Snodland's flood risk is modest on today's river map and harder to ignore once you look further ahead. Very few postcodes sit in the high-risk river zone. About a quarter do once climate change is factored in. Around one in six has flooded before. Today's map is the version that flatters the town.
In the Environment Agency's river-and-sea flood zones, about 1% of Snodland's postcodes fall in Zone 3, the highest-probability band, and less than 1% fall in Zone 2, the medium-probability fringe beyond it. The two bands don't overlap, so the smaller Zone 2 figure is not a mistake. On this measure alone, the Medway looks like a well-behaved neighbour. Buyers who stop reading here are the ones who get surprised later.
Surface water is where the history lives. About 16% of postcodes lie within areas with a recorded historic flood, and the Environment Agency holds 46 recorded flood events for the area, the most recent listed dating from November 1960 and caused by local drainage and surface water. About 20% of postcodes fall within the Lower Medway Internal Drainage Board's district, which exists because the low ground needs managing. A drainage board does not appear on the listing photos, but it appears on the bill.
Looking forward, about 24% of postcodes fall inside the flood zone once the Environment Agency's climate-change allowance is applied. That is a planning projection, not a prediction for any single street. It is also the figure that lenders and insurers will be looking at when your house is next for sale.
For insurance, the practical point is that the address matters more than the town. Two houses a few streets apart can get very different quotes, and a clean river zone does not cancel out a surface-water record. Get an indicative quote on the exact address before you commit money to surveys and solicitors.
On the postcode-level indicators, which fold surface water in alongside rivers and sea, about 8% of postcodes rate high on at least one measure, about 12% medium and about 28% low. These bands overlap with the zone figures above and use a different method, so they should never be added together. They are the wider net, and they catch more of the town.
The Environment Agency's rivers-and-sea mapping counts 230 properties in the 15 postcodes that carry any risk at all. Of those, 25 are at high risk, one at medium, five at low and 47 at very low. Six of the high-risk properties are homes. Postcodes with no risk don't appear in this count, so it covers the exposed corner of Snodland, not the whole town.
In the modelled high-risk flood extent, about 1% of postcodes are undefended and none are defended. In other words, where the high-risk water reaches, the model shows nothing standing in its way. Even where a defence does appear in the model, that means a defence is present, not that the property behind it is safe.
The tidal Medway is closer than most buyers assume. About 30% of postcodes lie within 500 metres of the mapped coastline, the nearest just 12 metres from it, and the median distance is about 710 metres. The 500-metre line is a threshold in the data, not a verdict on any one address. The tidal reed bed at Burham Marsh sits across the river.
The shoreline management plan sets managed realignment as the main policy over the next 20, 50 and 100 years. That means allowing the shoreline to move in a controlled way rather than holding it where it is. A policy is a stated intention, not a guarantee, and it is not a defence already built.
The nearest tide gauge, at Dover, recorded sea level rising by about 2.2 millimetres a year between 1961 and 2010. That is a measured historic rate, not a forecast.
Flood risk is Snodland's weak spot: small on the current river map, larger in the surface-water record and in the climate projection, with nothing modelled holding the high-risk water back. Check the address, not the town average, before you buy.