Which element is not typically considered in evaluating the performance of screening systems?

In evaluating the performance of screening systems, the primary focus is often on factors directly related to their operational effectiveness and efficiency. Removal efficiency refers to how effectively a screening system can separate unwanted debris or solids from the water, which is crucial for ensuring water quality. Maintenance frequency is also significant, as it relates to how often the system requires servicing or cleaning to maintain optimal performance. The volume of material removed provides insight into the capacity and efficiency of the system in handling the incoming flow and the effectiveness of the screening process.

Installation cost, while a consideration in the overall project budgeting and decision-making process, does not reflect the ongoing operational performance of the screening system itself. Instead, installation cost is more related to the initial investment and not a metric by which we assess how well the system performs its function once it is in operation. Focusing on operational metrics such as removal efficiency, maintenance frequency, and volume of material provides a clearer picture of the system's effectiveness in practical scenarios.