By John E. Flipse

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The agreement with the simplified description of Figure 10 is evident.  On the other hand, it is possible that the overdredging is not nearly so important as the initial dredging decision in modifying shoaling characteristics in an estuary.  A reduction of the tidal area by sedimentation will reduce the flow area.  This accounts for the instability of many Gulf of Mexico inlets prior to stabilization by jetties and dredging.  ASCE, 95 (WW1): 43–52. Page 3­32 The relationship between entrance area and tidal prism (based on available data) is given by where = area (in ft2), the minimum flow cross­section of the entrance channel (throat) measured below mean A sea level, and P = the tidal prism (in ft3) corresponding to the diurnal range of tide.

River, tidal, or littoral currents can sometimes be directed to help scour the navigational channel, carrying sediments into deeper water outside the dredged area.  Ships' propellers do this very well in some busy channels.  Army Corps of Engineers.  Because of the standby plant costs, the procedure may evolve into periodic dredging, as in normal channel maintenance with floating mobile equipment.  The rate of drift was about 270,000 cy (205,200 m3) per year. Severe erosion prevailed downcoast until the first bypassing arrangement in the country was initiated in the late 1930s.

Page 3­1 3 Considerations Important to Determining Channel Depth Channel Types.  Open channels characterize entrances from the open sea to the port or harbor; confined channels may be canals, dredged estuaries or rivers, or excavated extensions of waterway systems.  Few tide gauges are located in the open waters of major coastal channels.  If the storm surge is caused by hurricane winds, the lowering of atmospheric pressure will cause water levels to rise well above those induced by wind stress alone.

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