System, as well as wave and water level information, and techniques which 

 could be used for future overtopping studies at Point of Pines and Lynn 

 Harbor. The study was then divided into two main sections, determined by 

 whether the cause of the water levels was due to wave overtopping or combined 

 surge and tide. Roughans Point was the only location where stage-frequency 

 curves were generated for flooding resulting from wave overtopping. For the 

 Saugus-Pines River System, flooding results from the inundation of low lying 

 areas by the combination of storm surge and astronomical tide. Even though 

 flooding at Revere Beach, Point of Pines, and Lynn Harbor is caused mostly by 

 wave overtopping, only the still-water level frequency will be reported be- 

 cause the present study did not include investigation of overtopping for these 

 areas. Wave overtopping for these areas will be estimated by US Army Engineer 

 Division, New England (NED), in other studies using techniques and data devel- 

 oped by US Army Engineer Waterways Experiment Station (WES) Coastal Engi- 

 neering Research Center (CERC) for the present study. Areas where the stage- 

 frequency curves are based upon combined surge and tide levels, but include no 

 wave effects, will be referred to as still-water level locations. 



Terminology 



3. To avoid excessive repetition and to provide greater clarity, the 

 following terms are defined for use throughout this report. 



Event Storm plus tide 



MSL Mean sea level 



NGVD National Geodetic Vertical Datum (formerly 



called mean sea level datum of 1929) 



Northeaster Extra-tropical storm 



Stage Elevation of the still-water level above NGVD 



Still-water Level Elevation of surge plus tide water surface 



Storm The historical meteorology (wind, waves, and 



surge) independent of the tide with which 

 it actually occurred 



Surge Storm-induced component of still-water level 



Tide Astronomical tide 



