Figure 5.25 - a) The cumulative percentage of in-lake total phosphorus concentration in 46 Danish lakes during the periods 1972­79 and 1985­89;

b) the cumulative percentage of summer water transparency (Secchi depth) in 46 Danish lakes during the periods 1972­79 and 1985­89

Source: Redrawn from Kronvang et al, 1993