• The upper level of the low-flow buffer. This is defined 

 in Site Preparation Guidelines (V A 5a) 



• The level corresponding to 0.15 m above the average water 

 level expected during the gravel removal operation 



• The level that will maintain a specified averaye maximum 

 depth in the channel (Figure 15). Recommended values and 

 minimum values of maximum depth that should be maintained 

 are listed below for three channel width ranges at channel- 

 full flow. Values of half the recommended depths should be 

 considered minimum depths below which hydraulic change is 

 more likely to occur. 



Braided Configuration 



Channel-ful I Recommended 



width maximum depth 



(m) (m) 



0-5 0.50 



5-50 0.50 



50 or greater I .00 



Split, Meandering, Sinuous, and Straight Configurations 



Channel-full Recommended 



width maximum depth 



(m) (m) 



0-5 0.50 



5-50 I .00 



50 or greater I .50 



67 



VI . SITE OPERATION 



