Print Email Facebook Twitter Early implementation projects on flood control and irrigation in Bangladesh Title Early implementation projects on flood control and irrigation in Bangladesh: Study of methods for closing tidal channels; third interim report Author Smith, E.C. Zwets, J. Corporate name Bangladesh Water Development Board Date 1978-08 Abstract Methods of closing tidal channels as at present applied in Bangladesh have been developed since many years in an imperical way. As the size of closure gaps in future will increase, a more systematic approach will be required to close those bigger gaps. It was therefore agreed that as a first step bottom protection mattresses should be introduced for the closure of the Madargong. A team of Dutch experts was sent by the end of 1977 to Bangladesh for a few months to advice on the design, the manufacure and the .sinking of the bottom protection mattresses. One team member stayed a little longer and attended the actual closure to review the effects of the mattresses. The application of a bottom protection with mattresses of 50' x 100' made of bamboo gratings and goalpata (palmleaves), posed no real problems and had good results as far as bottom protection is being considered. The closure itself of the Madargong by means of the local mata-method however failed twice, although the flow could be stopped during low water. The failures were the direct result of: - A series of slidings in the preparatory stage, presumably caused- by using of too much clay fill for the cross dam of the right bank. The slidings causing large delays in dumping of matas and giving later rise to further damage during the closure work. - Insufficient mobilization of experienced labourers by the contractor for the closure works, even insufficient mobilization of inexperienced local labour during the critical stages of the closure. - Large delays of a month and more in the execution of the closure work, far beyond the end of the dry season, but also delays of a few days after a neap tide and even a few hours after the lowest water level. - Lack of supervision and management of the contractor, causing shoddy work regarding making of ropes and matas, also causing confused situations during the critlcal stages of closure, and finally causing the missing of two opportunities to still close the gap by forceful attempts. Subject BangladeshChakamayaAmtaliMadargongClosure works Classification TPN4000 To reference this document use: http://resolver.tudelft.nl/uuid:44887e1b-7b9f-49a6-8735-4a19d8806ceb Publisher Bangladesh Water Development Board Part of collection Hydraulic Engineering Reports Document type report Rights (c) 1978 Netherlands Technical Assistance Programme Files PDF BWDB 3rd interim report.pdf 93.42 MB Close viewer /islandora/object/uuid:44887e1b-7b9f-49a6-8735-4a19d8806ceb/datastream/OBJ/view