Yes, but Iwade's main flood risk comes from rain, not from the rivers or the sea. Hardly any postcodes sit in the river-and-sea flood zones. About one in five rate high on at least one flood measure. Nobody plans to build defences along the nearby shoreline. A small river risk and a small flood risk are two different claims, and only the first one is true here.
Start with rivers and the sea. In the Environment Agency's river-and-sea flood zones, about 1% of the area's postcodes are in zone 3, the highest-probability band. About 2% are in zone 2, the medium-probability fringe beyond it. The two bands don't overlap, so zone 2 being the bigger number is no contradiction. On this measure alone Iwade looks close to dry, and that's the version a seller will be happy to show you.
Surface water is where the picture changes. That's rain arriving faster than the ground and drains can take it, and on low, flat land near the Swale marshes it doesn't need a river to cause trouble. The river-and-sea zones leave it out completely. About 3% of postcodes have a recorded historic flood. The Lower Medway Internal Drainage Board, whose job is managing water levels on low-lying land, covers about 8% of postcodes. The Environment Agency has three recorded flood events here, the latest in October 2000, when a main river overflowed where there were no raised defences.
Looking ahead, the Environment Agency's climate-adjusted flood zone takes in about 3% of postcodes. That's a modelled look at how the river-and-sea zones stretch as the climate shifts, not a forecast for any particular street.
For insurance, a house outside the river-and-sea zones can still get a surface-water loading, so the zone number alone won't predict your quote. Newer homes, which is most of Iwade, are priced on their own risk by each insurer. Get a real quote on the exact address before you commit money to anything else.
At postcode level, and counting surface water alongside rivers and sea, about 22% of postcodes rate high on at least one flood measure. Another 19% rate medium and about 41% rate low. These bands overlap with the zone figures above, so the two sets can't be added together. They're the fuller version of the same question, and they're why Iwade's flood risk rates worse than its dry-looking zone map suggests.
The Environment Agency's rivers-and-sea mapping also counts properties, not postcodes, and only lists postcodes carrying some risk. Five postcodes appear, covering 117 properties. Of those, 2 are at high risk, 22 at medium risk and 19 at low risk. Both high-risk properties are homes. The count is small, but it's a count of houses, and if yours is one of them the zone percentages won't help.
On defences, about 1% of postcodes fall in the high-risk extent with no defence in the model, and the same 1% again fall in the high-risk extent with a defence present. "Defended" only means a defence exists in the modelling. It says nothing about whether that defence would hold on the night.
The shoreline management plan for this stretch is "no active intervention" at every horizon: 20, 50 and 100 years. That means there's no stated intention to build or maintain defences on the nearest coast, which is about 1.3 kilometres from the typical postcode. The plan is a statement of intent, and here the stated intent is to leave the shoreline alone.
The nearest tide gauge, at Dover, recorded sea level rising by about 2.2 millimetres a year across its 1961 to 2010 record. That's a measured past rate, not a prediction.
Before you make an offer:
- Put the exact address into the Environment Agency's long-term flood-risk service and check the surface-water result, not only rivers and sea.
- Get an indicative buildings-insurance quote on that address before you instruct a solicitor.
- Ask the seller directly whether the property has ever flooded or made a flood claim.
- Check whether the address falls in the Lower Medway Internal Drainage Board's area.
Flood risk is Iwade's weak spot. The rivers and the sea are a minor factor, but surface water puts enough postcodes at high risk that every buyer should check their own address before making an offer.