Hydrological forecasts are used by many societal sectors, for instance warning services to prepare citizens for floods, farmers to plan agricultural practices (e.g. seeding, harvest, irrigation, fertilization) and reservoir managers to decide on water storage or release. Provide short-term forecasts (1-16 days ahead) of streamflow for all sub-catchments in the GM, including warning services to help citizens, water planners, reservoir operators and farmers to make water-food-energy plans (storage/release). Short-term forecasts are for immediate actions while seasonal forecasts affect more strategical decisions and market prices. Besides, short-term forecasts provide data about water and sediment inflow to reservoirs in the GM so that reservoir operators can plan their water storage and release accordingly. Calculations are made on a daily time step.
Currently, the 1-16 days forecast in Asean Water Portal is based on one single deterministic meteorological forecast for each geographical domain. In most applications, the graph also show return periods for high flows and sometimes, the map is colored based on thresholds in return periods.