Table S2.

Descriptive statistics of physical, chemical, and hydrologic variables measured during baseflow conditions at 64 rivers

ParameterCountMinimumMeanMaximumSD5th percentile95th percentile
Ammonia, µg⋅L−1630.023.6280.045.60.098.5
Calcium, mg⋅L−16330.062.4160.621.633.898.2
Chlorine (Cl), mg⋅L−1633.442.3291.854.45.9174.8
Dissolved oxygen, mg⋅L−1645.99.813.31.77.212.2
Dissolved organic carbon (NPOC), mg⋅L−1631.66.126.84.22.115.6
Magnesium, mg⋅L−1637.018.434.26.310.329.1
Nitrate/nitrite (NOx), µg⋅L−1640.0858.35,638.91,310.30.04,095.6
Pheophytin corrected chlorophyll a, µg⋅L−1590.00.84.41.00.13.4
pH637.98.28.40.18.08.4
Potassium, mg⋅L−1630.42.29.81.90.56.0
Sodium, mg⋅L−1633.027.0199.336.93.4113.0
Soil hydraulic conductivity (Ksat), m⋅d−1640.52.24.71.10.64.2
Specific conductance, μS⋅cm−163257.0527.01,589.0264.2265.21,039.8
Soluble reactive P, µg⋅L−1640.923.3266.045.02.187.0
Sulfate, µg⋅L−1632.432.1169.830.55.689.6
Total dissolved N, µg⋅L−1640.01,423.36,033.71,346.5337.65,414.1
Total dissolved P, µg⋅L−1643.125.2292.338.63.958.0
Total N, µg⋅L−16481.81,082.15,583.11,129.3110.83,610.6
Total P, µg⋅L−1647.737.8395.552.48.9102.5
Total chlorophyll a, µg⋅L−1590.11.67.81.90.27.4
Precipitation, mm
 6 h640.00.19.21.2
 12 h640.01.977.910.20.07.9
 18 h640.03.478.611.60.030.8
 24 h640.04.478.611.90.031.0
 2 d640.06.078.611.90.031.0
 3 d640.07.780.113.70.034.2
 4 d640.08.380.513.50.034.2
 6 d640.09.087.314.10.034.2
 8 d640.011.692.616.50.057.2
Discharge, m3⋅s−1630.06.757.312.50.043.4
Water temperature, °C647.013.117.52.68.216.6
  • Precipitation measured at hourly averages from 16-km2 NEXRAD cells and reported in cumulative millimeters per time.