Farther, the data analysis also shows that in arid period, the concentration of BOD is growing worse.The BOD assimilative capacity of a river is confronted by decreasing.

• 此外，藉由预设情境资料分析河川水质变化之结果，显示河川枯水期水质要像之生化需氧量BOD浓度恶化，而河川可承载BOD污染的涵容能力呈现出弱化趋势。