| Summary: | Sustainable use of water could maintain a balance of its demand and supply. Rainwater harvesting system is a best management method in effective water management practice in Malaysia. RHW is the most traditional and sustainable method
because this system aims to slow down the flow of surface runoff and promote efficiency use of water. The study of RHW was conducted at Surau An-Nur. The rainwater collection had been done in between October 2017 and April 2018. For this study, the parameters of rainwater have been analysed for the physical, chemical and biological. From the test, turbidity is 3-7 mg/L, pH is 5.13-6.44, dissolve oxygen is 5.76-7.73 mg/L, iron content is 0-0.011 mg/L, copper content is 0-0.012 mg/L, total coliform is 0-1.3 MPN and total suspended solids is 3-7 mg/L. Based on the result obtained, it indicates the rainwater is suitable to be used for ablution. The design had been done using Tangki Nahrim Software and installation cost had been calculated. The size of the tank is 1.75 m3 and the total cost of the installation rainwater harvesting system is RM 1571.00.
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