Question

The population from 1975 to 2015 are given below

Year	1980	1995	2010	2020
Population In 1000s	10	20	32	44

1. Use the data given in the table to draw the population – time relation in X-Y graph
2. Use the Graphical extension Method to find the population in 2050
3. According to the plotted graph, use only one method (Geometric Increase method or Arithmetic Increase method) to find the population in 2050 (Explain why you select this method)
4. Use the estimated population in 2050 to design the main sewer pipe running 0.6 times full at maximum discharge. The water supplied from the water works to the town is at a rate of 200 LPCD. The manning’s n = 0.015 for the pipe material and permissible slope is 1 ‰. Variation of n with depth may be neglected. Check for minimum and maximum velocity assuming that the groundwater level is lower than the sewer pipe level.

Answer 1