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… of human history, wetlands have remained in disrepute. Drainage and reclamation have always been considered … something to be confined by embankments or got rid of by drainage - especially where fertile plains were created for … bowls” of the Midwest made the perils of ill-considered drainage easier to appreciate. President Franklin D. …

… most threatened ecosystems, owing mainly to ongoing drainage, conversion, pollution, and over-exploitation of … settling ponds, oxidation basins, etc. 9 -- Canals and drainage channels, ditches. Zk(c) – Karst and other …

… and regulation of coastal defences, maritime traffic and drainage. Key threats requiring ongoing attention include …