Manville was severely hit by a flood in the wake of Hurricane Floyd in September 1999, which dropped of rain in the areas surrounding the borough. The floods devastated the Lost Valley section, some of the South side area along Main Street and a large portion of the North side. Water levels reached between and in parts of the borough on September 17, 1999. The only way residents could get help was by boat or helicopter. There was also a large amount of fuel oil floating on the flood water which further damaged homes, many of which came off their foundations.