U* (cm/sec) 



20 



30 40 50 60 



MIDFLOW SPEED (cm/sec) 



Measurement 



Assumed Outlier 



Figure 23. Relationship between shear flow and midflow 



speed 



Table 4 

 Values of U* , z , and r 2 as a Function of Midflow Speed V mid 





Midflow 



Shear 



Rep 



resentative 





Speed V mid 



Speed U* 



Bed 



Roughness z 





cm/sec 



cm/sec 





cm 



r 2 



31.1 



1.21 





0.0003 



0.97 



42.0 



2.86 





0.035 



0.91 



45.7 



4.00 





0.13 



0.99 



50.4 



3.38 





0.038 



0.97 



53.6 



3.92 





0.049 



0.97 



56.6* 



2.60 





0.002 



0.93 



60.8 



4.89 





0.088 



0.99 



* Assumed outlier. 



49 



