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Queensland has recently experienced an increase in mining activity.
As part of the rehabilitation process once those mines are mined out, dig a connecting pipe or trench from the nearest river system, with a sluice gate to be owned by, say, the State Emergency Service. In high-rainfall conditions,
open the sluice gate and divert part of the flood-water into the underground mine.
Depending on the characteristics of the country rock, the intervening drought periods (southern Queensland has just been through a seven-year drought) will see the water either seep into the surrounding water table or become available for pumping out for irrigation (or a bit of both). These are both better outcomes than evaporation or flushing out to sea.
||Compared to the volume of water in the floods,
mines would only be able to sink a tiny amount.
||Drilling many, many small, deep "dry" boreholes to
allow water to sink into permeable strata during
flooding might, however, have some benefit in
||Have we done solutions involving jello? There are some
polymers which will gel at very, very low concentrations. A
few tons dumped in a line parallel to the river would slow
the flood down impressively. It could even be flavoured.