Aveley has a middling flood risk, and most of it is on one edge of the village. About one postcode in twenty is in the highest river-and-sea flood zone. Eighteen properties are rated high risk from rivers and the sea. The last recorded flood came in from the sea, a long time ago. Most of Aveley is dry ground, and the wet edge is small and easy to find on a map.
On the Environment Agency's river-and-sea flood zones, about 5% of Aveley's postcodes are in Zone 3, the highest-probability band, and under 1% are in Zone 2. Zone 2 is a separate fringe just beyond Zone 3 and doesn't include it, which is why it can be the smaller figure. These zones cover rivers and the sea and nothing else.
Rain with nowhere to go doesn't get a separate figure for Aveley. It's counted in the wider postcode measure below, which is why that measure reaches much further than the river-and-sea zones.
The Environment Agency's climate-adjusted mapping widens the flood zone to about 6% of Aveley's postcodes. That's a modelled zone growing under a changing climate. It doesn't give a date when any particular street floods.
For insurance, the line that matters is the exact postcode. A house in Zone 3 can expect more questions and probably higher premiums, and a house outside it on the same road may barely notice. Insurers price the specific house, and a description saying "Aveley" tells them nothing. The practical step is to put the exact address into the Environment Agency's long-term flood risk check and get an indicative insurance quote while the purchase is still easy to walk away from.
Counting postcodes rated on at least one of several flood measures, surface water included, about 8% of Aveley's are high risk on at least one, 10% medium and 32% low. Each postcode is rated on whichever measure scores it worst, so this count runs well beyond the river-and-sea zones and shouldn't be added to them.
The more useful number is homes. The Environment Agency's rivers-and-sea mapping lists 270 properties in Aveley postcodes that carry some risk: 18 at high risk, 8 at medium, 15 at low and 197 at very low. Postcodes with no river or sea risk at all aren't counted, so most of the village isn't in those 270. Of the 18 high-risk properties, 12 are homes.
Whether anything stands between the water and those homes is the next question. About 4% of Aveley's postcodes are inside the high-probability modelled flood extent with no defence in the model, and under 1% are inside it where a defence is modelled. A modelled defence only means there's a wall or bank on the map. It says nothing about whether that wall or bank will hold. Five floods are on record here, the most recent from the sea in 1953.
The nearest tide gauge with a long record, at Dover, measured sea level rising by about 2 millimetres a year between 1961 and 2010. That's a past rate at one gauge on another stretch of coast. Aveley gave its name to an interglacial, a warm spell between ice ages, so the village has form on the sea moving.
Aveley's flood risk is middling: most homes aren't affected, but a small group of postcodes at the edge carries real risk, and buyers there need the exact address checked.