Fig. 6. Retention efficiency of bioavailable phosphorus predicted by the model (lines) and observed in Wetland Sonnhof in 2001 (symbols) as a function of water residence time and concentration of dissolved reactive phosphorus at the inlet c_in(DRP). Line styles and symbol types indicate DRP inlet concentration. Two-day retention efficiency was calculated according to Eq. [15]. Twenty-two data points ranging between –60 and –500% (: 1–6 d) are not shown.