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Dam Safety Update
A Publication for New Hampshire Dam Owners By the NH Department of Environmental Services Water Division, Dam Bureau
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 Spring/Summer 2003 |
UNDERSTAND AND RESPECT THE DANGER ZONES NEAR DAMS
By Nancy McGrath
Last month, two inexperienced and
ill-equipped kayakers intentionally tried to kayak through a breach in the
flashboards of an 18-foot high dam in New Hampshire, ignoring safety fencing and
warning signs. Both kayakers were thrown from their kayaks once they passed
through the breach, and were trapped in the cold, rolling water at the tailwater
of the dam. One kayaker never came up.
There have been numerous fatalities at dams throughout the
country, but when incidents like this happen close to home, it reminds us of the
dangers associated with the flow of water around dams and how attractive that
danger can be to the public. A great many of you have seen what the force of
water can do to earth or concrete on a dam. The force of water flowing over or
through a spillway is extremely powerful, and generally can’t be physically
overcome by people.
As the water flows over the dam, it creates a circular pull
of water towards the bottom of the dam. This is what pulls a person
back towards the dam, then underwater and then around back
towards the dam. Once caught in this "drowning machine," it's
impossible to escape. Every year people are killed or seriously
injured at dams. Most of these accidents could be avoided by
simply staying clear of the restricted zones at dams, by
understanding the dangers dams can create, and by obeying
all warning devices. If you have visitors at your dam, make sure
they understand the potential dangers.
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In this issue...
Understand and respect the danger zones near dams
Private dam owner tackles principle spillway repair project
Updating your emergency action plan just got easier
Proper slope protection on dams
Do you need a Wetlands Permit to rip rap the upstream face of your dam?
So just what is a "Great Pond" anyway?
Dam security
Funding opportunities for dam removal
Dam removals this summer
Dam Bureau Staff
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