Sediment Accumulation Survey

Introduction to Sediment Accumulation Survey
Stormwater ponds play a vital role in urban environments. They are designed to capture rainwater and runoff from impervious surfaces, which helps to mitigate flooding. Over time, these ponds collect sediment, which diminishes their ability to retain water and prevent flood events. For those responsible for managing Stormwater Ponds, it is crucial to be prepared for emergencies and to allocate budget and resources for dredging when necessary.

Sediment Quantification
To ensure that Stormwater Retention Ponds function properly, consistent monitoring and appropriate actions are required. One method to evaluate the capacity of Stormwater Ponds and ascertain the need for dredging is by conducting a Sediment Accumulation Survey. If you are interested in performing a basic sediment (sludge) survey, you can find instructions on how to do that here. Detailed sediment accumulation surveys are essential for determining dredging needs; they provide information on hydraulic capacity, sediment volume, dredgeable volume, the dry weight of sediment to be removed, and the percentage of total cell volume that is filled with sediment. This information, along with 3D sediment maps, will guide you in deciding whether dredging is necessary.