This article is a US Government work and is in the public domain in the USA.
The behaviour of 39 pesticides in surface waters as a function of scale†
Version of Record online: 25 MAY 2001
This article is a US Government work and is in the public domain in the USA. Published in 2001 by John Wiley & Sons, Ltd.
Special Issue: Water Quality of Large US Rivers: Results from the US Geological Survey's National Stream Quality Accounting Network
Volume 15, Issue 7, pages 1251–1269, May 2001
How to Cite
Capel, P. D., Larson, S. J. and Winterstein, T. A. (2001), The behaviour of 39 pesticides in surface waters as a function of scale. Hydrol. Process., 15: 1251–1269. doi: 10.1002/hyp.212
- Issue online: 25 MAY 2001
- Version of Record online: 25 MAY 2001
- Manuscript Accepted: 15 MAY 2000
- Manuscript Received: 1 DEC 1999
- USGS NASQAN.
- USGS NAWQA
- surface water
A portion of applied pesticides runs off agricultural fields and is transported through surface waters. In this study, the behaviour of 39 pesticides is examined as a function of scale across 14 orders of magnitude from the field to the ocean. Data on pesticide loads in streams from two US Geological Survey programs were combined with literature data from field and watershed studies. The annual load as percent of use (LAPU) was quantified for each of the fields and watersheds and was used as the normalization factor across watersheds and compounds. The in-stream losses of each pesticide were estimated for a model stream with a 15 day travel time (similar in characteristics to the upper Mississippi River). These estimated in-stream losses agreed well with the observed changes in apparent LAPU values as a function of watershed area. In general, herbicides applied to the soil surface had the greatest LAPU values and minimal in-stream losses. Soil-incorporated herbicides had smaller LAPU values and substantial in-stream losses. Insecticides generally had LAPU values similar to the incorporated herbicides, but had more variation in their in-stream losses. On the basis of the LAPU values of the 39 pesticides as a function of watershed area, a generalized conceptual model of the movement of pesticides from the field to the ocean is suggested. The importance of considering both field runoff and in-stream losses is discussed in relation to interpreting monitoring data and making regulatory decisions. Published in 2001 by John Wiley & Sons, Ltd.