gage 25 and that at gage 26 cannot be supported. The 9.1-ft model elevation 
is representative of the entire lower Sandy Hook Bay area. The comparison 
at Red Bank can be explained by the omission of wave effect impacts. Winds 
associated with Donna blew straight down the Navesink basin, peaking at 
60 knots just prior to the arrival of the peak surge level. The duration of 
these winds was much shorter than those experienced during the 1962 north- 
easter, and consequently the additional water level due to wave setup and wave 
crest overtopping should be significantly less than that shown in Table 13. 
213. The location of VEP gage 28 (Rumson) is on the south side of the 
entrance to the Shrewsbury basin. As shown in tidal simulations, a signifi- 
cant hydraulie loss occurs across this entrance. Surge plus tide levels in 
the south Navesink basin are approximately 7.5 ft. With a loss across the 
entrance and southerly winds blowing, it seems highly unlikely that water 
levels could reach 10.4 ft as reported by VEP. 
214. To make an additional check on the accuracy of using Sandy Hook 
data to drive the nearshore model and to add confidence to the augmented JPM 
curve developed for Sandy Hook, a comparison of the Sandy Hook stage-frequency 
curve with historical data was made. The comparison, presented in Figure 61, 
confirms that procedures used in the JPM process and boundary condition data 
are appropriate. 
Simulation of Storms 
215. Two sets of 20 hurricanes each were simulated on a Cyber 205 com- 
puter using the calibrated and verified storm surge model. Boundary condi- 
tions for each surge plus tide event were generated from the FIMP data base. 
The time from the start of hurricane simulation to the time of landfall was 
computed within WIFM based on the ratio of RM to FS. Faster moving storms 
require less time for simulation than do slower ones, and hurricanes with 
large spatial extent require more execution time than smaller storms. The 
fastest storm was simulated for 18 hr, beginning 12 hr before landfall and 
ending 6 hr after. For the slowest storm, the simulation was initiated 24 hr 
before landfall and continued for 10 hr afterward, for a total of 34 hr. For 
each of the 40 surge hurricane plus tide event time-histories, all maximum 
still-water levels greater than 6.5 ft NGVD were included in the development 
of the stage-frequency curves. A time step of 60 sec was used for lower 
123 
