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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