What would be the feet of head for the pumping curve?

The feet of head for a pumping curve indicates the height to which a pump can raise water. It is a critical parameter in understanding a pump's performance, reflecting the hydraulic energy added to the water by the pump. When evaluating this specific question, the given choice of 415 feet is the most likely value that corresponds to the optimal performance point on the pump's curve.

A pumping curve is typically a graph that illustrates the relationship between the flow rate of the pump and the head pressure it generates. At higher flow rates, the head produced by the pump generally decreases due to factors such as friction losses and pump efficiency. Therefore, the correct answer indicates a scenario where the pump operates at an efficient head under specified conditions, allowing operators to gauge the pump's suitability for various applications in real-world scenarios.

In this context, the other values would not reflect the ideal operating conditions for the pump in question. Lower head values such as 250, 365, or 390 feet suggest less hydraulic energy output and may not meet the pumping requirements for more demanding systems, making them less relevant for scenarios requiring higher elevation or pressure. Hence, 415 feet is the most appropriate choice for maximum performance on the pumping curve.