where C is the bed elevation. Equation 79 indicates that if more material 

 enters a cell than leaves it, ? will increase (there will be deposition), 

 and if more material leaves than enters, C will decrease (there will be 

 erosion) . Equation 79 is applied in a finite difference form to all the grid 

 cells at the end of each time-step to determine erosion and deposition. Note 

 that an increase in C means a decrease in still-water depth h and vice 

 versa. Therefore, the values of h are updated simultaneously. 



43 



