Abstract:
The analysis of benefit-cost ratio and internal rate of return revealed that the mountain water supply system is the most suitable system for investment. The systems benefit-cost ratio is 24.69 IRR value is 24.99 per cent. The large scale artesian water supply system and the large scale surface water supply system, the value of benefit cost ratio and IRR are 2.49, 3.71 per cent and 3.38, 4.88 per cent respectively. When comparing the marginal benefit and marginal cost between the mountain water supply system and the large scale artesian water supply system, the ratio is equal to 0.4587. It is also the same, when comparing the marginal benefit and marginal cost between the mountain water supply system and the large scale surface water supply system, the ratio is equal to 0.5671. The result of this comparison supported the mountain water supply system is the most suitable system