Average horizontal flow velocity (V) in fractures can be computed using the formula below which is derived from the cubic law assuming fractures as parallel plates (Snow, 1965; Romm, 1966; Qian et al., 2011).

V =[(b^2)*g/(12*v )]*i

where: where b is the average hydraulic aperture, g is the acceleration due to gravity, v is the kinematic viscosity of water and i is the hydraulic gradient along the fracture direction.

There is in the literature a formula that is commonly used for computation of the hydraulic aperture in both fractured carbonate and crystalline aquifers at depths

Dear Amar Agarwal

According to Darcy Law:

V (Velocity) = (K (Permeability)/Miu (Viscosity)) * dP/dL (Pressure Gradient)

Here, K = H^2/12 for parallel plate or fracture, where H is the channel width

Best,

Bijan

thank you very much for the answers.

Dear Amar Agarwal,

You are welcome.

Regards

Dear Amar Agarwal ,

The correct way has been proposed by Bachir Achour