Parking Lot Drainage: What to Document Before a Site Visit
Before a parking lot drainage evaluation, document where water collects, how it moves across the property, and what maintenance or repairs have already been attempted. Share dated photographs and an access plan with your contractor. These observations help frame the evaluation; they do not replace an on-site assessment of grades, drainage structures, and pavement condition.
Start with a simple property record
Mark recurring problem areas on a property map: entrances, loading areas, walking routes, and spaces near buildings. Record when you noticed the water and whether the photograph was taken during rainfall or afterward. If you can safely observe the same location later, a second photograph can help show whether the condition changed. Avoid stepping into moving water or entering a drainage structure to investigate.
Keep observations separate from conclusions. A note such as ‘water remained beside the loading entrance the following morning’ is more useful than deciding in advance that the property needs a particular drain. Include older photographs if you have them, and identify any recent paving, landscaping, or building work.
Bring maintenance history and operating constraints
Gather available drainage plans, cleaning records, and the scope of previous pavement repairs. List the locations that must stay accessible for deliveries, employees, and visitors. For a commercial property, discuss whether an evaluation or subsequent work would need to be phased around business hours.
Ask the contractor to explain what is known, what still needs investigation, and how any proposed work addresses the observed problem. A clear proposal should distinguish the drainage work from associated pavement restoration and describe access arrangements. This makes it easier to compare scopes instead of comparing only a total price.
Consider where the water goes
The EPA explains that runoff from paved surfaces can carry sediment, oil, and other pollutants into receiving waters. Drainage planning therefore involves more than moving a puddle away from a parking space. Ask how the proposed approach fits the property's drainage system and where runoff will discharge. The EPA stormwater resource below provides general background, not a site-specific design.
Milliken Corporation offers both asphalt and drainage services, including storm drains and trench drains. Its published service-area information covers commercial work throughout Tennessee and into neighboring states. For a property in Nashville, Gallatin, Hendersonville, or beyond, provide the address and project type when requesting an evaluation so the team can confirm coverage and scope.
Frequently asked questions
Do I need to know which drainage system to request?
No. Start with the symptoms, photographs, and property history. The appropriate approach depends on the site assessment rather than the name of a particular drainage product.
Can photographs replace an on-site evaluation?
Photographs help explain the problem, but they do not establish grades, pipe conditions, or a complete repair scope. Treat them as preparation for the evaluation.