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Suspended-Sediment Concentrations during Dam Decommissioning in the Elwha River, Washington

Prepared in cooperation with the U.S. Environmental Protection Agency and the National Park Service

By Christopher A. Curran, Christopher S. Magirl, and Jeffrey J. Duda

Table 1. Statistical summary of model-calibration dataset for U.S. Geological Survey water-quality monitoring station on the Elwha River at Diversion, near Port Angeles (12046260), Washington, September 2011– September 2013.

[mg/L, milligrams per liter; FNU, Formazin Nephelometric Units]

Summary
statistic
Calibration dataset (23 samples) Time-series dataset (15-min values)
Suspended-
sediment
concentration
(mg/L)
Fine suspended-
sediment
concentration
(mg/L)
Turbidity
(FNU)
Suspended-
sediment
concentration
(mg/L)
Fine suspended-
sediment
concentration
(mg/L)
Turbidity
(FNU)
Minimum76354531
Maximum11,6004,9701,490>5,700>2,900>1,200
Mean3,4601,810760>1,060>586>384
Median1,5401,450943278199246
Standard deviation3,7301,820545>1,600>801>359