Borough by-laws must mandate that a construction that
exceeds the street height of an area identified on the attached map entitled
“Areas
of Tall Buildings ” (see Appendix
A) must:
Tend not to generate any wind impact whose average
speed at ground level, calculated on an hourly basis, is greater than 15
km/h in the winter and 22 km/h in the summer. Structures must also tend not
to exceed these average speeds for no more than 15% of the time on any
vibrant street identified on Map 2.3.3 entitled “Key Roadways of the
Centre”, 25% on the other streets identified on that map and 10% in a park
or other public place;
Tend not to generate gusts of wind at ground level which
exceed 75 km/h for more than 1% of the time. The reference period for the
evaluation of the gust of wind must be 2 seconds or less, with a turbulence
of 30%.
