will underpredict the transport rate. Predictions based upon wave data rely on an 

 imperfect understanding of the relationship of wave energy flux and longshore 

 transport rate. 



At the Colorado River, it is clear that the impoundment basin and channel are 

 not functioning as a total sink. This is observed in the pattern of sediment 

 deposition shown in Figure 27. Thus, the wave-based transport rates presented 

 by Heilman (1995) and in this report (gross transport in the range of 600,000 to 

 700,000 cubic meters/year and net transport in the range of 300,000 to 

 500,000 cubic meters/year) are consistent with the impoundment basin data, and 

 are the best available estimates of longshore transport at this location. 



52 



Chapter 5 Prediction of Sediment Transport Rates 



