Abstract
Indonesian airport in general relies dominantly on the surface and underground water to fulfil its water demand. Although groundwater systems are generally more resilient to climate change than surface water sources, their overuse might damage those water systems. One alternative to overcome this problem is rainwater harvesting (RWH) which could be implemented to increase the availability of raw water supply. However, in Indonesia, the study of the potential of RWH at a regional scale is still limited, so it does not provide sufficient information for practical application. Therefore, as the objective, this research will utilize a simulation analysis method to calculate the volume of rainfall storage, water requirements and reliability levels at I Gusti Ngurah Rai Airport regarding variations of the catchment area. This scheme would be applied not only during the dry and rainy seasons but also during the El Nino event. Moreover, the rainfall return periods would be determined to define the potential size of a rainwater harvesting system yearly. As a result, RWH at I Gusti Ngurah Rai Airport has the potential to substitute the surface water (PDAM) and groundwater usage either fully or partially depends on the season and water catchment area.
Potential of rainwater harvesting (RWH) to overcome the problem of water scarcity at the airports: a case study in I Gusti Ngurah Rai Airport, Bali
