11/12/2018

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Phosphorus effects in lakes

Here you can calculate the effect of phosphorus input into a lake. You can provide lake data yourself, or you may selecet a lake from the drop-down menu and get the lake data automatically set into the form below. However, for a number of lakes there are no data regarding average depth and volume. Also, the P input always has to be typed in by the user. Data regarding inflow and residence time are averages for the period 1991 - 2005. Please note that the model calculations are associated with rather large uncertainties.

Select a lake:  
 
Lake data
  Annual P input  kg/yr
  Annual water inflow  m3/yr
  Average depth  m
 
 Estimate the average depth from the max depth   m
   
  Lake volume  m3
 
 Estimate the lake volume from its surface area   m2
   
 
Calculation
  Average residence time  yr
  Phosphorus concentration in inflow, annual average  mg/l
  Phosphorus concentration in the lake  mg/l
  Concentration of chlorophyll a in the lake, annual average  ug/l
  Secchi depth in the lake, annual average  m