Groundwater - Flow magnitude

10 important questions on Groundwater - Flow magnitude

What does ΔH : Δx represent?

The hydraulic head gradient. It gives the decrease in hydraulic head over a certain distance in the flow direction. Larger gradient is larger discharge.

What is the 2-dimensional discharge?

q = k x D x (ΔH : Δx).
It is used for when the vertical cross-section is similar for a longer distacne or when the water balance approach is used to compute flow magnitude.

What is the flux density?

Flow per unit of area, 1 dimentional.
v = k x (ΔH : Δx)
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What does deltaH stand for?

The difference in hydraulic head

How can the discharge through a colomn be computed?

Q = k x A x (ΔH:L)

What is the hydraulic head gradient?

(deltaH)/(deltax)

What is the borehole method?

An alternative to measure k directly in the field. Water is pumped into or out of a hole drilled in the soil and k is determined from the water level change in the hole.

What is the formula for 2-dimensional discharge?

q=kxDx(deltaH/deltax)

What is the formula for flux-density?

V = k x (deltaH/deltax)

What is darcy's law for vertical flow?

V=deltaH/c

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