It is advised to make use of water storage tanks where your need for water is most likely higher than the borehole yield and, as well as for drought protection.
Additionally, they turn out to be incredibly useful for commercial usage or farmers that depend greatly on water and have no access to a mains supply which means that if their submersible pump malfunction; they could be without water instantly, having huge implications for the business.
A water storage tank is used to hold water in reserve suggesting that a farmer or company or household could continue to use their water even if the pump is out of action. This will afford them time to discover the problem and get it fixed.
Along with buying a company time if they come across difficulties, a tank also minimises stress on the borehole by not having it functioning continuously, giving the user more control over their personal water supply