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

Drainage.jpg

Land Development 101 - Land Development 101

Grading and Drainage - Essential Craftsman

Session Outline

  • Principles

Presentations