PART VI: RECOMMENDATIONS 



Advance Maintenance Dredging 



130. The following recommendations on advance maintenance dredging are 

 based not only on Plan 1 results from Model B but also on all other available 

 information such as field surveys and field experience. It must be emphasized 

 that these recommendations are for an average year including normal storms and 

 do not allow for the effects of abnormal storms such as hurricanes and tropi- 

 cal storms. Since the Navy wants a minimum clear depth of 46 ft mlw always 

 and since it plans to dredge the channel only once a year, the deposition 

 rates by zones as well as the deposition rates predicted by Model B for indi- 

 vidual cells (Figure 29) have been taken into account in making these 

 recommendations . 



-150 -100 -50 50 100 150 200 250 300 350 400 



DISTANCE, 100 FT 



Figure 29. Comparison of computed erosion/deposition rates by cells for 



base and Plan 1 



131. For reasons previously mentioned, the high local deposition rates 

 predicted by Model B for base and Plan 1 in some reaches of the channel be- 

 tween sta 325+00 and sta 399+74 are suspect because up-to-date bathymetric 

 data were not available for model calculations and there are no corroborating 

 field data for such high rates. On the other hand, field surveys taken in 

 April 1984 and December 1984 which covered the channel between these stations 



77 



