Re: How to cut grooves in concrete sidewalk

The boulevard I referred to is the grassed area beyond the sidewalk. 
I used the garden hose method to tunnel the pipe under the sidewalk sidewalk for a sprinkler system. 
I was suggesting that this approach might not work for a boundary wire such as for an invisible pet fence or robotic lawn mower because the thickness of the sidewalk could require the the wire to be too deep below the surface.

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