In winter the varying depth of snow may exert an appreciable effect.
I), varying in length from a few lines up to several feet.
And varying from point to point.
It will be noticed that the difference between the greatest and least hourly values is, in all but three winter months, actually larger than the mean value of the potential gradient for the day; it bears to the range of the regular diurnal inequality a ratio varying from 2.0 in May to 3.6 in November.
On the west the shore is perfectly flat, so that a slight rise in the water causes the inundation of a considerable area - a fact not without its influence on the estimates made at varying periods as to the size of the lake.