Direct measurement of evaporation from a standardised water pan (US Class A pan or European equivalents). Higher than reference evapotranspiration (ET0) by 1.0–1.4×.
Pan evaporation is the directly measured evaporation from a standardised water pan — the US Class A pan or European equivalents. Pan rates exceed reference evapotranspiration (ET0) by approximately 1.0–1.4× depending on climate and exposure. For industrial reservoir water management, pan evaporation is a better predictor of open-water loss than ET0 alone. Floating covers reduce the effective pan rate at the covered area by 90–97%.
Also known as: pan ET