ahhhh......here you go
https://www.tc.gc.ca/eng/civilaviati...0-008-1724.htm
12.0 WINTER OPERATIONS
Grooves cut into pavement will trap anti-icing/de-icing chemicals, reducing loss of the chemicals, and prolonging their actions. Grooving may also assist in draining melt water and preventing refreezing.
It is important to ensure that applied anti-icing/de-icing chemicals penetrate the grooves to prevent the formation of ice in the grooves.