What is the purpose of the shallow pit under a skimmer?

The purpose of the shallow pit under a skimmer is to accumulate sediment. A skimmer is a device used in sediment control systems, particularly in sediment basins or detention ponds. It operates by allowing water to flow over the top while permitting sediment-laden water to enter the skimmer. The sediment settles into the shallow pit, where it can be managed effectively.

By accumulating sediment in the pit, the skimmer facilitates the removal of this sediment from the water column before it can be discharged. This function is crucial in minimizing the amount of sediment that potentially leaves the site, thus contributing to improved water quality in nearby water bodies. Additionally, the accumulation of sediment helps maintain the efficiency of the skimmer, ensuring that it continues to operate effectively as sediment levels fluctuate over time.