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Modelling Study to Support EIA & SIA of KJDRP |
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Location |
South west Region of Bangladesh |
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Type of Project |
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Period of Study |
1998 |
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Client |
EGIS |
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Project Map |
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Description During the 1960s’, large areas of land in the South west region of Bangladesh were brought under cultivation through the provision of flood protection and drainage facilities. Since then the tidal rivers started silting up and in the Khulna Jessore region, near the limit of the tidal intrusion, the siltation has been severe. This resulted in continuous deterioration of the drainage capacity and consequent loss of agricultural production and livelihood in the region. Several studies to investigate the drainage problems and probable remedies were carried out in late 80s’and early 90s’. One of the recommendation of one study financed by ADB was to set up a mathematical model to cover the entire Khulna-Jessore Drainage Rehabilitation Project (KJDRP) area. Using this model, it would be easier to compare alternative design and operating strategies and evaluate their effectiveness in reducing the drainage congestion. The Project (KJDRP) is located in the south-west region of Bangladesh having an area of 1166 km2. The river morphology of the area is characterised by the active deposition of sediments and silts carried into the area with high tide. This process of sedimentation causes drainage congestion of the project area. The main objective of the project was to increase agricultural production by improving the drainage options such as Kedaria tidal basin (KTB), Madhukhali regulator, Kharina regulator and Shibnagar regulator options, as outlined in this paper. At a later stage, the model results were used for EIA and SIA of the project area. It appears that under the Madhukhali regulator option, considerable drainage improvement can be achieved compared to other options, but Drainage Plan involving such large regulator show considerable decrease of tidal prism in the downstream rivers. However, the tidal river basin option (KTB) does not show any change in tidal prism in the drainage channels and drainage improvement is improved when compared to present condition. Further investigation has been recommended based on the latter option (KTB). The final recommendation of study suggested to adopt the tidal river management (TRM) option, based on KTB option studied by SWMC. Based on various option studies, ADB carried out a technical evaluation of the TRM option and emphasised that the TRM requires further monitoring, evaluation and decision making with a close interaction of various stake holders. The main objective of the monitoring TRM is to gain more insight into the system and to develop and improve models to support management decision.
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