Technical and Operational Feasibility Considerations Transport Draft of dredge and Hydrodynamics of site Operational risks manoeuvrability (coastal conditions including currents and waves, storm surge etc) Sand/silt/clay can often be Dredges/barges must be with High energy conditions Turbidity plumes, spills during LAND RECLAMATION pumped from dredging site to suitable draft and increase risks of pipe rupture, pumping of spoil, failure of (sub-tidal creation of reclamation site. The practical manoeuvrability to be able to vessel grounding, and spills. pipelines, vessel land) limit for pumping spoil is 7-10 get close enough to Land reclamation site must not grounding/navigational km. Greater distances require reclamation site to pump or be in an area prone to coastal hazards, failure of bund walls booster pumps. Pumping of offload the material. erosion or storm surge. from extreme weather events. coarser material including clay Causeway/jetty construction lumps may not be feasible. If may be required to offload if pumping is not an option, pumping not feasible. multiple handling (loading/unloading of barges, trucking) may be required. Sand/silt/clay can often be Dredges/barges must be with Coastal conditions can affect, Turbidity plumes, spills and CONSTRUCTION FILL pumped from dredging site to suitable draft and delay and pose risk to failure of drying pond walls. (supra-tidal) reclamation site. The practical manoeuvrability to be able to unloading and/or pumping Groundwater contamination at limit for pumping spoil is 7-10 get close enough to operations of material to shore capping site from chemical km. Greater distances require reclamation site to pump or and increase the risk of leachate. Transportation and booster pumps. Pumping of offload the material. facility or storage infrastructure
Technical and Operational Feasibility Considerations Transport Draft of dredge and manoeuvrability Hydrodynamics of site (coastal conditions including currents and waves, storm surge etc) Operational risks LAND RECLAMATION (sub-tidal creation of land) Sand/silt/clay can often be pumped from dredging site to reclamation site. The practical limit for pumping spoil is 7-10 km. Greater distances require booster pumps. Pumping of coarser material including clay lumps may not be feasible. If pumping is not an option, multiple handling (loading/unloading of barges, trucking) may be required. Dredges/barges must be with suitable draft and manoeuvrability to be able to get close enough to reclamation site to pump or offload the material. Causeway/jetty construction may be required to offload if pumping not feasible. High energy conditions increase risks of pipe rupture, vessel grounding, and spills. Land reclamation site must not be in an area prone to coastal erosion or storm surge. Turbidity plumes, spills during pumping of spoil, failure of pipelines, vessel grounding/navigational hazards, failure of bund walls from extreme weather events. CONSTRUCTION FILL (supra-tidal) Sand/silt/clay can often be pumped from dredging site to reclamation site. The practical limit for pumping spoil is 7-10 km. Greater distances require booster pumps. Pumping of Dredges/barges must be with suitable draft and manoeuvrability to be able to get close enough to reclamation site to pump or offload the material. Coastal conditions can affect, delay and pose risk to unloading and/or pumping operations of material to shore and increase the risk of Turbidity plumes, spills and failure of drying pond walls. Groundwater contamination at capping site from chemical leachate. Transportation and facility or storage infrastructure
gbr-dredge-material-management-appendixa.docx