Rainwater harvesting essentially means collecting rainwater on the roofs of building and storing it underground for later use. Not only does this recharging arrest groundwater depletion, it also raises the declining water table and can help augment water supply.
it helped bring over different culturally and different type of spice such as pepper, ginger ,nutmeg it was developed by indians and arab merchants. by the suez canal opening it adapted to steam bouts and new communication device...
hopfuly this helps some ^v^
