At 72 ft x 32 ft, the 2,300 square foot Capitals Rink at Hi-Lawn is the largest outdoor rooftop synthetic rink in the nation.

Slush canons, snow bots and possibly heat pumps could help preserve ice on Ottawa’s Rideau Canal as winters shrink.

The free public rink has attracted millions of tourists ... The canons spray semi-frozen water onto the canal to help crystallize a thick layer of ice on the surface. Once an initial ice layer ...