Great Diurnal Range (Gt) : The difference in height between mean higher high water and mean lower low water. The expression may also be used in its contracted form, diurnal range
National Oceanic and Atmospheric Administration NOAA, Tide and Current Glossary, National Ocean Service, CO-OPS, Products and Services N/OPS3, Silver Spring, MD, USA 1999. http://co-ops.nos.noaa.gov/publications/glossary2. pdf, (ND/ Tide and Current - Amer) {830}
