After penetrating a confined aquifer, water rises into the well casing to a poin

Question

After penetrating a confined aquifer, water rises into the well casing to a point 6.4 m above the top of the confined aquifer. The well casing has an inside diameter of 15 cm. The top of the confined aquifer is 675 m above sea le At the top of the confined aquifer: [3 each] (a) What is the pressure? (report as N/m2) (b) What is the pressure head? (c) What is the elevation head? (d) What is the hydraulic head? (e) How fast must the water move in the aquifer (not in the well) in order to make the 2. be a value equal to or greater than 1% of the pressure term.) Is a flow rate of this magnitude realistic for groundwater flow?

Explanation / Answer

a) pressure is calculated by following formula

p = pw*g*hp

here pw = density of water = 1000 kg/m3

       g = acceleration due to gravity = 9.81 m/sec2

   hp (pressure head) = 6.4m

p = 1000*9.81*6.4

    = 62784 N/m2

B) Pressure Head = 6.4m

C) Elevation head = 675m

D) Hydraulic head = pressure head + elevation head

                           = 6.4 + 675

                          = 681.4m

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