I stopped the river that ran through his shop, but can't stop the small stream. For whatever reason, concrete and sedimentary rocks are porous, and many drips become a small stream. I am taking the bench apart and will fill in the cavity between the shop wall and the underside of the waterfall. I argued for that when we built the structure but Bill wouldn't have it. Now he doesn't care what we do but if we don't stop the stream he is shutting down the waterfall. Like I told my sister yesterday, "unfortunately, water runs down hill, so we have to create an uphill side near the shop.