Imagine being tossed around by the rush of floodwaters, hanging on to a rooftop for dear life while the thunderclap of a massive wave destroys your childhood home; or helplessly watching as those around you are carried off to a watery grave. That is what Victor Heiser, a survivor of the 1889 Johnstown Flood endured. Victor Heiser’s written description of the flood is a chilling account of...