Yes, and flood risk is the weakest part of Mitcheldean's record. About four in ten postcodes are in the highest-risk river-and-sea flood zone. The zone below it is empty. Dozens of properties are rated high risk. The one comfort is that no flood is on record, and that matters a little less than it sounds.
The Environment Agency's river-and-sea mapping puts about 41% of Mitcheldean's postcodes in Flood Zone 3, the highest-probability band. Zone 2 is the medium-probability margin beyond Zone 3, and it holds none of them. The line between the two zones is sharp: a postcode is either in the high-risk band or out of the river-and-sea zones altogether. That makes the boundary matter more to a buyer than the average.
Surface water is the rain that floods roads and gardens before any river rises. The Environment Agency's mapping, as carried here, has no separate surface-water figure for Mitcheldean. Surface water is folded into the combined postcode measure further down this answer.
The Environment Agency also has a climate-change version of the flood zones, and it puts about 41% of postcodes inside the zone. That is the same share as today's map. On these figures, a warmer future does not make the risk any wider. Most of the at-risk ground is already counted.
For insurance, a home in Flood Zone 3 is the kind of property an insurer asks extra questions about. That can mean a higher premium, a bigger excess or fewer insurers willing to quote. Put the exact address into the Environment Agency's long-term flood risk service and get a quote while you are still negotiating on price. A mortgage lender may well ask for both.
A wider measure checks each postcode against several flood indicators, surface water included. A postcode counts if it is at risk on any one of them. On that basis, about 44% of Mitcheldean's postcodes are at high risk on at least one measure, about 6% at medium risk and about 16% at low risk.
In properties, the Environment Agency's rivers-and-sea mapping lists 324 properties in the postcodes that carry some risk. Sixty-eight are at high risk, 45 of them homes, eight at medium risk and nine at low. Postcodes with no river or sea risk are left out of that list, so the 324 is the at-risk part of town, not the whole town. If you are buying one of those 68, the town-wide percentage is no help.
The flood-extent model puts about 41% of postcodes in the high-risk extent when defences are included, and about 41% when they are left out. A defence appearing in the model does not make a property safe, and on Mitcheldean's figures the defences do not shrink the high-risk area at all. Any seller who mentions flood defences should be asked which ones, and what difference the model says they make.
The nearest shoreline is about five kilometres away at its closest. The shoreline management plan for that stretch says hold the line for the next 20 years, the next 50 and the next 100. That is a stated intention to keep the coast where it is. It depends on money that has not been committed, and it tells you nothing about what defences stand there today. River flooding in town is a separate issue that the plan doesn't touch.
The nearest tide gauge in the national record is Liverpool George's and Princes Piers. It measured sea level rising about 1.4 millimetres a year between 1858 and 1983. That is the rate at a Mersey pier during a record that ended over forty years ago, so its bearing on Mitcheldean is mostly a matter of geography and distance.
No historic flooding is recorded in Mitcheldean's postcodes. That is reassuring, and it fits the absence of any Zone 2 margin. All it really shows is that no flood made it into the records, so it cannot outweigh a map that puts four in ten postcodes in the high-risk zone.
Flood is a serious problem in Mitcheldean, and it is not spread evenly. The high-risk ground has a clear edge, and which side of it you buy on decides most of the risk.