This approach has led to a tool that supports dredging engineers when designing an optimal reclamation area and sedimentation basin(s). Only a limited amount of literature on sedimentation and erosion processes was utilised to maintain its suitability for a practical design application. Field measurements have driven the development of the design tool. The tool was initially built for a specific project and has been developed, fine-tuned and validated ever since. When the discharge rate and mixture properties are provided or estimated, RWQ can predict the quality of the return water.

The width, length, depth of fill/and or basin can be optimised to improve sedimentation and return water quality. The model provides the concentration and particle sizes still suspended in the return water. The RWQ model generates a particle size distribution and follows the settlement of each particle size along the length of the sand fill (reclamation area) and/or sedimentation (settling) basin.

Depending on the type of dredged material and the dimensions of the reclamation area (and settling basin), the return water might contain suspended particles when returning to the surface water.Ī question that often comes up is: Will our reclamation area have enough capacity to hold the amount of dredged material, considering factors such as bulking and rock or particle degradation? Furthermore, are settling basin(s) needed and if yes, how large do they need to be in order to let the fine particles settle and to return clear water or water not exceeding the environmental water quality requirements? Port Brisbane reclamation area and sedimentation basin During this process, the material settles and the excess water or return water is drained via one or more outlet into the receiving water body.

When dredged material is pumped into a reclamation area, the sediment and water mixture flows over the reclamation area and possibly through one or more settling basins. the amount of sediment contained in the water flowing out of a given reclamation area. The Return Water Quality (RWQ) Tool from in2Dredging (i2D) predicts the quality of return water, i.e.

Define dredged material