What happens to flow as pressure head decreases?

As pressure head decreases, the flow typically decreases as well. The fundamental principle at work here is based on the relationship between pressure and flow rate in a fluid system. When pressure head diminishes, there is less force being applied to push the water through the distribution system, which results in a reduced flow rate.

The flow rate in a piping system is significantly influenced by the pressure available to move the fluid. As pressure decreases, the energy driving the fluid diminishes, which leads to a lower velocity and overall reduced flow at the point of discharge. Therefore, when considering the dynamics of water distribution systems, recognizing that lower pressure equates to lower flow is crucial for effective system management and operation.

Understanding this principle helps in the design and operation of water distribution systems, ensuring that adequate pressures are maintained to provide sufficient flow rates to meet demand.