channel wa.s -17.2 feet MSL for its entire length. The depth of the plan 

 4 inlet was also -17.2 feet MSL for its entire length, and the alinement 

 was identical to that of plan 2. 



(8) Test Procedures . The New York Harbor model is an estuarine 

 model operated with saltwater. The new model of the proposed inlet was 

 operated with freshwater because the required information was independent 

 of salinity effects. 



The plan 1 inlet (Fig. 7-5) described in the authorizing document, 

 was first modeled to an undistorted scale of 1:100, and steady-state 

 tests were made for both flood and ebb flows over the full range of head 

 differentials and water surface elevations to be expected during later 

 tests. From these test results, the discharge through the inlet as a 

 function of head differential and water surface elevation was determined, 

 and these data provided a basis for calibration of the inlet. The plan 1 

 inlet was then constructed in the distorted-scale New York Harbor model, 

 and the calibration data described above were used to adjust the hydrau- 

 lic resistance of the inlet so that both flood and ebb discharges were 

 reproduced accurately over the full range of head differentials and water 

 surface elevations to be encountered during actual tests. 



Tests were conducted in the New York Harbor model to determine the 

 effects of the plan 1 inlet on normal tides, tidal current directions and 

 velocities, salinities, and the dispersion of dye tracers from simulated 

 pollution sources in Raritan Bay, Upper New York Bay, and the Shrewsbury 

 and Navesink Rivers (Fig. 7-5). The test results suggested that plan 1 

 should be modified in the interest of improving flow conditions at the 

 bay end of the inlet, and possibly in improving shoaling characteristics. 

 Consequently, plans 2, 3, and 4 were devised. Each plan was calibrated 

 in the undistorted-scale model of the new inlet and then reproduced in 

 the New York Harbor model. All four plans were subjected to the above- 

 mentioned series of tests; plan 3 was selected as the optimum inlet plan 

 on the basis of these tests. 



Plan 3 was tested in the New York Harbor model to determine effects 

 on the temperature regime of Sandy Hook Bay and the Shrewsbury and Nave- 

 sink Rivers. Tests were also conducted to determine the effects on flood- 

 ing for conditions of the November 1950 hurricane surge. Finally, tests 

 were made with plan 3 in the undistorted-scale model to determine the 

 optimum location of the jetties, the wave climate between and adjacent 

 to the jetties during storm wave action in the ocean, and the transmis- 

 sion of wave action through the inlet and its effects on the Highlands 

 Marina shoreline. 



(9) Summary of Test Results . Three jetty plan locations were 

 tested in the model of the new inlet (Fig. 7-6). Comparison of the test 

 results shows that jetty plan C produces the most desirable tidal flow 

 conditions. The high currents which attacked the end of the south jetty 

 in jetty plan A are minimized in jetty plan C; eddies which developed 



486 



