MANCO 21st :Development of climate-smart Decision Support System for Water Allocation at Paddy Dominant Agro-hydrological Watershed

Development of climate-smart Decision Support System for Water Allocation at Paddy Dominant Agro-hydrological Watershed

  1Rowshon MK, 1Dlamini NS and 2Amin MSM 1Department of Biological and Agricultural Engineering, Faculty of Engineering Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

E-mail: rowshon@upm.edu.my and HP: 0126627589 2

Crop Production Programme, Faculty of Sustainable Agriculture, Universiti Malaysia Sabah 
 
Abstract   Global water scarcity remains the main growing challenge faced by the agriculture sector. This condition is attributed partly to the tremendous increase in the demand for different water uses and the climate change phenomena. Modelling irrigation water allocation for systems such paddy fields under changing climate requires several procedures that may be tedious for water users such as farmers. Climate-smart Rice Irrigation Management Information System (CSRIMIS), is a user friendly decision support program developed in this study to simulate water allocation deliveries in paddy fields at Tanjung Karang irrigation scheme while accounting for the impacts of climate change. The program is driven by climate data derived from 10 global climate models (GCMs) statistically downscaled under 3 emission scenarios RCP4.5, 6.0 and 8.5. A stochastic daily rainfall model was developed for forecasting future rainfall. Outputs of a hydrological model were incorporated in the program for assessing flows of the Bernam River, which is a source of irrigation water for the scheme. The program assess water requirement by adjusting the reference evapotranspiration (ETo) for projected future carbon concentration based on GCM simulations The program comprises of 4 key modules; stochastic rainfall, reference evapotranspiration, water demand and water allocation and monitoring. MATLAB programming language was used to develop the program and its graphical user interface (GUI). The interface is the framework for linking all the modules of the program and provides the user with the ability to access data and output for the system, based on a mouse-driven approach with pop-up windows, pull-down menus and button controls. This paper discusses the CSRIMIS program and presents some of its outputs as relates to the 4 modules. Key words Climate change; rice; CSRIMIS, GCM, irrigation, modules