water management water 54 water structures 34 hydrology 31 water supply engineering 29 water courses 27 water pollution 22 more ... environment 20 environment protection 19 hydraulic structures 18 waste water 18 permanently sustainable development 18 river basin 17 waste water treatment 17 irrigation 16 water quality 15 sewerage 15 vodní zdroje 14 history 13 climatic changes 13 water reservoirs 13 vodní právo 13 zásobování vodou 13 environmental management 12 flood control 12 drainage 11 water mains 11 agriculture 11 water courses regulation 11 anti-pollution protection of water 10 less ...