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The present population of a community is 28000 with an average water consumption of 4200m³/d. The existing water treatment plant has a design capacity of 6000 m³/d. It is expected that the population will increase to 44000 during the next 20 years. The number of years from now when the plant will react its design capacity, assuming an arithmetic rate of population growth, will be
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- 5.5 years
- 8.6 years
- 15.0 years
- 16.5 years
Correct Option: C
| Population growth rate = | = 800 persons/year | |
| 20 |
| Percapita water consumption = | m²d/capita = 150 L/capita/d | |
| 28000 |
| For reacting design capacity, no. of popu required = | = 1200 | |
| 0.15 |
| ∴ No. of years = | = 15 years | |
| 800 |
