In each field visit, manual reads of the limnimetric scale located at the weir were taken and were used to calibrate the instrument flow recordings. Discharge (Di, in L) was calculated for successive small steps tracking the variation of the hydrographs (Fig. 2).
Di = qi*(ti+1-ti) + [(qi+1-q i)*(ti+1-ti)/2],
being qi the instantaneous stream flow (in L/s at TM9 and in m3/s at TM0) and qi+1 , the stream flow for the next reading.