Yes. Chafford Hundred carries a serious flood risk, and most of it is rain. About one postcode in six falls in the highest river-and-sea flood zone. Allow for climate change and that becomes more than a third. Count surface water too, and most postcodes are flagged high on something. The estuary gets the attention and the rain does most of the damage.
On the Environment Agency's river-and-sea mapping, about 15% of the area's postcodes are in flood zone 3, where the chance of flooding is highest, and a further 18% are in flood zone 2, the medium-probability band outside it. The two zones don't overlap, so zone 2 being the larger figure is just how the fringe falls here. For a new estate on the Thames side of Thurrock, around a third of postcodes in either zone is more than a buyer expects from new-build brochures.
The river-and-sea zones leave out water that never goes near a river, and an estate of roofs, roads and old quarry floors produces plenty of it. When heavy rain falls faster than the drains can take it, it pools where the ground is lowest, wherever the nearest river happens to be. The Environment Agency's records list 27 flood events in and around the area, and about 6% of postcodes fall inside a recorded past flood outline.
The Environment Agency also models the zones with an allowance for climate change. On that version, about 37% of postcodes fall within the flood zones. This shows what the mapping expects as sea levels and rainfall shift. No street here is guaranteed to flood.
Insurance is where this turns into money. A postcode in a modelled flood zone can mean higher premiums, a larger flood excess, or insurers who only quote after asking more questions. Get a buildings insurance quote on the exact address early in the process, before the survey fee is spent.
The wider postcode-level picture combines several measures, rivers, the sea and surface water among them, and flags a postcode if any one of them applies. On that basis, about 86% of postcodes here rate high on at least one measure, 44% medium on at least one, and 56% low on at least one. One postcode can show up in more than one of those groups. The 86% is the figure that catches buyers out, because the river-and-sea zone map they saw first looked a good deal tidier.
Counting homes is more precise. The Environment Agency's rivers-and-sea risk register lists 4,128 properties here, and it only includes postcodes carrying some risk. Of those, 19 properties are at high risk, 80 at medium, 335 at low and 2,457 at very low, and 7 of the high-risk ones are homes. Those numbers are small, but being one of those 7 doesn't get any better because the other homes are fine.
On defences, about 15% of postcodes fall within the modelled high-risk extent with no defence in the model, and well under 1% fall within it with a defence present. "Defended" only means the Environment Agency's model includes a wall or embankment somewhere nearby. It says nothing about whether the water stays out of a given kitchen. On this estate, the model rarely includes any defence at all.
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 is the rate the gauge recorded over those years, and the last flood from the sea on the Environment Agency's record here dates from 1953.
Flood risk is one of Chafford Hundred's weak points. The river-and-sea zones cover a fair share of the estate, and the rain flags cover most of the rest.