An underground gasoline storage tank has leaked benzene into an unconfined aquif

Question

An underground gasoline storage tank has leaked benzene into an unconfined aquifer over a period of several months. The aquifer characteristics are: Ambient temperature=8 oC Hydraulic conductivity = 123 ft/day Hydraulic gradient = 0.00091 ft/ft Effective porosity = 0.31 Total organic carbon = 198 mg/kg Bulk density = 1.65 g/cm3 What is the average velocity of the groundwater? Provide documentation of work and indicate the final answer for full credit. (a) 0.033 m/d (b) 0.11 m/d (c) 0.44 m/d (d) 80 m/d Please i need the answer and how you did it .. thanks

Explanation / Answer

The velocity of groundwater is based on hydraulic conductivity (K), as well as the hydraulic head (I). Therefore, the equation determined by Darcy to describe the basic relationship between subsurface materials and the movement of water through them is

Q = KIA

Flow= Q*unit area

where Q is the volumetric flow rate (or discharge)

and A is the area that the groundwater is flowing through.

This relationship is known as Darcy

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