Usually the sandbags are scooped up with end-loaders. Often, they must then be disposed of as "toxic waste" due to contamination from chemicals and raw sewage.
http://www.freshpatents.com/Water-filled-flood-bags-for-emergency-flood-control-dt20071018ptan20070243021.php
OK, this is technically off topic, but railroad flooding is what led to this question, so . . .
A midwestern tradition is sandbagging along rivers during floods to save towns. During the flood, they will have 1000s of people come bild these make-shift levies.
Who takes them down, and how? Seems like it would not be very easy to get rid of a few million sandbags.
Gabe
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