The Capability of Rainwater Harvesting as an Alternative Water Supply

Abstract

This Rainwater Harvesting System (RWH) is considered the Best Management Practice (BMP) which is being implemented in Malaysia. This system is not only intended to slow down the flow of runoff the surface is even used as a free and safe alternative source of water supply. However, it is mentioned that the system is not viable and impractical considering the construction and maintenance costs that had to be borne by the users of the system. However, several studies inside and outside the country show the Return on Capital (ROC) factor for this system only in a short period, i.e., between two and three years. This article aims to identify the capability of the experimental study site of Rabbitland Jengka Pahang, Malaysia in providing the most suitable or potential location to apply the RWH system. Moreover, it predicts the capability of the RWH system as well as the ROC ability of the system. Results indicate that the level of the system’s reliability is high and the ROC for the investment of the system takes only 36 months to recover the cost of the investment. The National Water Quality Standards (NWQS) for Malaysia proved that RWH and groundwater used are in class 3 which is suitable for livestock drinking, and external domestic uses, and needs extensive treatment for drinking purposes.