Running rain gutter drain line under sidewalk
I have a rain gutter whose downspout empties onto my driveway resulting in black mildew on the concrete. On other downspouts I have extended the lines under garden beds and out into the lawn. However, for this one, I would need to go under the front sidewalk. Is there a special tool or an easy procedure that would allow me to dig a tunnel under the sidewalk large enough to run a gutter extension line?
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