Mine Flooding: 2D Section and Water Balance

Hydrogeology

Aquifer head above shaft bottom 330 m

Transmissivity T 60 m2/d

Storm recharge inflow 0 m3/h

Void fraction of workings 0.50

Dewatering

Pumps installed 3

Capacity per pump 120 m3/h

Readouts

Water level

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Levels flooded

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Inflow

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Pump capacity

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Net rise rate

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Pumping power

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Elapsed

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Acid generation index

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Status

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Q_in = 2 pi T (H_aq - h)/ln(R/r) (+ fractures); dh/dt = (Q_in - Q_pump)/A(h) with storage in shaft and six levels; pump power = rho g Q lift/eta. Pyrite in the lower levels oxidises (acid) while exposed above the water.