It is an excavated water storage structure that is square, rectangular or round, used to impound and retain surface runoff from uncultivated grounds, roads or seasonal rivers.
A lot of water is lost in arid and semi-arid lands (ASAL) as surface runoff. Harvesting of this runoff and storage of the same into reservoirs such as water pans makes it available for use when required.
These pans when completely full will hold enough water for the people in remote areas and will benefit them till the next rains.
A borehole is simply a deep narrow well usually driven by an electric/manual pump that taps into the underground stores of water held in permeable rock known as aquifers.
A water borehole can provide a constant supply of water for domestic outdoor uses.