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Table 2 summarizes the main characteristics of the events studied. The mean values of the variables related to rainfall events that promoted runoff (P, EI30, E) had higher means in 2011 and 2013 than during 2012. However, P5d, R and associated variables (Qp, Qms and RC) and SC showed higher mean values in 2012 than during 2011 and 2013. This analysis suggests that during the dryer years, rainfalls of higher magnitude and erosivity were needed to generate hydrological and sedimentological response in the watershed.

Table 2

Mean, maximum and minimum values of the variables studied during 2011–2013 in the watershed of the Videla stream

 No. of eventsParameterPPDurEI30EI30P5dRQpQmsRCSLRSC
  Mean 47.6 15.3 276.0 9.7 24.9 20.4 9.3 1.4 0.3 17.9 0.1 1.0 
2012 13 Maximum 136.4 42.0 1,030.3 28.3 57.2 77.8 42.6 4.6 1.2 56.9 0.2 4.1 
  Minimum 17.8 3.0 41.6 3.9 8.4 0.0 0.4 0.1 0.0 1.9 0.1 0.4 
  Mean 52.2 14.8 320.1 10.6 24.7 5.3 5.3 0.9 0.2 7.7 0.1 0.5 
2011–2013 Maximum 106.6 31.0 1,144.5 22.7 50.4 18.6 26.0 3.2 0.9 24.4 0.3 0.9 
  Minimum 32.6 4.5 43.1 6.3 6.8 0.2 0.4 0.2 0.0 1.0 0.1 0.4 
 No. of eventsParameterPPDurEI30EI30P5dRQpQmsRCSLRSC
  Mean 47.6 15.3 276.0 9.7 24.9 20.4 9.3 1.4 0.3 17.9 0.1 1.0 
2012 13 Maximum 136.4 42.0 1,030.3 28.3 57.2 77.8 42.6 4.6 1.2 56.9 0.2 4.1 
  Minimum 17.8 3.0 41.6 3.9 8.4 0.0 0.4 0.1 0.0 1.9 0.1 0.4 
  Mean 52.2 14.8 320.1 10.6 24.7 5.3 5.3 0.9 0.2 7.7 0.1 0.5 
2011–2013 Maximum 106.6 31.0 1,144.5 22.7 50.4 18.6 26.0 3.2 0.9 24.4 0.3 0.9 
  Minimum 32.6 4.5 43.1 6.3 6.8 0.2 0.4 0.2 0.0 1.0 0.1 0.4 

P, precipitation that promoted runoff (mm); PDur, precipitation duration (h); EI30, erosivity index (MJ mm (ha h)−1); E, total rainfall kinetic energy (MJ ha−1); I30, maximum intensity in 30 minutes (mm h−1); P5d, accumulated precipitation of 5 days previous to the events (mm); R, surface runoff sheet (mm); Qp, peak flow (m3 s−1); Qms, mean surface flow (m3 s−1); RC, runoff coefficient (%); SLR, soil loss ratio; SC, composite sampling concentration of suspended solids (g L−1).

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