Higham's flood risk comes from rain, not from the river. No postcode sits in the river and sea flood zones. Roughly one in ten is flagged high risk on at least one measure once surface water is counted. No flooding has been recorded here. The Thames gets the blame in estate-agent small talk, but the drains are what matter.
On the Environment Agency's river and sea mapping, 0% of Higham's postcodes fall in flood zone 3, the high-probability band, and 0% in flood zone 2, the medium-probability band beyond it. Nothing in the village falls into either. For a place a few kilometres from the Thames estuary, that's the first number worth confirming, and it holds up.
Surface water is a different matter. When heavy rain falls faster than the ground and drains can take it, water runs along roads and pools in low spots, and river-and-sea maps don't measure that. The only figures here that include surface water are the postcode indicators set out below. They're the ones to read before you view a house on a dip in the road.
Looking ahead, the Environment Agency's climate-adjusted flood zone, which projects the river and sea zones forward under a changing climate, also covers 0% of Higham's postcodes. That forecast includes only rivers and the sea. It doesn't cover how hard the rain will fall on a given street.
For insurance, a village outside the river and sea zones is usually straightforward to cover. A postcode flagged for surface water is where an insurer may ask more questions or price in the risk. The honest way to find out is to get a quote on the exact address before you instruct a solicitor, not after exchange, when the quote is no longer something you can walk away from.
Across all 78 postcodes, counting a postcode as flagged if it rates on at least one flood measure, surface water included, about 9% rate high, 6% medium and 21% low. These bands overlap with the zone figures above and measure a broader thing, so they shouldn't be added together. A postcode that rates low on one measure can still be clear on the river and sea map, and in Higham, that's most of them.
On modelled flood extents, 0% of postcodes sit in a high-risk extent without defences, and 0% sit in one with defences. There is no modelled high-risk river or sea extent here for a defence to protect. Even where a defence does appear in a model, that only means a structure is recorded there. It's not a promise the water stays out.
Higham's nearest point is about 2.9 kilometres from the coast, and the median is about 3.6 kilometres. The shoreline management plans for this stretch are set to hold the line over 20, 50 and 100 years. That means the stated intention is to maintain the existing defences, not to retreat. A policy is a plan, not a wall, and plans depend on funding decisions that haven't been made yet.
The nearest long-running tide gauge, at Dover, recorded sea level rising about 2.2 millimetres a year across its 1961 to 2010 record. That's a measured rate from the past, not a forecast. It's the reason shoreline policies are written in decades rather than years.
No historic flooding is recorded for the area: 0% of postcodes fall within a recorded flood outline. That's reassuring, although recorded history only covers what someone mapped. A surface-water flood on one back road can go unrecorded, and the neighbours may be the better source.
Higham is middling on flood risk: clear of the river and the sea, with a surface-water flag on some postcodes that is worth checking street by street before you buy.