between the navigation channel and both jetties for jetty plan B did not 

 occur with jetty plan C. Therefore it appears that the jetty alinements 

 and spacings for jetty plan C would result in a satisfactory distribution 

 of flow through the inlet. 



The results of the tests to define wave conditions in the Highlands 

 Marina area showed that waves generated in the Atlantic Ocean and propa- 

 gated through the inlet are dissipated in Sandy Hook Bay to such an ex- 

 tent that essentially no wave energy reaches the Highlands Marina area. 

 The maximum wave height recorded during these tests was 0.3 foot, well 

 below wave heights resulting from waves generated within Sandy Hook Bay. 

 Thus, it appears certain that energy passing through the inlet from waves 

 generated in the Atlantic Ocean will not significantly affect wave condi- 

 tions in the Highlands Marina area. 



The results of tests to define wave conditions in and near the inlet 

 showed that the maximiom increase in wave height occurred with an ebb flow 

 approximately 40 percent of the maximum spring tide ebb flow. Increases 

 in wave heights of 60 to 70 percent, as compared to wave heights measured 

 about 600 feet oceanward from the ends of the jetties, were observed just 

 inside the ends of the jetties. Significant increases in wave heights be- 

 tween the jetties were not observed for tests with flood currents or for 

 high water slack conditions. The alinement of the primary wave was gen- 

 erally perpendicular to the centerline of the navigation channel during 

 all tests. Wave conditions within the inlet apparently would not cause 

 significant navigation problems except possibly for certain ocean wave 

 conditions combined with a critical ebb discharge in the inlet. 



Conclusions based on test results in the undistorted-scale model and 

 in the New York Harbor model, relative to Shrewsbury Inlet were: 



(a) None of the plans tested would have significant effects 

 on water surface elevations during normal tides or during hurri- 

 cane surges. 



(b) Current velocities and flow patterns would not change 

 appreciably except in the immediate vicinity of the inlet. 



(c) Current velocities in the new inlet for normal tides 

 should not be excessive for safe navigation. 



(d) None of the plans tested offered a unique advantage 

 over the other plans in relation to the crosscurrents during 

 certain periods of the tide phase; however, the alinement of 

 plans 1 and 3 appeared to be better than that of plans 2 and 4. 



(e) For pollution sources in Raritan Bay, the influx of 

 pollution into Sandy Hook Bay, Shrewsbury River, and Navesink 

 River would be reduced slightly. 



(f) For pollution sources in Upper New York Bay, the in- 

 flux of pollutants to Sandy Hook Bay and the Shrewsbury and 

 Navesink Rivers would be increased. 



