Rainwater Harvesting for Water Conservation in Sanur’s Tourism Harbour Building: A SWMM Simulation

Civil Engineering Department, Faculty of Engineering, 11480 Bina Nusantara University, Jakarta, Indonesia

^* Corresponding author: osetyandito@binus.edu

Abstract

This study focuses on the implementation of rainwater harvesting as a water conservation alternative in the Sanur International Tourism Harbour Building. The research was conducted to evaluate the effectiveness of this technique in reducing the building’s dependence on freshwater resources and to determine its potential as a sustainable water management solution. The implementation of rooftop rainwater harvesting was considered, and SWMM (Storm Water Management Model) simulation was used to model the hydrological processes, including rainfall, runoff, and infiltration in the study area. The model was calibrated using observed rainfall data collected from the vicinity. The results of the SWMM simulation showed that the rainwater harvesting system was effective in reducing the building’s dependence on freshwater resources and that the system can collect an estimated 41.58 m3 of rainwater. This amount is deemed sufficient to support and overall reduce freshwater consumption and contribute to the conservation of freshwater resources in the area. The study demonstrated the potential of rainwater harvesting as an effective water conservation method for buildings in Sanur, Bali. The implementation of such a system can not only reduce freshwater consumption but also contribute to sustainable water management practices in the region.