Brockworth is at real risk of flooding, but almost none of it comes from rivers or the sea. On the official river maps, the village is dry. On the wider measures, which include rain with nowhere to go, about one postcode in five rates high. Another quarter rate medium. The danger here falls out of the sky and collects in the street, and a buyer who only asks about rivers will hear a reassuring answer to the wrong question.
The Environment Agency puts 0% of Brockworth's postcodes in flood zone 3, its highest-probability band for rivers and the sea, and 0% in flood zone 2, the medium-probability fringe beyond it. The agency's separate property-level list of river and sea risk names 24 properties across two postcodes, seven of them at medium risk and none at high. The village takes its name from the Saxon word for a brook, and the brook turns out to be the least of its worries.
Surface water is a different matter. It is what happens when heavy rain arrives faster than drains and soil can take it, and the water pools in roads, gardens and the low corners of estates. That risk does not show up on a river map at all, which is exactly why it catches people out on new-build streets that look nowhere near water.
Looking ahead, the Environment Agency's climate-adjusted flood zone, which allows for heavier rainfall and higher rivers in future, also covers 0% of Brockworth's postcodes. On rivers, the forward look matches the present one.
Insurers price the whole picture, surface water included, and a postcode with a high surface-water rating can carry a higher premium or tighter terms even when the river maps are spotless. The risk is patchy across the village, so get an indicative buildings insurance quote on the exact address early, while walking away still costs nothing.
Across all of Brockworth's postcodes, about 22% rate high on at least one of several flood measures, about 25% rate medium and about 50% rate low. Those measures sit side by side, rivers and sea alongside surface water, and a postcode only needs one of them to earn its rating. With the river zones empty, it is the other measures doing the rating here.
On defences, the Environment Agency's modelled high-risk river-and-sea extents cover 0% of postcodes whether defences are counted or not. Nothing stands between Brockworth and a river because, on the model, no river is coming. A defence in a model is a line on a map in any case, and no line on a map stops rain running down a cul-de-sac.
The nearest coast is more than 5 kilometres away, and the shoreline plan covering it sets a policy of holding the line at 20, 50 and 100 years. Holding the line means the stated intention is to keep defences where they are. That intention depends on money nobody has yet committed, and it describes what the plan hopes to do, with no bearing on what stands there today.
The nearest tide gauge in the national record is at Portsmouth, a long way south, where the sea rose by about 2 millimetres a year between 1962 and 2023. That is the rate the gauge measured over those years, and it says more about the Solent than about anywhere a Brockworth bus could reach.
The Environment Agency's historic flood map records no flooding in the area. That is a fair comfort, though a record only holds what someone wrote down, and surface-water flooding on a residential street is the kind of event that often goes unrecorded.
Flood risk is one of Brockworth's weaker points, entirely because of surface water. The village is safe from rivers and exposed to rain, and the right street matters more than the right postcode.