Great Notley has no river or sea flood risk on the official maps, and its exposure comes from rain. None of it falls in a river-and-sea flood zone. Allowing for climate change does not change that. Some postcodes still rate high on surface water. The danger here comes down from the sky and gathers in the road, and no river is involved.
The Environment Agency's river-and-sea mapping puts 0% of Great Notley's postcodes in flood zone 3, the highest-probability band, and 0% in flood zone 2, the medium-probability fringe that lies beyond it. On that measure, the village is clear. A buyer who stops at the flood zone has only checked the rivers.
Surface water is a separate risk with its own mapping. It is what happens when heavy rain arrives faster than drains, gardens and verges can take it, and it collects in dips, roads and low corners of an estate regardless of how far away the nearest river runs.
The Environment Agency's climate-adjusted flood zone, which redraws the river-and-sea map for a future with more extreme rainfall and higher flows, still puts 0% of Great Notley's postcodes inside it. The forward look for rivers is as clean as the present one.
For insurance, the clean river and sea picture helps, and it is the question most insurers ask first. Where a particular postcode carries a surface-water rating, that can still show up in the quote, so the premium depends on the street more than the parish.
Across the 151 Great Notley postcodes assessed against a set of flood indicators that includes surface water alongside rivers and the sea, about 15% rate high on at least one of them, about 22% medium and about 44% low. A postcode only needs one measure to flag it, and in a place with no river or sea zone to speak of, surface water is doing most of that flagging. Put the exact postcode into the Environment Agency's long-term flood risk service and read the surface-water result, because that is the line where the risk for any given house shows up.
The modelled flood extents put 0% of postcodes in the high-probability extent with a defence present and 0% without one. There is nothing to defend against on the river model, so the question of whether a wall stands in the way never arises. That is a statement about rivers and the sea, and it says nothing either way about rain running off a road.
The Environment Agency's historic flood records cover 0% of Great Notley. Recorded flooding is what someone wrote down, so an empty record is good news while still falling short of proof that water has never come up a drive. Most of the houses are recent, which also means the record has had fewer years to fill.
Great Notley's flood risk is middling: rivers and the sea leave it alone, while surface water flags enough postcodes that the address, and not the parish, decides which kind of buyer you are.