This Team builder is perfect for groups of 4-12. You will need a multi-person tent, short pieces of rope and a hose connected to a water supply.
Pair up your leaders and tie two of their hands together so each group has a usable right and left hand (they cannot use their tied hands). The entire group now has approximately 10 minutes to set up a tent before it begins to rain. Everyone must fit in tent. At the 10 minute mark use a large hose to simulate the storm.