El Nino frequently results in protracted droughts through decreased rainfall concentration, which may cause rivers, lakes, and reservoirs to become depleted. One of the mitigation plans to reduce this impact is by applying the sustainable water management solution. Rainwater Harvesting system has been proposed where the system can directly collect rainfall. This water can be stored for later use or returned into the groundwater system. With additional financial advantages, rainwater harvesting systems (RWHS) can increase water supply to suit urban and rural demands. However, the application of RWHS for the large scale of water demand such as educational institution have been scanty, therefore the aims of the study are to evaluate the suitability of rainwater harvesting installation in educational institutions, thus able to propose the suitable number of tanks. The analysis using Tangki NAHRIM 2.0 software was conducted to determine the suitability of the implementation. Rainfall at location, roof information, water demand, and tank capacity were the data that needed to be input in the software. Then, the data were analysed to evaluate the suitable rainwater harvesting tank for the
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