Design of a system of snow removing gutters and the amount of water required for the snow removal

In heavy snow area in Japan, more than 40 percents of roads are narrow; so that snow machines often cannot pass through them and such roads are closed by deep snow for a long time. It seems that the best way to circumvent this problem is to replace road gutters with snow removing gutters. It is known that running water in a gutter is able to flow equivalent volume of snow, and that the flow rate (the required volume of water per hour) is easily estimated by the volume of snow which is thrown into the gutter.