At around 1 p.m. Sunday, a large slab of concrete fell from the third-floor facade of the University of Wisconsin Van Hise Hall, crashing directly in front of its main entrance, according to a tweet ...

To install a French drain the first step is to dig a 6-inch-wide by 18- to 24-inch-deep trench around the perimeter of the slab. Line the trench with heavy plastic.