where RH is amount in m3 of rain water harvested and stored in a tank, Ptot the total annual precipitation in mm, Aroof
the roof area in m2 and H
eff the harvesting efficiency of the system set by default to 60%. Since the last two
parameters are set to a constant value, RH is modulated only by precipitation and its variability among the RGs is
linked to the spatial distribution of precipitation across the study area.