(b) The removal of large deposits of sand from Fire Island 

 Inlet for beach restoration projects will not adversely affect 

 the functioning of plan 3A. 



(c) Extension to the existing sand dike will not improve 

 the fiinctioning of plan 3A in channel shoaling or deposition 

 patterns. Likewise, construction of a dike at Cedar Island 

 Beach would not in^jrove the functioning of plan 3A. 



(d) A deflector dike parallel to the entrance channel would 

 not improve the functioning of plan 3A from either shoaling of 

 the navigation channel or deposition patterns; further the dike 

 would be extremely difficult to maintain. 



(e) Extension of the Federal jetty would not reduce channel 

 shoaling or improve deposition patterns observed for plan 3A. An 

 extension to the jetty would reduce channel shoaling on a tempo- 

 rary basis while the impounding capacity of the extended jetty 

 was being filled; shoaling rates and deposition patterns would 

 then be the same as for plan 3A. Material impounded by a jetty 

 extension would also be permanently lost as a source of beach 

 nourishment. 



(f) Extension of the Federal jetty, as a combination low 

 weir inner section and high outer section, did not function as 

 intended. Instead of moving readily over the low weir section, 

 a large percentage of the littoral drift was trapped to the east 

 of the jetty extension; it appeared that the weir section would 

 be blocked and thus be rendered completely inoperative. 



(g) An offshore breakwater and littoral trap would also sat- 

 isfy all the necessary requirements of a plan for channel stabi- 

 lization and sand bypassing at Fire Island Inlet. 



Representative tidal elevations for plan 3A are shown in Figure 7-13; 

 the effect of plan 3A on current velocities at typical locations is shown 

 in Figure 7-14. A scour and fill map for plan 3A after 2 years of proto- 

 type operation is shown in Figure 7-15. Thus, it was determined that 

 dredging must be performed approximately every 2 years. 



d. Improvement of Navigation Channel--Galveston Bay and Harbor 

 Entrance Channel, Texas. 



(1) Projects . Stabilization of jetty channel; north jetty pro- 

 tection; investigation of shoaling characteristics between jetties; and 

 location of anchorage area. 



(2) References . Simmons and Boland (1969); Letter and McAnally 

 (1977). 



(3) Laboratory . WES. 



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