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(6.9)
where
is the kinematic viscosity of water which is a function of temperature (Fig. 6.6).
A constant value of some 10
-6
m2/s can normally be assumed since the temperature of
water in a shallow rock mass hardly varies with time and location.
ν
Figure 6.5
Laminar steady state fl ow in a planar discontinuity (Wittke 1990)
The mean velocities and are obtained from (6.9) by integration over the aper-
ture of the discontinuity (Fig. 6.5):
(6.10)
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