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محیط زیست و منابع طبیعی::
پهنۀ آبی|پیکره آبی
Accordingly, standard values are set for water quality parameters in order to conserve public water bodies such as rivers, lakes and coastal seas.
, Class AA-E for rivers) and the adaptability of the use of each water body, with standard values set for them.
As for water bodies that extend across more than two prefectures, the government sets targets for principal ones; those for the other water bodies are set by the prefectural government concerned.
When planning a water quality improvement measure that uses a river flow purification method, the hydraulic and water quality characteristics of the subject water body and the site for facility construction shall be investigated, and the optimal method and scale for the characteristics of the water body shall be determined.
When a river flow purification method is used, a purification method suitable for the hydraulic and water quality characteristics of the subject water body shall be selected.
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