Proper drainage is essential for protecting any asphalt surface, including parking lots. When water is allowed to sit on top of the asphalt, it can contribute to potholes, cracks, erosion, deterioration, and premature pavement failure. 

Sufficient parking lot drainage helps prevent water from weakening the asphalt surface and penetrating the pavement base, protect nearby landscaping, extend the useful life of the parking lot, and reduce long-term repair costs. 

If you’re a property owner or manager, keep reading to learn some common parking lot drainage problems you may encounter, some signs to look out for, and how the team at Precision Asphalt Maintenance can help you address them. 

1. Standing Water and Ponding

Without proper parking lot drainage, water can collect in low spots after rain or snow, especially if the pavement is uneven, has settled, or is improperly graded. Prolonged ponding can accelerate asphalt deterioration, shortening the lifespan of your parking lot. The solution is to correct grading issues, repair low areas, and ensure nearby drains are functioning properly. 

2. Clogged or Blocked Storm Drains

Leaves, trash, sediment, and other debris can prevent water from being able to flow freely through drains. This can cause the water to back up onto the parking lot. To prevent this, schedule routine drain cleaning and remove debris from catch basins and drainage inlets. 

3. Poor Parking Lot Grading

A parking lot needs the proper slope to be able to direct water toward drains. Improper grading can trap water in other areas of your parking lot. If this happens every time it rains, regrading or asphalt repairs may be necessary to restore the intended drainage pattern. 

4. Damaged or Deteriorated Drainage Structures

Another common parking lot drainage issue is damaged or deteriorated catch basins, grates, pipes, or drainage channels. This damage can interfere with runoff and create safety hazards for vehicles and pedestrians. If you notice deteriorating drainage structures, repair or replace them as soon as possible. 

5. Cracks Allowing Water Into the Pavement

Water can enter through cracks in the pavement and infiltrate the pavement base, eroding the underlying structure. In colder climates, freeze-thaw cycles can make the cracks worse and quickly deteriorate the asphalt. Make sure you seal cracks promptly and address underlying drainage problems to prevent further issues.

6. Erosion Around the Parking Lot

Improperly directed runoff water can wash away soil around pavement edges, curbs, landscaping, or drainage structures. This erosion can eventually undermine the asphalt, leading to major damage in the future. The solution is to improve runoff management, stabilize eroded areas, and repair compromised pavement edges. 

7. Drainage Problems Along Parking Lot Edges

Water may accumulate where asphalt meets curbs, sidewalks, landscaping, or adjacent properties, especially if the transitions are poorly designed. The solution to this parking lot drainage problem is to correct the slopes, improve drainage pathways, and repair damaged pavement along the edges. 

Signs You Have a Parking Lot Drainage Problem

Be on the lookout for these signs that you may have a parking lot drainage problem: 

• Puddles that remain long after rainfall
• Water flowing toward buildings or entrances
• Repeated potholes in the same location
• Cracking or crumbling asphalt in low areas
• Soil erosion around pavement
• Sinking or depressed sections of the parking lot
• Overflowing or slow-draining catch basins
• Water stains or algae growth in areas that remain consistently damp

How Asphalt Maintenance Helps Prevent Parking Lot Drainage Issues

Regular asphalt maintenance is essential for helping prevent parking lot drainage issues. When you regularly inspect your pavement, you can identify any drainage problems before they have the change to cause major pavement damage. 

Furthermore, crack sealing helps keep water from entering the pavement structure, pothole repairs address areas where water may collect, and sealcoating helps protect the asphalt from moisture and weather exposure. 

Water management and pavement condition go hand in hand, which is why your maintenance should address both. 

When to Call the Professionals at Precision Asphalt Maintenance

Most asphalt repairs should be performed by professionals. Don’t treat persistent parking lot drainage issues or damaged pavement as simply cosmetic issues — call Precision Asphalt Maintenance ASAP for expert help before minor drainage issues have the chance to develop into extensive asphalt damage. We’ll evaluate the grading, pavement condition, drainage structures, and water flow to determine what steps are necessary to restore your parking lot. 

If you’ve noticed any signs of drainage issues in your parking lot, contact Precision Asphalt Maintenance today, and we’ll get you taken care of.