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Case Studies for Sustainable Drainage Improvement Under Tidal River Management in Khulna Jessore Area

Sharif Uzzaman CHOUDHURY
Institute of Water Modelling, Bangladesh

Zahirul Haque KHAN
Institute of Water Modelling, Bangladesh

Abstract/ Executive Summary:

Large areas of land in the southwest region of the country were poldered in the 1960s to provide flood protection and drainage facilities to bring the areas under cultivation. Since that period, gradual siltation occurred in the tidal channels and the conveyance capacity of the tidal rivers in the region deteriorated over the years. Out of several studies that were carried out to alleviate the situation, one study recommended the concept of Tidal River Management (TRM), the core objective of which was to increase the conveyance of the tidal river system through storage of water in a depression area (locally known as beel) working as a tidal basin during high tide and release of the water during low tide. The tidal basin can be regarded as a drainage provision that guarantees a minimum tidal flow to keep the river downstream open and alive, as long as the basin’s capacity to store the tidal prism is not reduced by sedimentation. Since 1997, the TRM concept was first applied to a depression area named as Beel Bhaina for four years (1997 to 2001) and then to another beel, named as Beel Kedaria from 2002 to 2005. Presently TRM is being applied to a third beel named Beel Khuksia. This paper focuses on the methodology and success and failure stories of the TRM and concludes by suggesting to apply the TRM continuously through one beel or another, to improve the drainage and to make the areas free from water-logging as far as possible.

Keywords: Tidal River Management (TRM), Tidal Basin, Beel (Local water bodies), Polder

Location:

Start Date:

End Date:

Program Area: Socio-economic and Policy

Non-commodity: Performance

Objectives:

Objective of this study was to study on sustainable drainage improvement under tidal river management in Khulna-Jessore area.

Methodology:

This paper discussed detail on the following sub-titles: 1. Introduction, 2. Need for trm, 3. Performance of beel bhaina, 4. Effectiveness of beel khuksia as a tidal basin and 5. Conclusions.

Source of Information: International Conference on Water & Flood Management (ICWFM 2007) 12 – 14 March 2007, BUET, Dhaka, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The long term siltation in the rivers of the southwest coastal region, since early 1980s till late 1990s, and the subsequent drainage congestion resulted in suffering to the local people. Many studies and measures were tried to improve the drainage congestion, but could not be very effective. The introduction of tidal basin along the Hari River, a nearly-dead river during the dry season, helped to increase the tidal prism and also scouring of the river bed considerably. The function of Beel Bhaina and Beel Kedaria as tidal basins sustained the drainage capacity of the Hari River from 1998 to February 2005 and there was smooth drainage of the project area. The closure of the function of the tidal basin caused reduction of tidal prism and heavy siltation in the river. Consequently severe drainage congestion was observed in the area. It has been found that the numerical modeling and monitoring are instrumental for planning,design, implementation and assessment of performance of tidal basin for Tidal River Management. The experience and knowledge gained in tidal river management in KJDRP area would be useful for planning and design of sustainable drainage management measures in similar water environment.

Knowledge Management: Report/Proceedings