True or false: For accurate calculations of available water, the tank fill valve should be open.

To determine the accuracy of calculations regarding available water in a tank, it is essential that the tank fill valve be closed. When the fill valve is open, water from the supply source is entering the tank, which may misrepresent the current volume of water available for use.

If the fill valve is open, it could lead to an inflated measurement of how much water is currently in the tank, since the calculations would be accounting for both the existing water and the incoming water. This could result in decisions being made based on incorrect data, ultimately affecting the effectiveness of operations and safety during pumping.

In contrast, having the fill valve closed ensures that any calculations reflect only the water currently present in the tank, providing an accurate basis for assessing available resources and making operational decisions. Thus, for the purpose of achieving reliable calculations, the fill valve should indeed be closed when assessing available water.