permit?
No blanket rule applies to every residential drainage project. The Town of Islip Engineering Division publishes separate materials for land grading, plot plans, site work and other scopes. Permit applicability should be checked for the actual work being proposed.