| [comprehensive cost-benefit evaluation for the improvement of rural water supply in hunan province]. | comprehensive cost-benefit evaluation for the improvement of rural water supply was conducted according to the national standard methods for analysis of water quality. results showed total bacteria count and coliform group count in the water declined by 51% after the improvement, and synthetic index of water quality declined to 19% of that before the improvement. environmental epidemiological studies showed yearly incidence of hepatitis a, typhoid fever, diarrhea and enteritis decreased by 2.20/ ... | 1996 | 8758865 |