At OAL Engineering, we provide precise and code-compliant Drainage Plans to support effective site development and ensure water is safely managed on and around your property. A drainage plan is essential for controlling surface water runoff, protecting structures, and avoiding water-related damage to neighboring lots or infrastructure. Whether you are planning a new build, an addition, or a site redevelopment, most municipalities require a drainage plan as part of the permit approval process.

Our drainage plans are carefully designed based on site surveys, topography, soil conditions, and municipal stormwater requirements. They show how water will flow across the site and identify the systems or contours that will guide it away from buildings, driveways, and other key features.

Each drainage plan from OAL Engineering typically includes:

• Site grading contours to direct runoff to appropriate discharge points
• Flow arrows showing the direction of surface water movement
• Locations of swales, ditches, catch basins, and storm drains
• Existing and proposed elevations around buildings and lot boundaries
• Integration with stormwater management systems and municipal infrastructure