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The Training of Trainers (TOT) Workshop on Rainwater Harvesting took place in Vava'u, Tonga from 12-15 May 2004. Involving community extension workers from the Village Women's Development Programme (VWDP) of the Tonga Community Development Trust (TCDT), the training was based on a participatory approach that emphasised 'learning-by-doing'. Using a step-by-step process, workshop participants were introduced to various participatory tools and took part in participatory activities and exercises that they could potentially use during future training on rainwater harvesting in communities.

At the 3rd World Water Forum held in 2003 in Kyoto, Pacific island country ministers, delegations and representatives of civil society, reaffirmed their commitment to the United Nations Millennium Development Goals and Targets of halving by 2015 the proportion of people without sustainable access to safe drinking water and basic sanitation and the World Summit for Sustain- able Development (WSSD) Plan of Implementation.

Water is essential for human, faunal and floral physiology. Water sustains life and is essential for climatic equilibrium, the maintenance of ecosystems, agriculture, industrial processing and hydropower. In many countries, increasing population, natural resource extraction, food production, industrial activity and other land uses are producing diffuse and point source discharges which carry a wide range of contaminants into water bodies and affect the quality and quantity of water for other uses. This situation is caused by ineffective assessment, planning, utilisation and management of water by water resources management authorities, water supply and sewage disposal service providers and other sectoral users of water resources. There is an immediate and critical need for Integrated Water Resources Management (IWRM) in a catchment unit in order to ensure the sustainable use of the available water resources.