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| 1 | comprehensive basin-wide planning of sewerage systems | 流域別下水道整備総合計画 | |||
| 2 | comprehensive plan for developing a sewage system for each river | 流域別下水道整備総合計画 | |||
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|---|---|---|---|---|---|
| 1 | comprehensive basin-wide planning of sewerage systems | 流域別下水道整備総合計画 | |||
| 2 | comprehensive plan for developing a sewage system for each river | 流域別下水道整備総合計画 | |||
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