Understanding Drainage Dynamics and Irrigation Management in a Semi-Arid Mediterranean Basin

Irrigation is one of the main users water worldwide and its overuse may affect natural regimes systems. To avoid this, drainage irrigation management needs to be improved. This study aims determine amount lost in a semi-arid Mediterranean irrigated area. Water use, rainfall were monitored for 12 months (2019–2020) 425 ha sub-basin Algerri-Balaguer district (8000 ha, NE Spain). In addition, requirements estimated using single-crop FAO-56 method two-source energy balance model (TSEB) was used estimate actual evapotranspiration sub-basin. as 18% total that entered perimeter rainfall, which are almost five time higher than theoretical leaching. Out water, 57% 43% rainwater. The average 614 mm efficiency at 80.2% averaged 1144 mm. available margin improvement between 19.3% present ratio 3.8% with leaching requirement model.