1.5 Inches in 15 Minutes Posted byLance Kleckner June 30, 2014December 28, 2022 Leave a comment on 1.5 Inches in 15 Minutes An Incredible amount of rain fell in a short period of time. A dry Vernal Pond was filled with water in a hurry. But during the height of the storm, the rush of water went over the dam and damaged it.