WSP10284

• File Number: 8170
• Description: Arkansas Basin Water Quality Issues
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 1/1/1998
• Author: USGS
• Title: Water-Quality Assessment of the Arkansas River Basin - Southeastern Colorado - 1990-93
• Water Supply Pro - Doc Type: Report/Study

Manganese

Dissolved-manganese concentrations were
largest during the early-snowmelt-runoff streamflow
regime; the maximum median concentration of
280 l'g/L occurred at Malta (fig. 13). Dissolved-

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manganese concentrations were largest in the early-
snowmelt-runoff regime probably because, in April,
early snowmelt flushed the mines and mine tailings.
Additionally, there was relatively little sediment in the
water column for the manganese to sorb onto and

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EXPLANATION

EARLY-SNOWMELT RUNOFF IAp"l) . _ . . . POST-SNOWMELT RUNOFF (July-Septembor)

SNOWMELT RUNOFF (May--oJune) _ . _ LOW FLOW (October-March)

Figure 13. Median dissolved- and total-recoverable manganese concentrations by streamflow regime in the upper
Arkansas River, April 199O-March 1993.

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30 Water-Quality Assassment 01 tha Arkansas Rlvar Basin, Southeastern Colorado, 199~3