c. Bed load replenishment rate should be considered in site selec- 

 tion if the life span of the site is to cover several consec- 

 utive years, even if there will be inactive periods. Glacial 

 and mountain origin rivers, particularly near headwaters, have 

 potentially higher replenishment rates than rivers originating 

 in foothills or coastal plains. 



d. Projects requiring large gravel quantities (roughly 50,000 m 

 or more), should consider the following: 



• Scraping of unvegetated, mid-channel bars and lateral bars 

 in braided rivers, and medium and large split channel 

 rivers. This recommendation should be followed as long as 

 suitable buffers (see Section V A 3 and Appendix A) can be 

 ma i nta i ned, 



• Pit excavation in terraces or inactive floodplains, as long 

 as sufficient buffer is maintained between the pit and the 

 act i ve f I oodp lain 



e. Projects requiring less than 50,000 m should consider: 



• Scraping unvegetated mid-channel and lateral bars in braided 

 rivers and large and medium split channel rivers; this recom- 

 mendation should be followed as long as suitable buffers can 

 be ma i nta i ned 



• Scraping point bars of large and medium meandering rivers 



• Scraping in terraces or inactive floodplains 



C. VERIFICATION OF SITE ACCEPTABILITY 



Before proceeding with SITE PLANNING, review the selected site on the 

 basis of the entire Guidelines Manual. Give special attention to the 



15 



I. IDENTIFICATION OF SUITABLE SITES 



