SCALES 



1000 2000 3000 FT 



500 1000 METERS 



Existing Contour Lines 



IDEALIZED NO-INLET 

 CONTOUR LINES 

 CONtOURS IN FEET 



Ocean 



K-^^Va^-;.v.^-;^ 



(AFTER DEAN AND WALTON, 1973) 



Procedure 



1. Construct idealized no-inlet contour lines. 



2. Impose square grid system on chart and calculate 

 differences between actual depth and idealized no- 

 inlet depth at grid line intersections. 



3. Average depth differences at intersections and record 

 in center of block. 



4. Compute volume of sand in outer shoal by suimning 

 averaged block, depth differences, and multiply by area 

 of single grid block. 



Figure 4-84. Steps in calculation of accumulated volume of sand in the 

 outer bar for an idealized inlet. 



4-175 



