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Current water resources management practices in most developing countries result in unnecessarily high economic and environmental costs. The magnitude and consequences of such costs have spurred the emergence of a global consensus on principles for improving water resource management. India will face an acute scarcity of water by 2025, more than most nations in the developing world. There is compelling evidence that improved water resources policies can have major impacts. In a number of cases in developed and developing countries pricing and tariff combined with regulations have produced savings of 20% to 30% and more. Improving water management will require that developing countries address the major constraints that currently undermine the allocation and efficient use of their water resources. Experiences in both developing and developed countries, as presented in this article, showed that improved policies for conservation and reallocation can have major benefits. The concerned authorities should look for various alternatives such as rainwater harvesting, recycling of wastewater, reducing un-accounted water and other options. Rainwater harvesting should be made compulsory; wastewater reuse has to be made with dual water supply system for new layouts. As the suburbs in the city are increasing day by day, rainwater harvesting would be able to serve the city for much longer time.
In this work, the three-dimensional Poisson’s equation in cylindrical coordinates system with the Dirichlet’s boundary conditions in a portion of a cylinder for is solved directly, by extending the method of Hockney. The Poisson equation is approximated by second-order finite differences and the resulting large algebraic system of linear equations is treated systematically in order to get a block tri-diagonal system. The accuracy of this method is tested for some Poisson’s equations with known analytical solutions and the numerical results obtained show that the method produces accurate results.