Protecting your work site, rainfalls cause landslides, control flooding, Divert water flow. Throw some bags down and let them go to work for you http://www.stormtec.net/
Deployment of these bags just like sandbags, protect your home , your business , your library, your museum. When disasters have struck large workforces are hard to come by.
The simple and fast solution is again the Stormbag. One person can do the work of many in the same or less time.