It is still a few weeks from now and I can go to the office again on ice skates. This will be a nice commute. There is already a thin crust and expect this to become solid soon. The environmental situation of these canals has been much better this year, than before. Formerly, there was color and chemicals dumped in, to make the it not flip over into a stinking mud. This year solar powered ventilators have been applied, besides a lot of measures cutting out the access wheat. This looks like quite a successful method to keep the oxygen level in the water up.
Thin ice on the Sanlitun canals.
Solar powered ventilation of standing waters.