Illustrated is the hydraulic backwash current action characteristic of low-head dams. Boaters, swimmers, waders and anglers can get too close to the downstream side of the dam. They can then become drawn or sucked into the backwash current that takes them to the base of the dam and are forced underwater.
www.fish.state.pa.us/damlow_info.htm www.fish.state.pa.us/damlow_info.htm
The most dangerous kind of dam on a river or stream is a low-head dam. Pennsylvania law requires marking of those low-head dams that meet a statutory definition of "run-of-river dams." There are about 250 dams identified by the Department of Protection as "run-of-river dams.
www.fish.state.pa.us/damhaz.htm www.fish.state.pa.us/damhaz.htm
To determine the fraction of tagged fish that migrated upstream of this low-head dam and the characteristics of selected spawning habitat, we implanted sonic transmitters in 25 striped bass and 25 American shad during 1996 and 1997. We determined preferred depth, water velocity, and substrate composition by measuring...
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a. They pose hazards both above and below dams. "Once primary energy sources, the Fox River's low-head dams that churn cyclone-like waters have become a source of death for more than a dozen people in recent years." "Among th...
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They pose a hazard below and above the dam
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While it is impossible to estimate the number of fatalities which have arisen from recreational activities near low head dams and other water control structures, statistic obtained from specific rivers support the significance of the public safety hazard.
www.stark-stark.com/attorney-lawyer-1017386.html
Safety Considerations: ; There are a lot of safety considerations with regards to low head dams, paddling in general, and any sort of wilderness sport. Here are a few notes.
www.chicagowhitewater.org/cwa/damsafety.asp www.chicagowhitewater.org/cwa/damsafety.asp
If the head is submerged, ... 15. What operational characteristic of Personal Water Craft frequently confuses inexperienced operators, ... 19. What are the four behavioral effects of drinking intoxicants, ranked from those whose effects first appear at the lowest levels? (Balance is degraded at relatively low dosages, one or two...
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06: Give my head peace(22) ... 20: Head Rambles Awareness Week(9) ... 17: Head Rambles Manor on the air(9)
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This characteristic allows operation on sites where the head drops with variation of the flow. ... This is probably the most frequent application for the VLH turbine we will meet in North-America, considering the very large quantity of low head existing dams. In this configuration, the VLH turbine generating set is...
www.vlh-turbine.com/FR/PDF/evenements/MJ2Technologies_T... www.vlh-turbine.com/FR/PDF/evenements/MJ2Technologies_TheVeryLowHeadTurbine_WaterPower_Grenade.pdf