The US Army Corps of Engineers has developed
a Flood-Fight Handbook that includes information on sandbagging, earth fill levees, interior drainage treatment, and flood fight problems.
They also have a Sandbagging Techniques pamphlet which includes procedures and safety tips on efficient bagging operations.
Tim Bertschi, from the US Army Corps of Engineers, demonstrates the proper way to fill a sandbag and build a sandbag levee. Sandbagging Video