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vee sügavus, kus vertikaalselt sukeldatud Secchi ketas pole veepinnalt enam nähtav, depth at which a Secchi disk disappears from view when lowered into the water
profondeur de disparition du disque de Secchi . Limnoloogia sõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//lim/profondeur%20de%20disparition%20du%20disque%20de%20Secchi/1/fra (07.08.2026)
