The water gets captured in concrete gutters (canetta - shown in later photos) or using a french chanel (below) - a trench with a perforated pipe that is then covered with stones
These help direct the water to catchbasins (these act a gathering points and slow the flow - large concrete box that the water falls into before it can flow out again) - sometimes through underground pipes.
All to get the water away from the house or the road and to where it is supposed to be - the river in the ravine behind the house.
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