The performance of a diverting headwork might be seen in several ways. 

Flow Measurement: Install flow meters or gauges to find the volume and rate of water diverted.

Water-Level Gauges: Use them to track headwater and tailwater levels in order to assess hydraulic performance.

Visual Assessments: Regularly inspect the structural condition, looking for signs of wear, corrosion, or silt accumulation.

Analyzing data: Analyze acquired data to determine efficacy, identify anomalies, and optimize procedures.

Maintenance Records: Review records to ensure that routine maintenance is performed and to address any enduring issues.

These methods provide a comprehensive picture of headwork performance, ensuring efficient operation and timely repair.