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Scientific Investigations Report 2010–5008

Use of Continuous Monitors and Autosamplers to Predict Unmeasured Water-Quality Constituents in Tributaries of the Tualatin River, Oregon

Table 6. Datasets showing laboratory sample results and summary statistics for scenarios used for calibration and validation of regression models with continuous monitors at Fanno Creek, Durham, Oregon.

[Discharge, turbidity, and specific conductance data were from records at stream gages and continuous monitors. Occasional Clean Water Services samples were collected at higher discharges than shown here, but continuous monitors were not deployed at the time so samples could not be used for this study. Note that USGS uses suspended sediment concentration (SSC) rather than total suspended solids (TSS). SSC and TSS data were combined without adjustment for Scenario 2 and Scenario 3. Abbreviations: FNU, Formazin Nephelometric Unit; n, number of samples (numbers for individual models may vary where missing values or outliers were removed); NWIS, National Water Information System water quality database; USGS, U.S. Geological Survey; ft3/s, cubic foot per second; µS/ cm, microsiemens per centimeter; mg/L, milligram per liter; No./100 mL, colony count per 100 milliliters]

Scenario and summary statistic Calibration Validation
Discharge (ft3/s) Turbidity (FNU) Specific conductance (µS/cm) Total suspended solids (mg/L) Total phosphorus (mg/L) E. coli (No. /100 mL) Total suspended solids (mg/L) Total phosphorus (mg/L) E. coli (No. /100 mL)
Scenario 1 Autosampler (2002–03), n = 54 Clean Water Services ambient monitoring (2001–04), n = 98
Minimum 7.1 5.7 110.0 4.0 0.08 180 2.0 0.08 56
Maximum 134.4 131 245.0 196.0 0.47 10,000 260.0 0.60 12,000
Mean 65.7 47 159.5 51.0 0.19 2,829 16.9 0.15 763
Median 63.9 38 146.0 37.1 0.15 1,300 7.2 0.14 325
Standard deviation 31.0 30 34.7 45.6 0.10 3,174 34.8 0.08 2,020
Scenario 2 Autosampler (2002–03) + USGS NWIS (2001–07), n = 131 Clean Water Services ambient monitoring (2001–04), n = 98
Minimum 1.12 1.4 63.8 0.5 0.08 180 2.0 0.08 56
Maximum 505.0 131 394.0 242.0 0.47 10,000 260.0 0.60 12,000
Mean 49.1 28 187.2 29.9 0.15 2,829 16.9 0.15 763
Median 33.2 17 182.2 12.5 0.14 1,300 7.2 0.14 325
Standard deviation 65.0 29 52.7 40.9 0.07 3,174 34.8 0.08 2,020
Scenario 3 Autosampler peak discharge samples, USGS NWIS high flow 2001–07, Clean Water Services first monthly + high flow, n = 96 Autosampler non-peak discharge samples, USGS non-high flow, Clean Water Services remaining monthly and non-high flow, n = 80
Minimum 1.1 3.9 63.8 2.0 0.08 67 0.5 0.08 56
Maximum 505.0 131 281.0 242.0 0.47 6,300 260.0 0.60 10,000
Mean 57.9 25 177.5 26.3 0.14 824 29.6 0.17 1,565
Median 35.4 17 168.0 13.5 0.13 345 10.0 0.14 520
Standard deviation 80.7 26 48.8 39.4 0.05 1,428 40.7 0.09 2,546

First posted June 18, 2010

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Ave.
Portland, Oregon 97201
http://or.water.usgs.gov

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