Winter is finally giving way to spring. It is time to refresh on skills that are sometimes placed on the shelf due to inclement weather. Swift water rescue training is one of those skills that many departments renew when the weather breaks. Thisweek’s featured report takes us to one of those training sessions for a reminder of what can happen when we let our guard down during training at a low head dam.
“During scheduled training, we were…utilizing the two boat tether system. During the second evolution of the afternoon, the boat crossed the boil line and was swamped with water, but remained upright, submerging the motor and rendering it useless. Due to the excess amount of water in the boat, it was extremely difficult to extract. Extra staffing was called to assist, but the crew on the boat was able to effect the removal before being assisted.”
The power of a low head dam is evident from its nickname; “drowning machine.” The U.S Army Corps of Engineers lists 78,000 low head dams it is aware of. Other sources state that the number may be as high as 2.4 million (Pilgrim, 2008). When someone gets trapped in the dam’s backwash, fire and emergency workers are called to assist. The danger of the dam lies in its construction. A lip is installed at the bottom of the dam. The lip creates a recirculating motion as the water falls over the dam, hits the lip and curls back on itself. This action creates a boil line as huge quantities of water reverse back toward the dam wall (known as “backwash”) and other water continues downstream (known as “outwash”). The recirculating motion is continuous and powerful, trapping anything that enters the backwash. The power of the backwash has killed scores of people (including would be rescuers) through the years. Training at these “drowning machines” has also resulted in numerous mishaps as rescuers are dragged into the backwash. In general, swift water rescue training is one of the most dangerous types of training emergency responders can undertake. Once you have read the entire account (CLICK HERE), and the related reports, consider the following:
Submit your report to www.firefighternearmiss.com today so everyone goes home tomorrow.
Note: The questions posed by the reviewers are designed to generate discussion and thought in the name of promoting firefighter safety. They are not intended to pass judgment on the actions and performance of individuals in the reports.