Print Email Facebook Twitter Study of methods for closing tidal channels Title Study of methods for closing tidal channels: Amtali Closure 6th interim report Author Burger, J.W. Visser, R.J. van den Heuvel, B. Smith, E.C. Corporate name Bangladesh Water Development Board Date 1982-07 Abstract The closure of the Amtall Khal was executed in the period December '81 to March '82 as a further experiment of the "Study of Methods for Closing Tidal Channels in Bangladesh”. The closure was executed as an Early Implementation Project on Flood Control and Irrigation in Bangladesh, financed by Netherlands Technical Assistance Programme. A team of three Dutch experts of HASKONING Consulting Engineers from the Netherlands, already involved during the past 5 years with introducing new closure techniques in Bangladesh, assisted the Bangladesh Water Development Board - engineers and the contractor with the execution of the work according to the designed closure method. The method was based on a8 gradual build upon an underwater sill on top of the river bottom, which was protected in advance by special mattresses to prevent any scour due to the currents. When the sill had reached a certain level, it s8lso was protected with special mattresses with the same purpose. Then a bridge type cofferdam construction was built across the river on top of the sill and the current was stopped by filling the cofferdam in two stages with clay filled gunny bags. The tidal range at Amtali was 2.4m at spring tide and 0.9m at neap tides. The tidal volume at spring tide was about 4 x 106 m3, and the channel's cross-section at mean water level was 640 m2. The width at the waterline was 123m and the maximum depth of the channel was 7.8m-PWD. More detailed information on the conditions at site are given in chapter 3. In chapter 4 the design and execution method are further elaborated. Subject AmtaliClosure worksBangladesh Classification TPN4000 To reference this document use: http://resolver.tudelft.nl/uuid:1528bc64-583f-416b-a609-03ee7c3f2b13 Publisher Bangladesh Water Development Board Part of collection Hydraulic Engineering Reports Document type report Rights Rights: © 1982 Netherlands Technical Assistance Programme Files PDF Amtali Closure.pdf 66.69 MB Close viewer /islandora/object/uuid:1528bc64-583f-416b-a609-03ee7c3f2b13/datastream/OBJ/view