3.2.1 Surface and subsurface runoff
From the rainfall, subsurface and surface runoff times series, several parameters characterizing the runoff as rainfall response are determined (Table 2). During the intense drainage period, the surface runoff always starts before the subsurface runoff. The times lag between the beginning of the rising limb of the surface runoff and the subsurface runoff ranges from 0.22 hours to 29.08 hours. The peak flow was superior to 2.01 L s-1 for 50% of the surface runoff events, whereas the maximum peak flow recorded for the subsurface runoff is 1.7 L s‑1 (Table 2). During the intense drainage period, the surface runoffs are characterised by shorter reaction times (2.50 h), shorter durations (13.48 h) and higher flow (5.22 L s-1) compared to subsurface runoffs (6.72, 27.43 and 0.81 L s-1, respectively).