Table 14 (Concluded) 
Flood* WIFM 
Point* Grid Cell Mark Max. Water Elev. 
No. Location* (Y,X) (iit) (ft) 
28 Rumson - Inter- (17,29) 10.4 6.9 
section of 
Waterman Ave. 
& Grant Ave. 
29 Red Bank - Marine (15, 6) 8.6 Uoit 
Park, at Bulkhead 
30 Red Bank - Marine (155) 6) 9.8 est 
Park, at Bulkhead 
and reported water levels at locations 33, 34, and 35 for the 1962 storm and 
locations 26 and 29 for Hurricane Donna. 
211. Model results at Red Bank and Little Silver, in the upper reaches 
of the Navesink and Shrewsbury basins, respectively, are typically much lower 
than observed water levels. These areas are susceptible to significant in- 
creases in water level due to wave setup and wave crest overtopping. As de- 
scribed above, wave setup is not included in model calculations and is consi- 
dered insignificant in most of the modeled area. To include these effects, 
procedures similar to those used in the FIMP study were adopted. These proce- 
dures reflect the physical principles involved, but are greatly simplified. 
The maximum wave setup is shown to be 0.15 times the significant wave height. 
Maximum significant wave heights for the gages in question are approximately 7 
and 6 ft, respectively, resulting in wave setups of 1.0 and 0.9 ft. An effec- 
tive flood elevation, or wave crest elevation, can be expressed as the surge 
plus tide plus wave setup elevation plus an additional 0.5 times the signifi- 
cant wave height. This calculation allows a total maximum water level of 4.5 
and 3.9 ft above the model surge level at Red Bank and Little Silver, respec- 
tively. The reader is cautioned to interpret the results with care. These 
additional levels represent a maximum wave effect occurring at the peak surge 
plus tide level. However, the difference noted between observed and calcu- 
lated results is expected since additional water level due to wave effects is 
not included in the model. 
212. Results for the Highland area (near VEP gage points 25 and 26) 
are good for Hurricane Donna. The 2-ft discrepancy between the flood mark at 
122 
