This summer, three students in Historic Preservation from Columbia University's Graduate School of Architecture, Planning, and Preservation are conducting a conservation study for Moni Perivolis, a historic convent on the island of Lesvos, Greece, and 11 other churches on the same island that were included in the World Monuments Watch in 2008 and 2010. Below, Tony Baragona describes the investigation of the movement of water at Moni Perivolis