Nutrients, Suspended Sediment, and Pesticides in Streams and Irrigation Systemsin the Central Columbia Plateau in Washington and Idaho, 1959-1991 (Revised)

摘要

This report provides an initial analysis of nutrient, suspended-sediment, andpesticide concentration data collected from 1959-1991 in the Central Columbia Plateau study unit. The purposes of this report are to (1) identify the spatial and temporal patterns of concentrations and loads of nutrients, suspended sediment, and pesticides within the Central Columbia Plateau study unit, (2) use existing water-quality data to guide additional data collection in the study unit, (3) contribute to a synthesized description of the status and trends in the quality of the Nation's water resources, (4) document findings for future NAWQA activities in the Central Columbia Plateau study unit, and (5) present a preliminary conceptual model of the spatial and temporal patterns of concentrations and loads of suspended sediment, nutrients, and pesticides within the study area, based on the available data and the time frame allotted for analysis.