kvalita vody 8 [vynechat] water quality mokrade 2 [vynechat] ochrana mokradí 2 [vynechat] voda 2 [vynechat] vodné hospodárstvo 2 [vynechat] vodné toky 2 [vynechat] water 2 [vynechat] water management 2 [vynechat] water streams 2 [vynechat] wetland conservation 2 [vynechat] wetlands 2 [vynechat] biodiversity 1 [vynechat] biodiverzita 1 [vynechat] countries of the world 1 [vynechat] drinking water 1 [vynechat] eutrofizácia vôd 1 [vynechat] eutrophication 1 [vynechat] hydrology 1 [vynechat] hydrológia 1 [vynechat] irrigation devices 1 [vynechat] krajiny sveta 1 [vynechat] lowlands 1 [vynechat] modernization 1 [vynechat] modernizácia 1 [vynechat] nížiny 1 [vynechat] ochrana vodných zdrojov 1 [vynechat] ochrana vôd 1 [vynechat] pitná voda 1 [vynechat] pollutants 1 [vynechat]