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The Hydrologic and Geologic Aspects of a Perching Layer‐San Joaquin Valley, Western Fresno County, California a
Author(s) -
Haskell E. E.,
Bianchi W. C.
Publication year - 1967
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1967.tb01620.x
Subject(s) - san joaquin , piezometer , geology , water table , hydrology (agriculture) , alluvium , aquifer , water well , groundwater , alluvial fan , geomorphology , geotechnical engineering , soil science , structural basin
A shallow, wide spread perching layer was isolated in the alluvial profiles of western Fresno County, California. Geologic and hydrologic interpretations are given, based on field and laboratory measurements of the physical properties of this layer. Some of the approaches investigated included using existing electrical logs from irrigation wells, head loss observations in wells and piezometers, core drilling, and core analysis. Differences in alluvial profile permeabilities are shown which result in perched water under the existing field flow conditions. The quantity of vertical flow through the layer is estimated using core permeabilities and hydraulic gradients observed in the field. Hydraulic properties and descriptions for the perched zone are presened which can be used to delineate profile flow limitations at other locations in the San Joaquin Valley. The study may be used in estimating the rate at which this perched water table could rise If, in the future, imported water and changes in irrigation patterns cause a large quantity of water to flow vertically.