Any BMP that collects sediment must be cleaned before it reaches _____ of its capacity.

The appropriate choice emphasizes the importance of maintaining sediment control structures to ensure their effectiveness. BMPs (Best Management Practices) designed to collect sediment, such as silt fences, sediment basins, or traps, need regular maintenance to function properly. If sediment accumulation reaches a certain level, the BMP can become less effective at trapping additional particles, which may lead to sedimentation and erosion issues.

Cleaning the BMP before it reaches 50% of its capacity strikes a balance between allowing the structure to operate efficiently and minimizing the risk of overflow or failure. When sediment levels exceed this threshold, the likelihood of re-suspension increases, making the management of sediment more challenging and potentially resulting in sediment runoff into nearby waters. This proactive approach helps ensure that the BMP remains effective over time, protecting water quality and reducing environmental impacts.