Long Hanborough's flood risk is moderate, and it comes from rain. No river or sea flood zone reaches the village. A small number of postcodes still show high risk on at least one measure. Most of the village is clear. The risk is real, but it is limited to particular streets.
The Environment Agency's river-and-sea flood zones leave Long Hanborough out altogether. None of the area's postcodes falls in Flood Zone 3, the highest-probability band, and none falls in Flood Zone 2, the medium-probability band outside it. The River Evenlode runs past Combe, one of the neighbouring villages this page also covers, and the zones put it well clear of Long Hanborough's houses.
That leaves surface water, which comes from heavy rain that drains cannot handle quickly enough, not from a river bursting its banks. It depends on slopes, kerbs and drains, and it can affect one house while missing the house opposite. River-zone maps do not measure it, so a clean river result tells you nothing about a summer cloudburst.
The Environment Agency's climate-adjusted flood zone, which models how the river-and-sea zones could spread with future climate change, also covers none of the area's postcodes. Even after the modellers add extra water for climate change, it still does not reach the village.
For insurance, being outside the river and sea zones is the result buyers want, and it should keep the main flood question on a quote simple. Insurers now map surface water as well, so a property on one of the higher-risk postcodes may still face questions. Read the quote with that in mind.
The postcode-level picture combines several flood measures, surface water among them, and records the worst rating each postcode gets on any of them. On that basis, about 5% of the area's postcodes are high risk on at least one measure, about 11% are medium and about 31% are low. Because one bad rating is enough, these shares are always higher than any single measure would give. Put the exact address into the Environment Agency's long-term flood risk service and look at the surface water result, because no village-wide share can tell you which side of the line a particular house is on.
The Environment Agency's modelled flood extents put none of the area's postcodes in high-risk land, defended or undefended. A flood defence only counts in the model when there is modelled river water for it to hold back. In Long Hanborough there is none, so no defence is doing any work.
The nearest tide gauge is at Portsmouth, where sea level rose by about 2 millimetres a year between 1962 and 2023. That is a measurement taken on the south coast, and it matters to an inland Oxfordshire village mainly as a reminder of how far the sea is.
The Environment Agency's historic flood map shows no recorded flooding in the area. That is reassuring. It only covers floods that someone recorded, so a flooded road or garden that nobody reported would not appear.
Flood risk in Long Hanborough is middling. The rivers and the sea are not the problem, and the risk depends on rain and which street a house is on.