Rearranging equation (3-63a) , 



AP = 



AP = 



1 



14.5 



14.5 



"max 



0.447 



+ R(0.31f) 



^^ + (62.04)(0.31)(0.337) ' ^ 



']] 



AP = 61.16 mm Hg 



b. Estimate of Storm Surge . Bretschneider (1959) gives an empirical 

 relationship between maximum sustained windspeed and surge height (both 

 pressure- and wind-induced) at the Delaware Bay entrance (applicable only to 

 Delaware Bay). Equation 11 from this reference is used for peak surge (S^) 

 computations : 



S^ = 0.0001 U^^ ± 10% (U/^ in km/hr) 



Hurricane A (eq. 3-62) 



U^ = 0.865 Mj,^ + 0.5 V^ 



U^ = 0.865 (163.98) + 0.5 (46.3) 

 U^ = 165 km/hr 



[^o]mxx = 0-0001 (Ufl) = 2.72 m 

 say [^o)max = 2.75 ± 0.25 m 

 Hurricane B 



[^o)max = 0.0001 (172)^ = 2.96 m 

 say [^o)mxx = 3.00 m ± 0.25 m 



Final results of storm surge estimates from the empirical equation of 

 Bretschneider (1959): 



Hurricane A ^^o)mxx ~ 2.75 ± 0.25 m 



Hurricane B {^o)max = 3.00 ± 0.25 m 



c. Observed Water Level Data, Breakwater Harbor, Lewes, Delaware 

 (National Ocean Service (NOS) Tide Tables) (see Ch. 3, Sec. VIII and Table 

 3-3) . 



(1) Length of record: 1936 to 1973 



(2) Mean tidal range: 1.25 m 



8-9 



