新暦
In the 17th century Arlingham experienced some severe flooding. 1607 saw The Great Flood of Arlingham. This was part of the Bristol Channel floods, 1607. Some scientists believe this may have been a storm surge, a combination of meteorological extremes and a high tide. However, Professor Simon Haslett of Bath Spa University and Australian geologist Ted Bryant of the University of Wollongong, published a research paper in 2002, in which they argue that there is evidence to suggest this may have been caused by a tsunami. As a result of this flooding, the current of the River Severn changed. The riverbanks were strengthened and the area now known as "The Warth" was enclosed and recovered from the river. Modern sources give the date of this flood as 1607, whereas older sources, give the date as 1606. This is due to the use of Old Style and New Style dates. Older sources use the Julian calendar, where the new year starts on Lady Day, 25 March, whereas more modern sources use the Gregorian calendar, with the new year starting January 1. In some sources both dates are given i.e. 1606/1607.