Resident David Becker shows a Lego block measuring guide his children made a few years a how much their street has sunk June 28, 2018 (they add a row of Legos as the distance between the street level and top of sidewalk grows). Even older sinkage is demonstrated by the vertical depression in the surface of the curb were it meets the street. Neighbors call it Nightmare on Monroe Street. For the last six years, resident on the tiny 100 block of Monroe Street have had flooding, a sinking street, broken water pipes and now a decrepit street all due to an ongoing fight with the Philadelphia Water Department over who is at fault for these issues. TOM GRALISH / Staff Photographer