River dredging is a form of river restoration and river maintenance. Over time, sand, silt and debris (branches, logs, waste) flow downstream. This is a natural phenomenon, which happens due to weathering, erosion and rivers carrying sediments. If not maintained, the materials accumulate and create a blockage. Consequently, this restricts natural river flow and makes the waters very shallow. As a result, rivers become inaccessible to larger ships. Additionally, during heavy rain season, restricted river flow can cause flooding. Flooding may result in major property damage, have negative impact on local businesses, and even be life threatening.
River dredging is therefore necessary to maintain natural river flow and appropriate water depth to minimize risk of potential disasters.