Rainfall Simulation Studies of Nutrient Export from Watersheds in Arizona and New Mexico

by Susan Bolton, New Mexico State Univ, United States,
Tim J. Ward, New Mexico State Univ, United States,
Richard A. Cole, New Mexico State Univ, United States,

Document Type: Proceeding Paper

Part of: Watershed Planning and Analysis in Action


Data from rainfall simulation experiments conducted in Arizona and New Mexico were used to identify relationships between total suspended sediment (TSS) concentrations (kg/ha/mm of runoff) in runoff and concentrations (kg/ha/mm of runoff) of total phosphorus (TP) and total volatile suspended sediment (TVSS). Lumping data from five vegetation types yielded the following relationship for total phosphorus: TP = 0.0013* (TSS)** 0.83 with a linear correlation coefficient, r = 0.77. The relationship for total volatile suspended sediment was TVSS = 0.274* (TSS)** 0.72 (r = 0.91). These relationships were validated using data from other experiments and ephemeral channel flow.

Subject Headings: Suspended sediment | Runoff | Rainfall-runoff relationships | Rain water | Phosphorus | Nutrient pollution | Watersheds | United States | Arizona | New Mexico

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