Imagine we have a ‘reset' button for civilization. Assume the city where you currently live in is starting afresh with 5,000 new settlers moving into the area. The population growth is estimated to be 10% on average in the first 10 years and then declines and stabilizes at 5% in Year 15. Modern drinking water supply needs to be installed. You are now contesting to be the chief engineer to lead the designing project for this water treatment plant. You are required to do the following tasks to demonstrate your knowledge and engineering skills:

1. State the principles you apply in your designs; (10%)

2. Enlist all the assumptions; (15%)

3. Estimate the required plant treatment capacity for the next 20 years; (15%)

4. Lay out the flow sheet of the process and justify your choice based on the characteristics of the source water (note: if data not available, you can make your estimations based on other similar sites or commensense); (20%)

5. Estimate the key parameters in the water treatment process including daily flow rate, detention time, geometry and dimension of the sedimentation tank, how many filters and frequency of backwashing if filtration is required, the required amount of chlorine if chlorination is the chosen. (40%)