FINAL REPORT - International Joint Commission

Step 5 – Ice limit: Exactly the same ice limits that were used for Plan 1998 are applied in Plan A + .
During the non-navigation season, the maximum allowable release is that which will keep Long Sault
at 71.8 m (235.56 ft) or higher. In addition, during ice formation, the maximum allowable release is
6,250 m3/s (220,700 ft3/s). The Ice Limit release applied is the minimum of the two.
ANNEX 3
Step 6 – Minimum allowable release: Finally, an absolute lower limit of 4,000 m3/s (141,300 ft3/s) is applied.
Target Levels/Releases for the Optimization Model
Target levels and releases
The target levels outlined in Figures B-14 to B-17 come from the PIAG_Yr4_Draft_17 PowerPoint file, which
outlines all the existing suggested criteria. For a given period, the target maximum level is the minimum of
the various maxima, the target minimum level being the maximum of the various minima. (For purposes
of conversion from metric to Imperial units, 1 metre = 3.28084 ft and 1 m3/s = 35.31467 ft 3 /s).
Figure B-14: Lake Ontario target levels
Level (m)
Level (m)
Figure B-15: Lac St. Louis at Pointe Claire target levels
Options for Managing Lake Ontario and St. Lawrence River Water Levels and Flows
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