This research reviews the conception of (HarvestingWater) in a modern scientific point of view ; dependingon Arabic and foreign scientific references. This researchpresents the components of harvesting water systemsrelating them scientifically and thoroughly with verses of theGlorious Qur'an , particularly verses from Al-Naml surah: "Ishe (not best) who made the earth astable ground and placedwithin it rivers and mad for it firmly set mountains and placedbetween the two seas a barrier? (No), but most of them do notknow. "