How large should a portable tank's capacity be compared to the water tank on the supplying apparatus?

A portable tank's capacity should generally be at least 500 gallons larger than the water tank on the supplying apparatus. This guideline ensures that the portable tank can effectively support larger firefighting operations by providing an adequate supply of water. The additional capacity allows for greater flexibility and operational efficiency, especially in scenarios where quick water supply is crucial, such as in rural firefighting operations or during extended incidents where water sources may be limited.

Having a larger portable tank not only aids in maintaining a continuous flow of water but also helps to reduce the frequency of the tank needing to be refilled, allowing for uninterrupted firefighting efforts. Such a capacity standard is based on practical experience and operational needs, emphasizing the importance of readiness and resource availability in emergency situations.