of integrated index for evaluating water environment
Water quality standards have been used for evaluate water environment condition. Besides water quality, various factors are involved with soundness of water environment.
Therefore, the Ministry of Environment, Japan, developed an integrated index for evaluating river water environment. The integrated index can be used for comprehensive evaluation of all water environment factors. Water environment soundness is evaluated by (1)Natural state, (2)Rich plants and animals, (3) Clarity of water, (4) Pleasant waterfront environment, and (5) Regional culture on water, all of which come together to form the relationships between water environment and people.