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Scientific Investigations Report 2009–5030

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2009–5030

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Table 2. Composition of surface flow-system components during the irrigation season in the DR2 catchment, Yakima River basin, Washington.

[Catchment surface-water outflow: median concentrations measured in DR2 (site W13) from mid-June through mid-September 2004. Base flow: median concentrations measured in DR2 site (W13) from mid-October 2003 through mid-March 2004. Canal: median concentrations measured in Sunnyside Canal (site W15) from mid-June through mid-September 2004. Field drain: median concentrations measured in the field drain (site W42) from mid-June through mid-September 2004. SAF: hypothetical SAF calculated using equation 3. Abbreviations: SAF, seasonal agricultural flow; SiO2, silicon dioxide; m3/s, cubic meter per second; μS/cm, microsiemen per centimeter; mg/L, milligram per liter; na, not applicable]

  Units Catchment
surface-water
outflow
Base flow Canal Field drain SAF
Discharge m3/s 0.204 10.068 na na 0.136
Specific conductance µS/cm 434 657 104 212 321
Nitrate mg/L as N 3.3 5.4 0.22 2.4 2.3
SRP mg/L as P 0.18 0.092 0.029 0.10 0.22
Calcium mg/L 41 64 11 20 29
Magnesium mg/L 14 25 4.2 5.9 9.2
Potassium mg/L 5.4 6.7 1.1 3.3 4.7
Sodium mg/L 25 41 4.7 12 17
Chloride mg/L 11 17 2.1 3.4 7.1
Sulfate mg/L 34 68 3.1 7.6 17
Silica mg/L as SiO2 30 46 14 19 22

1 Median discharge measured in DR2 (site W13) from mid-October 2003 through mid-March 2004, adjusted by the ratio of nonirrigation-to-irrigation season hydraulic gradient from ground water to surface water.

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