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Updated: August 27, 2015
"Some typical restrictions include a certain percentage increase of phosphorus concentration above pre-development concentrations.
The Ministry of the Environment in Ontario, Canada, proposes a factor of 1.5 increase above prehistoric annual average phosphorus concentrations as target values for its more than 100,000 lakes on the Canadian Shield (Hutchinson et al., 1991).
The Swedish government endorses a maximum of twice the background levels of phosphorus (and nitrogen) as a national target.
Compliance with these targets can be evaluated only by using phosphorus models in which current anthropogenic sources are first included and used to verify the model and then removed to arrive at a pre-development phosphorus concentration."
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