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Indiana Real-time Water Quality


NRTWQ Home >> Indiana >> Constituents

Constituents Measured or Computed Continuously in Indiana

Continuous measurements of constituents (water-quality parameters) can be obtained by direct measurement using sensors, or by indirect computation using models.

Below is a list of constituents continuously measured or computed by the USGS in Indiana. Click on a constituent for more detailed information, including a list of where it is measured or computed.

Constituent Name Units Criteria
Computed discharge cubic feet per second (cfs)
Dissolved oxygen milligrams per liter (mg/L)
Gage height feet (ft)
Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen milligrams per liter as N (mg/L as N)
pH standard units (std units)
Specific conductance at 25 degrees Celsius microsiemens per centimeter (uS/cm)
Suspended sediment concentration, water, unfiltered, estimated by regression equation milligrams per liter (mg/L)
Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined milligrams per liter (mg/L)
Total nitrogen, water, filtered, estimated by regression equation, milligrams per liter milligrams per liter as nitrogen (mg/L-N)
Total phosphorus milligrams per liter (mg/L)
Total phosphorus milligrams per liter as phosphorus (mg/L-P)
Turbidity, measured as NTU or FNU formazin nephelometric units (FNU)
Water temperature degrees Celsius (°C)