Parts of Hadlow are at risk, and the river is not the main problem. The river flood zones cover only a sliver of the area. Surface water reaches far more postcodes. The most recent recorded flood came from drainage that couldn't cope. The village's risk is patchy, so the address matters more than the name.
On rivers and the sea, the Environment Agency's flood zones put about 2% of the area's postcodes in zone 3, the highest-probability band, and about 1% in zone 2, the medium-probability fringe beyond it. The two bands don't overlap, which is why the outer zone can be the smaller of the two. By this measure most of the Hadlow area sits outside the river-and-sea flood zones altogether, though that is no promise about any particular street.
Surface water is a different measure and tells a different story. The Environment Agency has six recorded flood events in the area, the latest in December 2013, and that one was caused by local drainage and surface water rather than the river breaking its banks. About 2% of postcodes fall inside a recorded historic flood outline. Heavy rain on the wrong street doesn't check the flood zone map first, and a buyer who stops reading at "not in a flood zone" has only answered half the question.
The Environment Agency's climate-adjusted mapping, which allows for heavier rainfall and higher river flows in future, puts about 5% of the area's postcodes in the flood zones. That is a modelled look forward, not a forecast for any house, and it sits above today's figure.
Insurance follows the address, not the village. A home on a postcode with no flood history will usually be insured without fuss. A home on one of the affected postcodes may still be insurable, but premiums and excesses can climb, and the only reliable way to find out is to get a quote on the exact property before committing. Sellers seldom volunteer that a previous insurer declined to renew.
The postcode picture is wider once every measure is folded in. About 16% of the area's postcodes rate high on at least one flood measure, surface water included, about 13% rate medium and about 31% rate low on at least one. These overlap with the river-and-sea zone figures above and with each other. They are a different way of counting, so don't add them together.
Counting homes rather than postcodes makes the risk easier to picture. The Environment Agency's rivers-and-sea mapping lists 26 postcodes in the area that carry some risk, containing 429 properties. Of those, 27 properties are at high risk, 19 at medium, 20 at low and 19 at very low, and 12 of the high-risk properties are homes. Postcodes with no river or sea risk don't appear in this count at all.
The question most flood summaries skip is whether anything stands between the water and the house. The Environment Agency's modelled high-risk flood extent covers about 2% of postcodes without defences and about 2% with them. In other words, defences in the model do not shrink the high-risk area here. "Defended" means a defence appears in the model, not that a property is safe, and it should never be read as reassurance.
The nearest tide gauge, at Dover, recorded sea level rising at about 2 millimetres a year over its 1961 to 2010 record. That is a measured historic rate, not a prediction, and for an inland village in the Medway valley the more immediate issues are rainfall and drainage.
Before buying in the Hadlow area:
- Put the exact address into the Environment Agency's long-term flood risk service, checking both rivers and surface water.
- Get an indicative insurance quote for the property before instructing a solicitor.
- Ask the seller in writing whether the property has ever flooded or had a flood claim.
- Ask your surveyor to look at drainage, ground levels and any signs of past water damage.
Flood risk is a genuine weak spot for Hadlow. River risk is concentrated in a small number of postcodes, surface water reaches much further, and the defences in the model don't reduce the high-risk area.