What is the primary function of sediment traps in drainage systems?

The primary function of sediment traps in drainage systems is to capture solids from stormwater. Sediment traps are designed to slow down the flow of water, allowing particles such as soil, debris, and pollutants carried by stormwater to settle out of the water column. This not only helps in reducing sediment pollution downstream but also protects the integrity of the drainage system itself by preventing build-up and blockages that could disrupt flow. By effectively removing sediments, sediment traps contribute to cleaner water entering waterways, which is crucial for maintaining environmental health and reducing the adverse impacts of erosion and sedimentation.

Other options may suggest different functionalities but do not accurately represent the specific role of sediment traps within a drainage system. For instance, storing excess water during drought relates more to water conservation measures, while enhancing the flow rate focuses on hydraulic efficiency and does not directly tie to sediment management. Distributing water evenly across agricultural land pertains to irrigation systems rather than the function of sediment traps in managing stormwater runoff.