SY15 6AB - Flood, Heat, Air & Subsidence Risk - Trefaldwyn

Powys, Trefaldwyn

Climate risk summary for SY15 6AB

SY15 6AB in Trefaldwyn has a High flood risk. Heat risk is Lower, with a median (50th percentile) of 12 days above 25°C per year, averaged over the 2021-2040 period under the RCP8.5 high emissions scenario (Met Office UKCP18). Air quality is Low at PM2.5 4.5 μg/m³, within the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Lake Deposits geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: Plan with flood risk in mind for this area.
• Heat: Projected 12 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5, 12 km grid - postcodes within the same grid cell share this value).
• Air quality: PM2.5 4.5 µg/m³ - within the WHO annual guideline of 5 µg/m³ (Defra UK-AIR PCM model, council-level average - every postcode in this council shows this value).
• Ground: BGS data: Lake Deposits geology. Shrink-swell risk classed as improbable (British Geological Survey).

What is the flood risk in SY15 6AB?

Flood risk at SY15 6AB is rated High, based on Natural Resources Wales flood mapping.

Natural Resources Wales flood zone data places SY15 6AB in the high flood risk band. The band reflects the highest flood risk within the postcode; some properties within this postcode may face little or no direct flood risk. A formal flood risk search and review of buildings insurance availability is recommended before any property transaction in this area.

How is the air quality in SY15 6AB?

Air quality at SY15 6AB is rated Low, based on Defra UK-AIR annual mean PM2.5 data. Fine particulate matter (PM2.5) comes primarily from road traffic, industry, and domestic burning. Long-term exposure above the WHO guideline of 5 µg/m³ is linked to respiratory and cardiovascular health risks. Buyers and renters in higher air quality risk areas may wish to consider whether the property is near busy roads or industrial sources.

Is subsidence a risk at SY15 6AB?

British Geological Survey data classes the underlying soil at SY15 6AB as Lake Deposits, with shrink-swell hazard rated improbable (subsidence risk band: Low). A structural survey is the reliable way to assess ground conditions for a specific property.

Where does this data come from?

This LocalRisk report for SY15 6AB draws on four official UK open data sources: Natural Resources Wales flood mapping, Met Office UKCP18 climate projections, Defra UK-AIR PM2.5 monitoring, and British Geological Survey GeoClimate subsidence mapping. Risk ratings are a screening tool, complementing - not replacing - the searches and surveys ordered as part of a property transaction. Data covers Powys and is updated as new official datasets are published.

About the Powys area

Powys has a predominantly rural upland setting with extensive river catchments, rolling hills and sparse settlement and experiences cool, wet winters and mild summers, influenced by elevation and Atlantic weather systems.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for SY15 6AA is at localrisk.co.uk/postcode/SY156AA, and you can compare SY15 6AB side by side with any UK postcode at localrisk.co.uk/compare.