Evaluation of Historical Sediment Deposition 



Timber Harvest 



1990 



«Insert Figure B-l.» 



(5 Yr cumulative amortized acreage) 



1000 2000 3000 4000 5000 



1980 



Flood— 



1970- 



Flood— 



I960- 



1860 



^^3=— 



Whitefish Lake 



100 200 300 



Mean Sedimentation Rate 

 ,2 



(mg/cm^/yr) 



Figure B-1. Mean sediment accumulation rates in Whitefish Lake over the last 

 125 years, and timber harvest activity over the time period (since 1929) 

 when harvest records could be assembled. This latter activity is expressed as a 

 5 year cumulative acreage, with previous 4 years acreages amortized using the 

 Flathead National Forest new road sediment delivery coefficients. 



Page 22 



Flathead Basin Cooperative Program Final Report 



