Bangladesh is one of the most vulne

Bangladesh is one of the most vulnerable countries in the world to climate change (Intergovernmental Panel on Climate Change 2007). Hydrologic changes are the most significant potential impacts of global climate change in Bangladesh (Organization for Economic Co-operation and Development 2003). It has been predicted that due to climate change, there will be a steady increase in temperature and change in rainfall pattern of Bangladesh (Intergovernmental Panel on Climate Change 2007). Higher evapotranspiration due to temperature rise will demand higher amount of water for irrigation. At the same time the higher temperature will change the crop physiology and shorten the crop growth period which in turn
will reduce the irrigation days. These contradictory phenomena will change the total irrigation water demand which is required to quantify for long-term water resources
planning and management.