The population of a city in 2000 is 50,000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be

Water Supply Engineering is a branch of engineering concerned with the development of sources of supply, transmission, distribution, and treatment of water.

The term is commonly used for municipal (city) water works, but applies also to water systems for industry, irrigation, wastewater reuse, and other purposes.