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- 
- Dredging operations in a river yield la 
-      rge volumes of sediments whose sma 
-      llest particle is measured to be c 
-      oarse sand with a diameter of 4 mi 
-      crons and whose largest particle i 
-      s coarse sand with a diameter of 1 
-      000 microns or 1mm.determine the s 
-      ettling velocity for each size cla 
-      ss.Gw=9764 N/m^3;Ssand=2.65;Sclay= 
-      1.6;and the viscosity at 30 degree 
-       celsius is 0.8*10D-3 N.s/m^2      
- 
- Solution:   
- 
- (i)For clay particles:   
- 
- Assuming reynolds number less than 1   
- 
- R1=   
- 
-    3.255D-08  
- 
- Since reynolds number is less than 1,he 
-      nce                                
- 
- Settling velocity for clay particles   
- 
-    0.0000065  
- 
- m/s   
- 
- (ii)For sand particles:   
- 
- Assuming reynolds number greater than 1 
-       and equal to 220 Cd=0.7           
- 
- R2   
- 
-    219.41569  
- 
- Since the reynolds number is greater th 
-      an 1                               
- 
- Hence the settling velovity =   
- 
-    0.1755325  
- 
- m/s