nearby bridges, culverts, villages, and other material sites. The latter 

 case is significant in the application of these guidelines. On large proj- 

 ects it is sometimes necessary to locate a series of material sites in close 

 proximity along the floodplain of a river. The effects of multiple material 

 sites in a floodplain were not evaluated in this study. Hence the appli- 

 cation of these guidelines to multiple site projects must recognize this 

 shor tcomi ng . 



The user should be thoroughly familiar with the contents of the Techni- 

 cal Report to give perspective to the guidelines for their effective use. 

 THE GUIDELINES ARE DESIGNED TO DIRECT THE PROCESS OF IDENTIFYING, PLANNING, 

 PREPARING, OPERATING, AND CLOSING MATERIAL SITES; THEY ARE NOT MEANT TO BE 

 USED AS STIPULATIONS TO BE USED IN EACH AND EVERY CASE . 



It is essential that the user of these guidelines consider each materi- 

 al site individually. Identification of unique characteristics may require 

 that certain guidelines be ignored or interpreted differently, or different 

 combinations of guidelines be considered. This manual is intended for use by 

 all individuals interested in floodplain gravel removal. 



GRAVEL REMOVAL METHODS AND CLASSIFICATION 



A variety of gravel removal methods and river characteristics are 

 covered by this manual. In general, these methods and river characteristics 

 consi st of : 



1. Scraping exposed or vegetated gravel from active and inactive flood- 

 plain and terrace deposits. Scraping usually does not involve work- 

 ing in active channels. 



2. Pit excavation of vegetated gravel deposits located in inactive 

 floodplains and terraces. 



3. Dredging from the bed of active channels of large and medium-sized 

 r i vers. 



