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Why is a Topographical Survey Crucial for Your Drainage Design?

  • martinyoung5
  • Apr 4
  • 1 min read

As drainage design experts, there's one question we're asked frequently: "Why do we need a topographical survey for every project?"


Here's why it's non-negotiable 👇

1. Gravity is Your Best Friend

• Drainage systems rely on gravity for efficient water flow

• Accurate ground levels ensure proper pipe gradients

• Prevents costly design modifications during construction


2. Technical Precision Matters

• Water authorities require specific gradients:

 - 1:80 for foul drainage

 - 1:100 for surface water

• Connects seamlessly to existing infrastructure

• Ensures compliance with local regulations


3. What We Need in Your Survey

• DWG and PDF formats

• OS National Grid referenced

• Spot levels across the site

• Existing features and services

• Current drainage infrastructure


💡 Pro Tip: A proper topographical survey isn't an extra cost - it's an investment that prevents expensive mistakes and delays during construction.


 
 
 

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