Typically, fire departments are required to continue efforts to extinguish no matter what. At a certain point, their efforts do just turn to controlling the fire to limit or eliminate spread. It all depends on risk of fire spread, threats to life safety, and ultimately property protection.At what point do you just let it burn?
The minimum pump capacity according to the standards is 1000 GPM, a large majority of new pumpers purchased these days are actually about 1500 GPM. All the new pumpers being purchased by FDNY are 2000 GPM and they just purchased 1 5500 GPM "super pumper". 5500 GPM is the largest I've seen in a truck and even then finding a water supply capable of providing that much water is a challenge in many areas.26,000 gallons per minute
So how much water does a modern pumper put out? I guess it also depends on the supply at the hydrant.