Grading and Drainage

Describing changes in heights on plans

What and why?

Grading - Is the fall across a surface. This allows for the movement of water.

Drainage - A system that deals with excess water on a site.

Different drainage systems

• Strip Drains

• Grated Pits

• Swales

• Rain gardens

• Soak pits

• Bogs

• French Drain

• agricultural drains

• Water systems

Grading

STANDARD GRADING PERCENTAGES

Lawn areas around 2-3% = 1:50 - 1:33

Paving 1.5 - 2.5% = 1:75 - 1:40

CALCULATIONS

Height change in metres = Distance Covered in meters x Percentage grade (percentage divided by 100) Percentage Grade = Height Change in metres / Distance Covered in metres x 100

Drainage

Session Outline

• Principles
  

Presentations