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Even in humid tropical Malaysia where rainfall is abundant (annual rainfall 2400mm for Peninsular Malaysia), water fluctuations due to a lack of rainfall do happened as in the 1998 drought which brought unpleasant water supply disruptions for Klang Valley folks.

Following this Water Crisis, the Minister of Housing and Local Government on 7 May 1998 has expressed the Government’s interest for houses to be designed for collecting rainwater. In 1999, the Ministry of Housing and Local Government has produced a Guideline on Installing a Rainwater Collection and Utilization System.

In support of the Government's interest in rainwater harvesting, NAHRIM through collaboration with other government agencies such as Department of Irrigation and Drainage (DID), Department of Local Government, Universiti Teknologi Malaysia (UTM), Universiti Sains Malaysia (USM) and Universiti Malaya (UM) is currently pursuing R&D on rainwater harvesting focusing on hydrologic and hydraulic design, system design and performance, installation and operational costs and water quality aspects.

Consequently, NAHRIM is currently carrying out a study for a double storey terrace house located at Taman Wangsa Melawati, Kuala Lumpur focusing on utilising rainwater for non-potable household use such as toilet flushing, washing clothes and general cleaning around the house including car and motorcycle washing.