deep (h c)15092011
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BY: DEEP NAYARAN
M. Tech. (Expl. Geosciences)
Dept.of Geology& Geophysics,IIT KGP, Kharagpur
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The ability of geologic material to move ground wateris called hydraulic conductivity.
it is denoted by `K`.
It is measured in gallons per day per square foot(gpd/ft2) or infeet per day (ft/day).
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Where;Z= elevation head [m]y =pressure head p/g [m]h =total head [m]
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The proportionality constant in Darcys law, which depends on mediumand fluid properties ;Grain size
Density and viscosity of fluid
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Head loss = the potential loss within the sand cylinder
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Pore velocity or average interstitial velocity ,
Fluid dependent measure for the ability of a given soil totransport water intrinsic Permeability, k [m2]Fluid in-dependent measure for the ability of a given soilto transport water
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1m/day = .0012cm/sec
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Symmetric hydraulic conductivity : Kij = Kji (i j) Principal hydraulic conductivity : the coordinate system aligns along the
principal axes ofK such that Kij = 0 (i j) Isotropic hydraulic conductivity : the value ofK does not depend on
direction, i.e., Kij = 0 (i j), and Kii =K
xx xy xz
yx yy yz
zx zy zz
K K K
K K K
K K K
K
Hydraulic conductivity as a tensorTensor
zero-order : a scalar such as hydraulic head, a single-valued quantity
first-order : a vector such as velocity, having three components in generalsecond-order : a tensor such as hydraulic conductivity, having 9 components ingeneral
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Anisotropic reservoirs
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Vertical Hydraulic Conductivity of stratified beds
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Messurement of `K`of Geologic samples
Laboratory methods
of constant head
K = VL/(AtH)
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K=L^2/(ht)
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It is applied for shallow water table conditions.
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where:
h :hydraulic head ,
r :radial distance from the pumping well,
T :aquifer transmisivity
S: aquifer storativity (storage coefficient)
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where:h hydraulic head, rradial distance from the
pumping well, Taquifer transmisivity, Saquifer storativity(storage coefficient)
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h
0hydraulic head before pumping start
h - h0 = s is the drawdown
Q discharge of the well
t time since pumping has started
T transmisivity
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Hindon Sub-Basin (2955' - 306' NL, and 7735' - 7746'EL ) Saharanpur district of Uttar Pradesh (India)
Kolar Sub-Basin( 2240' to 2308' NL and 7701' to 7729'EL) Sehore district of Madhya Pradesh
Narsinghpur District ,Jabalpur division of MadhyaPradesh
Ghataprabha Command (1600'08" to 1688'09" NL and7426'43" to 7556'33" EL )
Lokapavani Command 1228' to 1232' NL and 7640' to7645' EL Pandavapura taluk of Mandya district inKarnataka
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Guelph Permeameter
ICW Permeameter
Jodhpur Permeameter in the laboratory
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Todd,D.K., Groundwater Hydrology second editionJohn wiley & sons.
Kumar, P.C. and Mittal,S. SOIL MOISTURERETENTION CHARACTERISTICS AND HYDRAULICCONDUCTIVITY FOR DIFFERENT AREAS IN INDIAIN SELECTED STATES National Institute ofHydrology ,Roorkee (Uttarakhand), India
www.goole.com
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THANK YOU!