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Total Phosphorus (TP) as a development objective

Soil & Water Conservation Society of Metro Halifax (SWCSMH)

Updated: August 27, 2015                                                           Lake Carrying Capacities Homepage


Recommendation per the NALMS (2001) handbook

(cf. Holdren et al., 2001, North American Lake Management Society (NALMS) and Terrene Institute in cooperation with the U.S. Environmental Protection Agency)

"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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