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Suspended Solids (mg/l)

Sandusky River

10/1/1999 - 9/30/2004

900 800 700 600 500 400 300 200 100

SS

Total Phosphorus (mg/l)

1.600

1.400

1.200

1.000

0.800

0.600

0.400

0.200

0

0.000

10

100

1000 Flow (cfs)

10000

100000

10

Chloride (mg/l)

Some Examples of Concentration- Flow Curves

140

These graphs illustrate the concentration-flow relationships for three substances in the Sandusky River for a 5-year period. Suspended solids (above) are derived from nonpoint sources. All streams and rivers that we have studied have suspended solids/flow curves with the same general shape as shown above.

120

100

In the Sandusky River, total phosphorus concentration-flow graphs have the same general shape as suspended solids. As noted in Hydrographs, Sedigraphs and Chemographs most of the total phosphorus is particulate phosphorus that is attached to suspended solids particles.

80

60

40

In the Sandusky River, and in most rivers, chloride concentrations decrease with increasing flow. The chloride concentrations present in ground water and point sources is high relative to rainwater. Although rainwater does pick up chloride as it moves across land surfaces, generally its concentration is lower when it reaches streams, so it dilutes the baseflow water. Rainfall and snowmelt runoff following road salt application can result in high chloride concentrations at high flow. This is particularly evident in streams draining urban areas.

20

0

10

Page 2.e.2

Sandusky River

10/1/1999 - 9/30/2004

TP

100

1000 Flow (cfs)

10000

100000

Sandusky River

10/1/1999 - 9/30/2004

Chloride

100

1,000 Flow (cfs)

10,000

100,000

Water Quality Laboratory, Heidelberg College

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