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Dispersivity Theory Xu,
M. and Y. Eckstein, 1995. Use of weighted least-squares method in evaluation of
the relationship between dispersivity and field scale, Ground Water, 33(6):
905-908. Eqn
12b:
Eqn
14b:
Neuman,
S. P., 1990. Universal scaling of hydraulic conductivities and dispersivities in
geologic media, Water Resources Research, 26(8): 1749-1758.
Ayra,
A., 1986. Dispersion and reservoir heterogeneity, Ph.D. Dissertation, University
of Texas, Austin, TX.
Other
References: Gelhar,
L. W., C. Welty and K. R. Rehfeldt, 1992. A critical review of data on
field-scale dispersion in aquifers, Water Resources Research, 28(7): 1955-1974.
Equations
for the approximating dispersivity in the literature appear in the literature.
These empirical equations are generally based on field observations and
use a characteristic length, L. Listed
below are the equations used in the dispersivity calculator. 
