The design of fire reservoir in a garage involves ensuring that there is sufficient water supply for firefighting purposes. This typically includes the size, location, and accessibility of the reservoir. The design must comply with local building codes and fire safety regulations, and may also involve considerations such as the type of fire protection system, water quality, and emergency access. Key aspects include determining the required water volume based on the size of the garage and the types of vehicles stored, ensuring the reservoir is adequately protected from freezing, and that it is designed to prevent contamination and to facilitate easy refilling.