Water sources in most of the countries are stressed. Considering the importance of need of sustainable water supply in developing countries, United Nations promulgated famous Millennium Development Goals (MDGs) which thrust upon the availability of water supply to all sectors in sustainable manner. One of the impediments to achieve the goals is the intermittent water supply in developing countries. As on in Asia region very few cities get 24x7 continuous water supply. There have been various attempts to achieve this most challengeable task which are based on the concept of tackling the problem from part-to-whole. However, this approach has been not so successful in India, resulting into non achievement of the goal. There is need to rethink about it.

Objective of this paper, therefore, is to present another approach which addresses the problem in reverse way of the existing practice, i.e., from whole-to-part. It also unfolds various characteristics of the hydraulic model that has been prepared to simulate the real time conditions in the distribution system and describes how it could be applied while transforming an intermittent water supply system into 24x7 system for developing countries. The approach has been discussed in details along with its application and a case study of Badlapur.