Civil Engineering · Grading & Drainage

Grading and Drainage Engineering

Site grading and drainage engineering directs storm runoff away from buildings, toward collection inlets and outfalls, and through the drainage system to the storm sewer or downstream watercourse. Correct grading and drainage design prevents flooding, foundation damage, and erosion — and is required by most building departments.

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What This Engineering Scope Covers

Site grading design to direct drainage away from buildings
Storm inlet sizing and layout
Storm sewer pipe sizing and design
Surface drainage analysis — drainage areas and flow paths
Low-impact development (LID) drainage design
Swale and vegetated drainage channel design
Detention and retention basin design
Outfall design and erosion protection
Pre- and post-development runoff calculations
Drainage compliance with local design standards

What You Get

Grading and drainage plan
Storm drainage calculations
PE-stamped civil permit drawings
Drainage compliance documentation
Civil permit package

How Apex Grid Handles This

Apex Grid Engineering is licensed in 49 states — every U.S. state except Alaska. Engineering stamping and licensure are confirmed for each project jurisdiction. We provide grading and drainage engineering as a standalone service or coordinated with structural, MEP, civil, and geotechnical engineering under one contract.

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Frequently Asked Questions

What does grading and Drainage Engineering cover?

This scope covers site grading design to direct drainage away from buildings, storm inlet sizing and layout, storm sewer pipe sizing and design, and surface drainage analysis — drainage areas and flow paths.

What deliverables come with grading and Drainage Engineering?

Deliverables include grading and drainage plan, storm drainage calculations, PE-stamped civil permit drawings, drainage compliance documentation, and civil permit package.

Can this service stand alone?

Grading and Drainage Engineering is provided as a standalone service or coordinated with structural, MEP, civil, and geotechnical engineering under one contract.

Who stamps the engineering for this scope?

Apex Grid Engineering is licensed in 49 states — every U.S. state except Alaska. Engineering stamping and licensure are confirmed for each project jurisdiction.

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