Flood Risk Assessment: Everything You Need to Know

A flood risk assessment helps you find out if water will damage your home and is often required to get building permission.

What is a Flood Risk Assessment?

A Flood Risk Assessment (FRA) is a detailed report. It looks at a piece of land or a building. It checks if that land might flood now or in the future.

The report looks at many things. It looks at the history of the area. It looks at how high the land is compared to nearby water. It also looks at how much rain falls. Modern reports use smart maps to make these checks very accurate.

Why do you need one?

You usually need this report for two main reasons:

  1. To get permission to build: If you want to build a house or an extension, the government needs to know it is safe from water.
  2. To get insurance: Insurance companies want to know the risk before they agree to cover your home.

Who writes these reports?

For simple projects, you can look at a government map yourself. But for big projects, you need an engineer. They use computers to see exactly where water will flow during a big storm.

The 3 Main Types of Flooding to Know

Not all floods come from the same place. It is important to know where the water starts.

River Flooding (Fluvial)

This happens when a river gets too full. The water spills over the banks and onto the land. This is the most common type of flood people think about.

Surface Water Flooding (Pluvial)

This happens when it rains very hard and very fast. The ground or the drains cannot soak up the water quickly enough. The water then sits on top of the roads or flows into garages. This is a big problem in cities because there is a lot of concrete and not enough soil.

Coastal Flooding

This happens near the ocean. High tides and strong winds push sea water onto the land. This can be very dangerous because of the salt and the force of the waves.

How to Get a Flood Risk Assessment

Getting an assessment is a step-by-step process. Follow these points to stay safe.

Step 1: Check free government maps

Start by looking at your local government website. They have maps that show Flood Zones.

  • Zone 1: Low risk of flooding.
  • Zone 2: Medium risk of flooding.
  • Zone 3: High risk of flooding.

Step 2: Hire a professional for a “Site-Specific” report

If your land is in Zone 2 or 3, you need a special report. An expert will visit your property. They will check the height of your floors. They will also make sure your new building does not make flooding worse for your neighbors.

How Flooding Affects Planning Permission

The rules for building are very strict. The government wants to make sure people do not build homes that will just get ruined by water.

The Sequential Test: Can you build somewhere else?

Before you build in a flood area, you must prove there is no better spot. The “Sequential Test” asks: “Is there a drier piece of land nearby?” If the answer is yes, you might be told to build on the drier land instead.

The Exception Test: Can you make it safe?

If you must build in a flood area, you have to pass the “Exception Test.” You must show that the building provides a big benefit to the local town. You also have to show that the building will be safe and dry for a long time.

Simple Ways to Protect Your Property

If your report says you have a risk, do not worry. You can do things to stay dry.

  • Raise your floor: Build the house on a higher platform or stilts.
  • Use water-proof materials: Some bricks and seals do not let water through.
  • Move your plugs: Put your electrical outlets and wires higher up on the wall.
  • Plant a garden: Grass and trees soak up water. Concrete does not.

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Frequently Ask Question

The price changes depending on the size of the land. A simple report for a house might cost a few hundred dollars. A big report for a new neighborhood can cost thousands.

You can check the basic maps yourself to see the risk. However, for a formal planning application, the council usually requires a report from a professional engineer.

No. Weather patterns change over time. It is best to get a new report if your old one is more than two years old to make sure the data is still correct.

Not always. Most reports suggest ways to fix the problem. You might just need to change your building design to keep the water out.

In many urban areas, surface water from heavy rain is the most common cause because the water has nowhere to go.

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