Drainage & Grading

Grading

Construction documents submitted with an application for new construction of, or substantial improvements to a single family dwelling shall be accompanied by a lot grading plan demonstrating that storm water runoff will not adversely impact adjacent properties. 

All structures exceeding one story in height shall be required to incorporate gutters and downspouts to collect and direct runoff to ground level, or below ground level if discharge to a below grade structure.

Drainage

Drainage plans are a vital component of any construction project. Proper drainage is essential for guiding surface runoff away from structures, protecting foundations, landscapes, and surrounding areas from water damage. Without a comprehensive drainage plan, potential issues such as flooding, erosion, and structural deterioration can arise, causing costly delays and repairs.

Here, you will find the necessary forms and guidelines for contractors to follow, ensuring that all work complies with local standards and promotes long-term site sustainability. Whether you’re planning a new build or managing an existing property, we’re here to help make the process as smooth and efficient as possible.

Drainage Calculator

Where swales are not sufficient to capture the required retention, then other retention practices may be used. This retention volume should be calculated with the design criteria of a Florida registered licensed professional engineer. 

Impervious surfaces

Impervious surfaces are those that don’t absorb water: driveways, structures, patios, swimming pools –  , therefore to provide adequate drainage and reduce the exposure of flood hazards and to prevent adverse impact to adjacent properties from stormwater runoff, the following calculator can be used as a guidance to calculate areas of retention that would be required due to imperviousness.

Resources

Swale Cross Section Detail
Impervious Worksheet
Stormwater Manual
Stormwater Brochure