EFFECTS OF GRAVEL REMOVAL ON WATER QUALITY 

 L. L. Moulton 



INTRODUCTION 



Water quality parameters were measured in conjunction with the aquatic 

 biological studies at the 25 gravel removal sites. Since the sites were visit- 

 ed from 2 to 20 years after gravel removal had been completed, the results of 

 the monitoring program reflect only long-term effects on water quality con- 

 ditions. The sites selected for study represented a broad range of Physical 

 Site Characteristics and Gravel Removal Area Characteristics, which are des- 

 cribed in the Major Variable Matrix (Table I). Instruments and procedures 

 used are described in APPROACH AND METHODOLOGY. Changes in water quality 

 during gravel extraction were not measured because active gravel removal sites 

 were not available for study. A review of available information on this aspect 

 was included in an earlier report (Woodward-Clyde Consultants 1976). 



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