by the BEP and the Storm Erosion Studies and because of the many steps 

 required in processing the data, there is a high potential for erroneous or 

 misleading data. To minimize the effect of survey and data transcription 

 errors on computed storm changes (which are especially sensitive to single- 

 or multiple-point errors), all data in the appendixes have been carefully 

 examined for quality and consistency. Obvious errors, such as random 

 "spikes" in elevation, indicative of level-rod reading errors, or long 

 "jumps" in distance caused by taping errors have been removed. Surveys with 

 serious uncorrectable errors such as wider poststorra than prestorm dunes, or 

 surveys that did not close at the landward end have, for the most part, been 

 dropped. Some errors have undoubtedly survived even this careful editing, so 

 caution should be exercised when using data from single profile lines, 

 particularly where an extreme change is shown. 



12. The changes caused by each of the storms are presented in the 

 appendixes, which include cross-sectional plots of the survey data (Figure 2) 

 and tables giving the following parameters which were calculated for each 

 profile line and summarized as follows: 



a. The slope of the foreshore (at msl) of both prestorm and 

 poststorm surveys (negative, seaward sloping). 



b. The change in foreshore slope (negative, steeper slope) . 



c_. The change in msl shoreline position (negative, shoreline 

 retreat) . 



d. Volume change above msl by 0.5-m contour slices (negative, 

 erosion) . 



e^. Total volume change above msl (negative, erosion). 



Note that volume quantities are actually computed cross-sectional areas 

 multiplied by a unit length of beach (1 m) . Foreshore slopes, shoreline 

 positions, and volume changes were computed using the Beach Profile Analysis 

 System (Fleming and DeWall 1982). If required, the position of the shoreline 

 (msl intercept) was extrapolated using the last two survey points but only if 

 the last surveyed point was below an elevation of 0.6 ra. The total volume 

 change above msl was computed only if a msl intercept was computed. Volume 

 change computations were terminated at a maximum elevation of 18 m, a fact 

 that nominally affects a few profile lines on Nauset Beach. 



