Sediment measurement involves sampling the water-sediment mixture to determine the mean suspended sediment concentration, particle size distribution, specific gravity, temperature of the water sediment mixture, and other physical and chemical properties of the solids. The location of the sediment, its particle size distribution and compaction, and the use of the resulting data define the type of sampler chosen. In Dutch waters like rivers, channels, lakes and harbours the sediment often consists of silty sludge and sometimes clay. Sediment transport is a continuous process but after storms with high water levels most sediment is transported. Smaller waterways like ditches and ponds have a natural growth of the amount of sediment during the seasons. The rainfall runoff is causing most of the sediment transport and accumulation. Sediment sampling in smaller waters is often done by using a hand corer. In the rivers we often use the Van Veen grab sampler or the piston corer. For larger depths the vibrocore is used. All three devices are available at Aquifer Consultancy.
Samples are being analyzed by a certified laboratory and the results are reported. Aquifer Consultancy can take care of all these activities.
Sediment sampling in the Netherlands is performed in accordance with NEN 5720, strategy for exploratory survey, investigation of the environmental quality of sediments drawn up by The Netherlands Standardization Institute. The field work is carried out under the BRL SIKB 2000, protocol 2003, a protocol concerning the quality of the sampling and the knowledge of the sampler.