council decis juli conclus behalf commun convent protect transboundari watercours intern lake ec council european union regard treati establish european commun articl conjunct sentenc paragraph subparagraph articl thereof regard propos commiss regard opinion european parliament regard opinion econom social committe commiss part behalf commun negoti ad hoc work parti prepar convent protect transboundari watercours intern lake convent sign behalf commun helsinki march main purpos convent establish framework bilater multilater cooper prevent control pollut transboundari watercours ensur ration water resourc member countri unit nation econom commiss europ commun adopt measur field cover convent commun respons enter intern commit matter commun polici environ contribut pursuit object preserv protect improv qualiti environ protect human health prudent ration natur resourc view sustain develop commun polici environ aim strengthen intern cooper order achiev high level protect base precautionari principl principl prevent action environment damag prioriti rectifi sourc pollut pai respect sphere compet commun member state cooper countri compet intern organ conclus convent commun achiev object set articl treati decid articl convent protect transboundari watercours intern lake approv behalf european commun text convent attach annex articl presid council author design person person empow deposit instrument approv gener secretariat unit nation accord articl convent person person time deposit declar compet attach annex ii brussel juli council presid solb mira oj oj oj