Often however the main concern with WID is a lasting detrimental effect on dissolved oxygen concentrations within the water. Often the types of water bodies, where WID is suitable, experience naturally elevated background levels of turbidity, due to the high energy river flow or tidal regime hydraulically agitating the present sediments. Environmental monitoring is usually required by the authorities to assess and monitor the effects of WID on the local environment. Potential water bodies where WID is considered should be firstly be subject to an environmental assessment to ascertain the likely outcome of the movement of the sediments and potential areas of re-deposition. Unsuitable materials are disposed of to landfill or at an appropriate off-shore, licenced disposal site in a low impact environment. There is a complex balance of appropriate use/ecological impact/commercial viability and sustainability to be assessed in determining an end use for sediments. The re-use of sediments in these scenarios is subject to considerable testing, analysis and background studies to determine the suitability or otherwise of the materials. Replenishing mud flats and other biodiverse areas can also be valuable in preserving such areas by increasing ecological value and providing protection from extensive erosional processes. Artificial beach replenishment may be undertaken to maintain prominent areas of tourism and reduce flood risk in an area as the water flow energy is dissipated as it moves over the sand particles. This may be to extend or enhance an area of land for commercial purposes i.e.: a neighbouring area of land in a harbour. When dredging a particular region to maintain navigation it is often valuable to use the dredged material for land reclamation or replenishment purposes.
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