Flood Risk & Drainage Articles & Guides
Practical guides, technical explanations and planning advice from our flood risk and drainage consultants.
Do I Need a Flood Risk Assessment for a House Extension?
Find out when an FRA is required for a residential extension or home improvement project and what it involves.
Read article →EA Flood Map for Planning Updated March 2025: What Changed?
The Environment Agency updated its flood map with new NaFRA data in March 2025. What changed and what does it mean for your site?
Read article →How Much Does a Flood Risk Assessment Cost in 2025?
A transparent guide to FRA costs by flood zone and development type, with tips on what to look for when comparing quotes.
Read article →What Is Greenfield Runoff Rate — and Why Does It Matter?
A plain English explanation of greenfield runoff rate, how it's calculated and why LLFAs require it for drainage strategies.
Read article →The 6 Most Common LLFA Drainage Objections and How to Fix Them
The six drainage objection reasons we see most often from LLFAs, and the technical evidence needed to resolve each one.
Read article →What Is SuDS? A Plain English Guide to Sustainable Drainage
Everything you need to know about Sustainable Drainage Systems — what they are, why planning needs them and what they look like in practice.
Read article →
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