When the sill elevation, z g , is not zero, Figure 4 is used to correct 

 the P value. 



0.15 i- 



0.10 



0.05 



Pc-P 



-0.05 



-0.10 



*« --aJZ 



/ 



z.--o«/4 



,v/ 



-f 



/ 



z,=0 



\ 



.y 



0.4 



0.6 



0.8 



\ 



■n \ 



* 



Figure 4. Graph to correct P (see Fig. 3) when sill elevation is not 

 zero. P is part of the sediment mass deposited in the basin 

 when sill elevation is included; k = (see eq. 2). 



If the concentration of suspended sediment entering the basin is time- 

 varying (i.e., k f 0), an additional correction, K^, must be made (Fig. 5) 

 when 0.2 < P s < 0.8. The part of the sediment which is deposited in the 

 harbor, P s k» when the sill elevation and time-variable inflowing sediment 

 concentration are considered, is 



P sb = K b(^- l) + .* e 



(6) 



Figure 5. Correction factor, K-, for time variations in the suspended 

 concentration of sediment entering the basin (used with eq. 6). 



12 



