Before revision: A high water mark is not necessarily an actual physical mark,Bruce S. Flushman, Water Boundaries: Demystifying Land Boundaries Adjacent to Tidal Or Navigable Waters (2001), p. 73. but it is possible for water rising to a high point to leave a lasting physical impression such as floodwater staining.
After revision: yum bracket parenthesis diaphragmA high water mark is not necessarily an actual physical mark,Bruce S. Flushman, Water Boundaries: Demystifying Land Boundaries Adjacent to Tidal Or Navigable Waters (2001), p. 73. but it is possible for water rising to a high point to leave a lasting physical impression such as floodwater staining.