Leong Boon Tik ，马来西亚泰莱大学，建筑与设计学院
FINANCIAL VIABILITY OF RAIN WATER HARVESTING SYSTEM IN DOUBLE STOREY TERRACE HOUSES IN MALAYSIA
Leong Boon Tik
School of Architecture， Building and Design， Taylor's University， Malaysia.
Wong Yee Wan
School of Architecture， Building and Design， Taylor's University， Malaysia.
Theong May Chuan
School of Architecture， Building and Design， Taylor's University， Malaysia.
Soon Lam Tatt
School of Architecture， Building and Design， Taylor's University， Malaysia.
Abstract： Concerning the world population growth， by year 2025， approximately two-third of the world population would be at risk of facing water stress， if present water usage trend continues. Ministry of Housing and Local Government in Malaysia introduced “Guidelines for Installing a Rainwater Collection and Utilization System” in year 1999， which aims to reduce the dependence on treated water and to provide a convenient buffer in times of emergency or a shortfall in the water supply. Based on the research carried out by National Hydraulic Research Institute of Malaysia （NAHRIM） on a pilot project for a double storey terrace house， rain water harvesting system is able to save up to 34% of public water use， in addition to the 10% of reduction in peak discharge assuming every terrace house has been installed with the same system. Anyway， the economic aspects of rainwater harvesting system appear to the concerns for the success of the system implementation. This paper describes the financial viability of rain water harvesting system in double storey terrace houses in Malaysia. Results shown that payback period is 49 years， Return on Investment （ROI） 4.05% and Net Present Value （NPV） for 60 years using 10% discount rate is -RM 4308.44.
Keywords： Financial Viability， Malaysia， Rain Water Harvesting.
马来西亚双层排屋雨水收集系统的经济可行性
Leong Boon Tik
马来西亚泰莱大学 建筑与设计学院
Wong Yee Wan
马来西亚泰莱大学 建筑与设计学院
Theong May Chuan
马来西亚泰莱大学 建筑与设计学院
Soon Lam Tatt
马来西亚泰莱大学 建筑与设计学院
摘要：伴随着世界人口的不断增长，如果一直维持当前的用水趋势，到2025年，全世界约三分之二的人口将可能面临水荒。马来西亚信息部及当地地方政府部于1999年引入了“雨水收集及利用系统安装指南”，旨在降低对净化水的依赖程度，和缓解在紧急情况或水资源短缺的用水情况。马来西亚国家水利研究院（NAHRIM）对双层排屋试点项目的研究显示，雨水收集系统能够节约高达34%的公用水。此外，如果各类排屋均安装这一系统，还能使最大排放量降低10%.但雨水收集系统的经济因素似乎成为了影响这一系统能否成功应用的关键。本文论述了马来西亚双层排屋雨水收集系统的经济可行性。结果表明：投资回收期为49年，投资回报率（ROI）为4.05%；在贴现率为10%的条件下，60年的净现值（NPV）是4308.44马来西亚令吉。
关键词：财务可行性，马来西亚，雨水收集