State of Florida Department of Environmental Protection David B. Struhs, Secretary Division of Administrative and Technical Services Florida Geological Survey Walter Schmidt, State Geologist and Chief Forse v"eY .. Seasonal Variation in Sand Beach Sh e Position and Beach Width mslB alsilie and Open-Ocean Water Level Datum Planes Use and Misuse in Coastal Applications by " ii~~~~~~~iii~~~~............ ..... ......by .... ,,i :.H .: .. :, James H. Balsillie Published for the Florida Geological Survey Tallahassee, Florida 1999