dataset · England
Environment Agency Potential Evapotranspiration Dataset
Potential Evapotranspiration (PET) is the amount of evaporation which would occur if there was an unlimited supply of water. This dataset represents Potential Evapotranspiration for well watered grass and is available either with an Interception element (PETI) or without one (PET). The dataset has been calculated from homogenised climate station data, gridded to a 1km grid. The dataset starts in 1961, is available on a water day (09:00 to 09:00 on the following day) timestep and is updated frequ
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Licence: ["There are no public access constraints to this data. Use of this data is subject to the licence identified.", "There are no public access constraints to this data. Use of this data is subject to the
Evidence quality: 52.9
Listed in data.gov.uk public catalogue API on 2026-10-16; relevance/value screened (haiku).
Metadata checked: 2026-10-14T13:20:00.000Z
What's in it
- Data offered docs-verified
- Potential Evapotranspiration (PET) for well watered grass · Potential Evapotranspiration with interception element (PETI)
- Coverage docs-verified
- Bounding box latitude 49.643° to 56.558°, longitude -6.697° to 2.572° (EPSG:27700 spatial reference); catalogue region England · 1961 onwards
- Resolution docs-verified
- 1 km grid (spatial); water-day timestep 09:00 to 09:00 the following day (temporal)
- Update frequency docs-verified
- Monthly
- Formats docs-verified
- ZIP · PDF (documentation)
- Access docs-verified
- Free, open download under the Open Government Licence v3.0; no public access constraints; no API or auth listed
Useful for
- Use cases llm-inferred
- Catchment water balance inputs for flood risk assessment and hydrological modelling · Drought and abstraction licensing baseline for evaporation demand · Groundwater recharge and SuDS water balance estimates using gridded PET
- Audience llm-inferred
- hydrologists · flood consultants · drainage engineers · water resources consultants · ecologists
Limitations
- Constraints llm-inferred
- Potential rather than actual evapotranspiration: assumes well watered grass, not site-specific land cover or soil moisture · Gridded at 1 km from homogenised climate station data, so modelled rather than site-measured · Interception (PETI) variant is a separate download from PET · Distributed as annual ZIP archives; no API or MCP tool access in catalogue metadata · Attribution to Environment Agency required
Evidence
- https://environment.data.gov.uk/api/file/download?fileDataSetId=828edf4f-8035-4322-8354-c5b661793f79&fileName=PETI_1961-1965.zip
- https://www.data.gov.uk/dataset/7b58506c-620d-433c-afce-d5d93ef7e01e/environment-agency-potential-evapotranspiration-dataset
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.