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10 rivers meet the Anzali Wetland; each of them releases different concentrations of contaminants and sediment into the wetland and consequently led to remarkable water quality loss. Among these 10 rivers, Chomesqal and Siahdarvishan Rivers discharge a large amount of contaminated sediment. Asarab Consulting Engineers Co. conducted a comprehensive study, to estimate the sediment volume, its concentration and deposition rate from the rivers. According to the result of this preliminary study, volume and dimension of sediment trap was calculated for trapping inlet sediment. Then the water quality in the wetland would be enhanced considerably and also the habitat of wading birds will be rehabilitated and conserved properly. Besides the above mentioned advantages of this program, it will prevent wetland to be dried.
This project included two sections, the main section was sediment trap and basin designing and the other one was Environmental Impact Assessment of sediment trap and basin construction, in order to meet the main objectives of the project, the following services have been accomplished:
Environmental Impact Study of sediment trap construction in construction and operational phase:
The sediment trap is able to detain 350,000 M3sediment of the two rivers during 2 years.