water management water 49 water structures 34 hydrology 30 water courses 26 water supply engineering 23 water pollution 20 more ... hydraulic structures 17 river basin 17 environment 17 irrigation 16 waste water 15 waste water treatment 14 history 13 water quality 13 permanently sustainable development 13 vodní právo 13 vodní zdroje 13 sewerage 12 climatic changes 12 environmental management 12 flood control 12 zásobování vodou 12 channels 11 drainage 11 water reservoirs 11 agriculture 11 water courses regulation 11 water mains 10 hydromeliorations 9 less ...