Deanshanger does carry a flood risk, and nearly all of it comes from rain with nowhere to go. The river and sea maps barely touch the village. Once surface water is counted, around a fifth of its postcodes carry a high flag. Rain falls on every street, so the problem can turn up anywhere, a road at a time.
The Environment Agency's river-and-sea flood zones cover 0% of the area's postcodes, both in zone 3, the highest-probability band, and in zone 2, the medium-probability fringe beyond it. The agency's property-level list of river and sea risk names one postcode, with 11 properties on it. One of those is rated very low risk and none are rated high. Kings Brook and the Great Ouse are part of the landscape and stay out of the kitchen.
Surface water is a different story. It is what happens when heavy rain arrives faster than drains, gardens and ditches can take it away, and a river is not needed for it. In Deanshanger that is where the flags on the flood map come from. "Outside the flood zone" is a true description of the village, and it was only ever a statement about rivers and the sea.
The Environment Agency's climate-adjusted version of the river-and-sea zones also covers 0% of postcodes. That is a modelled projection of where river and sea flooding could reach under a changing climate. It tells you nothing about surface water.
For insurance, river-and-sea zone figures like these normally help. A surface-water flag on a particular postcode can still move a premium or add an excess, and insurers price by postcode, so the village average gives you no protection. Ask for an indicative buildings quote on the exact postcode early, while walking away is still free.
On the postcode flood indicators, which count a postcode if it rates high, medium or low on any one of several measures, surface water included, about 22% of Deanshanger's postcodes come out high on at least one. Around 25% come out medium and 41% low. These shares are a different measure from the zones above, and they are where the village's risk shows up.
In the modelled high-risk flood extents, 0% of postcodes fall in an undefended area and 0% in a defended one. Being "defended" would only mean a defence appears in the model, which promises nothing about any particular house. Here the question barely comes up, because the river-and-sea extents do not reach the village. Defences on the ground are no help against surface water.
The nearest tide gauge to the village is in Portsmouth. It recorded sea level rising at about 2 millimetres a year between 1962 and 2023. For a village this far inland, that is a fact about Portsmouth.
None of the area's postcodes falls inside the Environment Agency's historic flood outlines. The record does list three flood events for the area, the latest in 1980, when a channel overtopped where there were no raised defences. Little recorded history is a comfort. It also means that small floods in back gardens may never have been written down.
The flood risk here is below average. The rivers leave Deanshanger alone, and the problem is surface water, which can land on any street and which the usual flood-zone answer leaves out.