A ground service reservoir (GSR) is a type of water storage facility typically located underground. It is used to store potable water for distribution to consumers, especially during peak demand periods or in emergency situations. GSRs are often constructed using reinforced concrete or steel, providing a durable and secure storage solution. These reservoirs are designed to maintain water quality by protecting against contamination and minimizing evaporation. They are equipped with inlet and outlet pipes, as well as control valves and monitoring systems to regulate water levels and ensure efficient distribution. GSRs play a vital role in water supply infrastructure, contributing to reliable and uninterrupted water service delivery to communities.