Hydraulic transience and the role of bedding fractures in a bedrock aquitard, southeastern Wisconsin, USA

Details Hydraulic transience and the role of bedding fractures in a bedrock aquitard, southeastern Wisconsin, USA Hydraulic transience and the role of bedding fractures in a bedrock aquitard, southeastern Wisconsin, USA

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rhls4e&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. HLS 4-1, CiteID 1961, DOI 10.1029/2003GL017913

Physics

Geophysics

3

Hydrology: Groundwater Hydrology, Physical Properties Of Rocks: Permeability And Porosity, Physical Properties Of Rocks: Fracture And Flow, Exploration Geophysics: Downhole Methods, Hydrology: Water Supply

Scientific paper

Hydraulic heads in a dolomitic shale bedrock aquitard in Wisconsin, USA, are apparently not in equilibrium with drawdown in the underlying aquifer system caused by pumping for municipal supply over the last century. Measurements of head with depth, downhole geophysical logs, and estimates of hydraulic conductivity indicate very low vertical hydraulic diffusivity, and show that high horizontal permeability within the aquitard due to bedding-plane fracture zones can allow lateral groundwater flow. Unlike the hydrogeological conceptual models used in many investigations, flow in aquitards cannot always be inferred to be primarily one-dimensional and vertical. Failure to account for transient conditions and lateral flow in similar settings of intensive groundwater pumping could lead to error in estimates of aquitard leakage and underlying aquifer properties.

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