Groundwater - Residence time

6 important questions on Groundwater - Residence time

Why is the residence time of water in the ground important for water quality?

Pathogens die after a certain timeframe in the ground

What is the effective porosity?

The fraction of the soil volume which is occupied by pores through which water can flow.

What is the formula for flow velocity?

ve = (k/ne) x (∆H/∆x) = Rx /(D x ne)
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What is the formula for average residence time for a field?

Tr = (D · ne) / R

with
Tr is residence time
D is layer thickness
R is recharge
ne is effective porosity

What is the flow velocity?

Ve = (k:ne) x (ΔH:Δx)

What are groundwater protection zones?

Zones around extraction wells to protect water from any form of pollution

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