Water is central to the way of life in Bangladesh and the single most important resource for the well-being of its people. It sustains an extremely fragile natural environment and provides livelihood to millions of people. Bangladesh is the terminal floodplain delta of three large rivers, the Ganges, the Brahmaputra and the Meghna, with over 90% of their catchment areas situated outside the country. Water management in Bangladesh is further complicated by high population density and expanding economic activities which severely adversely affect its rich and vulnerable ecosystems. The orientation of all water sector development schemes to this time has been almost exclusively aimed at achieving the goal of increased agricultural production in order to achieve national food security. The National Water Management Plan is intended to identify the needs and priorities for water resources management, the institutional structure through which these resources should be managed, and the process through which both institutional reform and priority interventions can be realized.; 2013

Traditional flood management interventions adversely affect floodplain ecosystem as they do not maintain flood flow vital for preserving the floodplain ecosystem. Flood management intervention needs to be planned and implemented considering ecohydrological criteria to sustain floodplain ecosystem. Consideration of ecohydrological criteria in flood management can restore or preserve the ecosystem of a deltaic floodplain. This study has developed a decision aid framework for determination of flood management option and regulation which consider both ecological and hydrological criteria in planning flood management intervention in deltaic floodplain. The study introduces a term ‘ecohydrograph’ that combines hydrological requirement of the floodplain ecological community with respect to seasonality, and implementation of which will help sustain the floodplain ecosystem. A simple decision aid framework has been developed that gives, as an output, an eco-friendly flood management infrastructure and operation rules for flow control structures corresponding to the ecohydrograph. Implementation of the ecohydrograph will reestablish a hydrological environment in a modified or damaged floodplain, which will support living system of the biotic community of the floodplain.; May 2011

Numerical modelling of alluvial rivers for planning,design and monitoring of river management problems have. gained appreciable momentum in recent years. This can be primarily asceribed to rapid strides achieved in the relm of digital computers as well as numerical methods. A major lacunae encountered by model developers and users can be turned as inadequate availability of sediment discharge data with respect: to space and time in a river. It is well stablished that quality of results of a numerical river model, especially, for an alluvial river mainly depends on sediment discharge data. To circumvent the problem of inadequate sediment discharge data, many research workers developed. different sediment discharge predictors over the years. The development of numerous sediment discharge predictors have made it incumbent to undertake comparative studies of different sediment predictors on an objective basis. Nakato has reported a comparative study of different models adopting measured data of the Sacramento river. However, Nakato based his comparative study through straight comparison by plotting the measured and simulated values. For a more objective assessment of the models, the criterion of 'trarnsinformat'ion' which has originated from the concept of entropy, has' been adopted for analysing the accuracy of twelve sediment discharge predictors. The present study reiterates the findings of. Amorocho and Espildora (1973), and Chapman (1986) regarding the efficacy of entropy criteria for objective assessment of hydrologic and hydraulic models. Using the data of the Sacramento river, the ranking obtained through application of entropy criteria is found to be in close agreement with the findings of Nakato. However further application of the above criteria needs to be extended to different rivers for a conclusive judgement on the accuracy of different sediment discharge predictors; December 1993