Trend analysis of selected water-quality constituents in the Verde River Basin, central Arizona

Book · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6762757

Baldys, S ^[1]

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1. Geological Survey, Tucson, AZ (United States)

Temporal trends of eight water quality constituents at six data collection sites in the Verde River basin in central Arizona were investigated using seasonal Kendall tau and ordinary least-squares regression methods of analysis. The constituents are dissolved solids, dissolved sulfate, dissolved arsenic, total phosphorus, pH, total nitrite plus nitrate-nitrogen, dissolved iron, and fecal coliform bacteria. Increasing trends with time in dissolved-solids concentrations of 7 to 8 mg/L/yr at Verde River near Camp Verde were found at significant level. An increasing trend in dissolved-sulfate concentrations of 3.59 mg/L/yr was also found at Verde River near Camp Verde, although at nonsignificant levels. Statistically significant decreasing trends with time in dissolved-solids and dissolved-sulfate concentrations were found at Verde River above Horseshoe Reservoir, which is downstream from Verde River near Camp Verde. Observed trends in the other constituents do not indicate the emergence of water quality problems in the Verde River basin. Analysis of the eight water quality constituents generally indicate nonvarying concentration levels after adjustment for seasonality and streamflow were made.

• OSTI ID: 6762757
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ARIZONA
ARSENIC
DEVELOPED COUNTRIES
ECOLOGICAL CONCENTRATION
ELEMENTS
FEDERAL REGION IX
IRON
LEAST SQUARE FIT
MAXIMUM-LIKELIHOOD FIT
METALS
MONITORING
NITRATES
NITRITES
NITROGEN COMPOUNDS
NORTH AMERICA
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLLUTION
REGIONAL ANALYSIS
RIVERS
SEASONAL VARIATIONS
SEMIMETALS
STREAMS
SULFATES
SULFUR COMPOUNDS
SURFACE WATERS
TRANSITION ELEMENTS
USA
VARIATIONS
WATER POLLUTION