Journal ArticleDOI
Groundwater as a nonpoint source of atrazine and deethylatrazine in a river during base flow conditions
Reads0
Chats0
TLDR
In this article, alluvial groundwater adjacent to the main stem river is the principal nonpoint source of atrazine and deethylatrazine in the Cedar River of Iowa after the river has been in base flow conditions for 5 days.Abstract:
Alluvial groundwater adjacent to the main stem river is the principal nonpoint source of atrazine and deethylatrazine in the Cedar River of Iowa after the river has been in base flow conditions for 5 days. Between two sites along a 116-km reach of the Cedar River, tributaries contributed about 25% of the increase in the atrazine and deethylatrazine load, whereas groundwater from the alluvial aquifer contributed at least 75% of the increase in load. Within the study area, tributaries aggregate almost all of the discharge from tile drains, and yet the tributaries still only contribute 25% of the increase in loads in the main stem river. At an unfamned study site adjacent to the Cedar River, the sources of atrazine and deethylatrazine in the alluvial groundwater are bank storage of river water and groundwater recharge from areas distant from the river. Atrazine and deethylatrazine associated with bank storage water will provide larger concentrations to the river during early base flow conditions. After the depletion of bank storage, stable and smaller concentrations of atrazine and deethylatrazine, originating from groundwater recharge, continue to be discharged from the alluvial aquifer to the river; thus these results indicate that alluvial aquifers are an important nonpoint source of atrazine and deethylatrazine in rivers during base flow.read more
Citations
More filters
Journal ArticleDOI
Relation of streams, lakes, and wetlands to groundwater flow systems
TL;DR: The superposition of local flow systems associated with surface-water bodies on this regional framework results in complex interactions between groundwater and surface water in all landscapes, regardless of regional topographic position as mentioned in this paper.
OtherDOI
Pesticides in the Nation's Streams and Ground Water, 1992-2001
Robert J. Gilliom,Jack E. Barbash,Charles G. Crawford,Pixie A. Hamilton,Jeffrey D. Martin,Naomi Nakagaki,Lisa H. Nowell,Jonathan C. Scott,Paul E. Stackelberg,Gail P. Thelin,David M. Wolock +10 more
TL;DR: Water samples collected from 1992 through 2001 from 186 streams and rivers and from 5,047 wells in 51 of the nation's major river basins and aquifer systems were summarized to provide the most comprehensive national-scale analysis of pesticide occurrence to date as discussed by the authors.
Journal ArticleDOI
Evaluating the Reliability of the Stream Tracer Approach to Characterize Stream‐Subsurface Water Exchange
TL;DR: In this article, the authors evaluated the reliability of the stream tracer approach to characterize hyporheic exchange in St. Kevin Gulch, a Rocky Mountain stream in Colorado contaminated by acid mine drainage.
Book ChapterDOI
1 – Quantifying Hydrologic Interactions between Streams and Their Subsurface Hyporheic Zones
Judson W. Harvey,Brian J. Wagner +1 more
Journal ArticleDOI
Human Impacts on the Stream–Groundwater Exchange Zone
TL;DR: This review focuses on the direct and indirect effects of human activity on ecosystem functions of the hyporheic zone, which lies between two heavily exploited freshwater resources and is vulnerable to impacts coming to it through both of these habitats.
References
More filters
Journal ArticleDOI
Carbon and nitrogen determinations of carbonate‐containing solids1
John I. Hedges,Jeffrey H. Stern +1 more
TL;DR: In this paper, two methods for determination of organic carbon, inorganic carbon, and total nitrogen in sediments, sediment trap materials, and plankton are described, using an automated CHN analyzer for all elemental determinations.
Journal ArticleDOI
Transport of nonpolar organic compounds from surface water to groundwater. Laboratory sorption studies
Journal ArticleDOI
Organic Pollutant Sorption in Aquatic Systems
TL;DR: Sorption partition coefficients, indexed to organic carbon (Koc), are relatively invariant for natural sorbents as mentioned in this paper, and they can be estimated from other physical properties of pollutants (aqueous solubility or octanol/water partition coefficients).
Journal ArticleDOI
The Pesticide Content of Surface Water Draining from Agricultural Fields—A Review
TL;DR: The literature on pesticide losses in runoff waters from agricultural fields is reviewed in this paper, where the majority of commercial pesticides, total losses are 0.5%0 or less of the amounts applied, unless severe rainfall conditions occur within 1-2 weeks after application.
Related Papers (5)
The Effect of streambed topography on surface-subsurface water exchange in mountain catchments
The ecological significance of exchange processes between rivers and groundwater
Matthias Brunke,Tom Gonser +1 more