The impact of urban groundwater upon surface water - eTheses ...

K = hydraulic conductivity (feet day -1 )
C = a shape factor
d50 = the mean grain diameter (mm)
j = an exponent
MONITORING NETWORKS AND METHODS
The shape factor and exponent (Table 4.3) are greatest for texturally mature sediments which
are characteristically well sorted with uniformly sized particles with a high degree of
roundness and sphericity.
Table 4.3 Representative values of the Shepherd shape factors and exponents for different
levels of sediment maturity (hydraulic conductivity values derived will be in feet day -1 ).
Sediment Character Shape factor ‘C’ Exponent ‘j’
Texturally mature
Glass spheres 40000 2
Dune deposits 5000 1.85
Beach deposits 1600 1.75
Channel deposits 450 1.65
Consolidated sediments 100 1.5
Texturally immature
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