Water pooling in a parking lot usually means the surface is no longer draining properly due to settlement, deterioration, or a grading problem. Left unaddressed, standing water accelerates pavement deterioration significantly and creates ice hazards in winter.
Common Causes
- Settlement or surface deformation. Sections of the lot have settled or shifted over time, creating low spots where water collects instead of draining.
- Improper original grading. If the lot was not graded correctly when it was originally paved, water has always pooled in certain areas. Resurfacing without correcting the grade will reproduce the same problem.
- Base failure in specific areas. When the base beneath a section of pavement fails and that section sinks, the surrounding areas drain toward it.
- Blocked or failed catch basins. Catch basins and drainage inlets that are clogged, damaged, or set at the wrong elevation prevent water from exiting the lot as designed.
- Surface deterioration. As asphalt ages and loses flexibility, it can develop surface irregularities that trap water in areas that previously drained.
Why It Matters
Standing water in a parking lot is not just a nuisance. Water that sits on the surface works its way into existing cracks, weakens the base, and accelerates deterioration. In cold months it freezes, expands, and breaks the pavement apart from beneath. Over time, a drainage problem that costs little to correct early becomes a structural problem that requires significant rehabilitation.
How It’s Fixed
The correct fix depends on the cause. A site evaluation identifies whether the issue is grading, base settlement, catch basin failure, or surface deterioration. Possible solutions include regrading during resurfacing, catch basin repair or replacement, localized base repair in settled areas, or full depth reclamation in sections where the structure has failed. Patching the surface without addressing the drainage cause will reproduce the problem.
Frequently Asked Questions
Can I fix standing water without repaving?
Depending on the cause, yes. If the problem is a blocked or damaged catch basin, that can often be repaired independently. If the problem is grading or base settlement, the pavement surface typically needs to be addressed at the same time drainage corrections are made.
How do I know if it’s a grading problem or a catch basin problem?
A site evaluation will determine the cause. If water is pooling far from any drainage inlet, grading or settlement is the more likely cause. If water is pooling around or near a catch basin that isn’t draining, the catch basin itself is the likely culprit.
Is standing water a liability?
Yes. Standing water that freezes creates slip and fall hazards for pedestrians and increases the risk of vehicle accidents. Commercial property owners have a responsibility to maintain safe conditions on their property.
Does US Asphalt handle drainage corrections as part of paving projects?
Yes. US Asphalt addresses drainage and grading as part of every paving project. Correcting drainage at the time of paving rather than after the fact is standard practice on every job.
US Asphalt handles drainage correction and commercial paving across the Boston metro. Call (855) 246-8867 for a site evaluation.
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