Feasibility testing of rainwater quality for rainwater harvesting application.

Potential rainfall in Indonesia can be significantly utilized as an alternative source of raw water. According to the water resources Law No. 17 of 2019 Article 29 declare that the utilization of water resources does not only include surface water, groundwater, or seawater, but also rainwater. Uncontrolled groundwater abstraction can cause adverse impacts, including groundwater crises, land subsidence, or seawater intrusion. Therefore, alternative water sources are important to be explored, one of them by utilizing rainwater. The challenge will face in utilizing rainwater as raw water is the existence of rainwater not continuous and strongly influenced by the seasons. Therefore, a method of harvesting must be implemented to store and save the water to be used when there is no rain. Besides that, water quality testing is essential to ensure the water sources able safe for consumption. This research focused on analysing the chemical quality of combination between two sources, groundwater and rainwater, in order to maintain the volume of water in storage, especially in dry conditions. The sample consists of 2 samples from rainwater and 2 samples from groundwater. Based on the chemical quality test of the sample by ratio mixing 10%-90% of rainwater and groundwater, the water quality criteria fall into the Class II and III categories. According to the Government Regulation (PP) No. 22 of 2021 for the Implementation of Environmental Protection and Management, this class is for freshwater fish farming, animal husbandry, and water for watering plants or other things that require the same type of water as the things that are used. [ABSTRACT FROM AUTHOR]