Infiltration of atrazine and metabolites from a stream to an alluvial aquifer

The infiltration of atrazine, deethylatrazine, and deisopropylatrazine from Walnut Creek, a tributary stream, to the alluvial valley aquifer along the South Skunk River in central Iowa occurred where the stream transects the river's flood plain. A preliminary estimate indicated that the infiltr...

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Bibliographic Details
Published in:Journal of the American Water Resources Association 1997-02, Vol.33 (1), p.89-95
Main Authors: Squillace, P.J. (US Geological Survey, Rapid City, SD.), Burkart, M.R, Simpkins, W.W
Format: Article
Language:English
Subjects:
AGUA SUPERFICIAL
AGUAS SUBTERRANEAS
alluvial aquifer
ATRAZINA
ATRAZINE
CAPA FREATICA
COURS D'EAU
CURSOS DE AGUA
DEBIT
DEETHYLATRAZINE
DEISOPROPATRAZINE
deisopropylatrazine
Earth sciences
Earth, ocean, space
EAU SOUTERRAINE
EAU SUPERFICIELLE
ESCORRENTIA
Exact sciences and technology
FLOOD PLAINS
FLOW RATE
Freshwater
GASTO
GROUNDWATER
GROUNDWATER TABLE
Hydrology. Hydrogeology
INFILTRACION
INFILTRATION
INTERACTIONS
IOWA
LLANURA ALUVIAL
METABOLITE
METABOLITES
METABOLITOS
NAPPE SOUTERRAINE
PLAINE D'INONDATION
RIVERS
RUISSELLEMENT
RUNOFF
stream aquifer interaction
STREAM AQUIFER INTERACTIONS
SURFACE WATER
WALNUT CREEK
Water resources
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Description
Summary:The infiltration of atrazine, deethylatrazine, and deisopropylatrazine from Walnut Creek, a tributary stream, to the alluvial valley aquifer along the South Skunk River in central Iowa occurred where the stream transects the river's flood plain. A preliminary estimate indicated that the infiltration was significant and warrants further investigation. Infiltration was estimated by measuring the loss of stream discharge in Walnut Creek and the concentrations of atrazine and its metabolites deethylatrazine and deisopropylatrazine, in ground water 1 m beneath the streambed. Infiltration was estimated before application of agrichemicals to the fields during a dry period on April 7, 1994, and after application of agrichemicals during a period of small runoff on June 8, 1994. On April 7, the flux of atrazine, deethylatrazine, and deisopropylatrazine from Walnut Creek into the alluvial valley aquifer ranged from less than 10 to 60 (microgram/d)/m2, whereas on June 8 an increased flux ranged from 270 to 3060 (microgram(d)/m2. By way of comparison, the calculated fluxes of atrazine beneath Walnut Creek, for these two dates, were two to five orders of magnitude greater than an estimated flux of atrazine to ground water caused by leaching from a field on a per-unit area basis. Furthermore, the unit-area flux rates of water from Walnut Creek to the alluvial valley aquifer were about three orders of magnitude greater than estimated recharge to the alluvial aquifer from precipitation. The large flux of chemicals from Walnut Creek to the alluvial valley aquifer was due in part to the conductive streambed and rather fast ground water velocities; average vertical hydraulic conductivity through the streambed was calculated as 35 and 90 m/d for the two sampling dates, and estimated ground water velocities ranged from 1 to 5 m/d
ISSN:1093-474X
0043-1370
1752-1688
DOI:10.1111/j.1752-1688.1997.tb04085.x