Analysis of seasonal variation in the hydrological behaviour of a field combining surface and tile drainage

Agricultural drainage increases hydrological connectivity between fields and receiving environments. Tile drains ditches are the main types studied at field scale. They can be associated with temporary surface to improve removal of water. Combining tile is likely modify runoff soil water dynamics. The behaviour tile-drained has been event scale, but few studies have conducted over a full year, no quantified volumes in combining drainage. So quantifications partition drainage, needed understand drains. Moreover, showed macropores contribute drain preferential flow matrix still unclear. It needs study depending on several parameters as type, content or agricultural practice for better understanding. In this study, high temporal resolution quantification was two years functioning using balance drained field. Soil pathways were under dry saturated conditions, tracing by measuring stable isotope (18O 2H) concentrations rainwater, water, runoff. Runoff that respectively transferred 44% 20% annual effective rainfall. However, that, 65% infiltrating not captured At season variation contribution hydric state. Under rainwater directly drains, through macropores. On soil, pre-event provided most flowing out from drain, rainfall up 25% trancing allowed propose conceptual model