Abstract: Due to decreasing trend of river flow and increasing demand of water for irrigation, domestic and other purposes, it is an urgent need to investigate the scope of ground water (GW) development within safe yield criteria. Surface water (SW) and groundwater is a part and parcel of the hydrological cycle. So it is essential to consider both the ground and surface water in an integrated approach and this can be done using physically distribute mathematical modeling tools. In this paper, a case study was carried out for Panchagarh, Thakurgaon, Dinajpur and Joypurhat Districts which is situated in the north-west region of Bangladesh using physically distributed hydrological modelling. With the existing irrigation facilities, it was possible to bring only about 40% of the total cultivable land under irrigation. To bring more potential land under irrigation through sustainable water resources management, an integrated GW-SW model was developed using mathematical modelling software MIKE-11 and MIKE-SHE which was calibrated for the period 2003-2007 and validated for the period 2008-2009. Using model result, groundwater and surface water resources, possible expansion of irrigation coverage and a zoning map suitable for different mode irrigation equipment for the study area was assessed along with requirement of additional number of Deep Tube Well (DTW). Considering the scarcity of SW and safe yield criteria the potential GW was identified and additional 4803 DTWs of 2 cusec capacity for 28 Upazilas to cover the future demand. As a result irrigation coverage as well as agricultural production would be increased considerably if the project is implemented following the study findings and suggestions. Some area were also been identified which is potential for surface water irrigation. The economic analysis shows minimum EIRR value of 29.85% when all costs increase by 30%. So the study output has positive impact and for sustainable water resources management it is very essential to use the state-of -the art technology.
Keywords: Mathematical Modelling, Irrigation, Groundwater, Surface water, Zoning. Potential resources, Sustainable water resources management.
[1]. Abbott, M.B., Bathurst, J.C., Cunge, J.A., Ocinnell, P.E., and Rasmussen, J. (1986). An introduction to the European hydrological system—systeme hydrologique Europeen, She. 2. Structure of a physically-based, distributed modeling system. J. Hydrol. 87, 61.
[2]. Apul, D., Gardner, K., and Eifhmy, T. (2005). Probabilistic modeling of one-dimensional water movement and leaching from highway embankments containing secondary materials.Environ. Eng. Sci. 22, 156.
[3]. Bates, B.C., Kundzewicz, Z.W., Wu, S. and Palutikof, J.P. (2008): Climate Change and Water. Technical Paper of the Intergovernmental Panel on Climate Change, IPCC Secretariat, Geneva. 8.
[4]. Bronster, A., Jaegr, A., Ciintner, A., Hauschild, M., Doll, P., and Krol, M. (2000). Integrated modeling of water availability and water use in the semi-arid northeast of Brazil. Phys. Chem. Earth B 25, 227.
[5]. BADC (2008). Minor Irrigation Survey Report