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Water is vital to the existence of all living organisms, but this valuable resource is increasingly being threatened with increasing population growth and demand for high water quality for both domestic purposes and economic activities. A critical factor in the estimation of waste water generation is the population growth. The population of the Hubli-Dharwad twin cities is the second-largest in Karnataka, after Bangalore. The present study was based on secondary (time series) data. The population and sewage water flow in twin cities was found to have increased almost nearly about twelve times with the growth rate of 1.07 percent per annum. The projected future population and sewage water generation from twin cities for three decadal points of time showed an increasing trend. This poses a challenging task in future with respect to management. The farmers consider the resource as a boon which provides water for irrigation throughout the year and serves as a source of income and employment.
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