Swift Currents over Spillways - Revision history

Mpollei@gfnet.com at 18:23, 19 July 2023

2023-07-19T18:23:04Z

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 [[Category:Risk Assessment Public Safety]]
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 Water flows over low-head dams and over dam [[spillways]] are particularly dangerous as they may be difficult to recognize and may not be visible from upstream, due to their low profile and false-horizon appearance. If the crest of the dam is left unmarked and unprotected, boaters in the reservoir can be drawn over the dam or spillway. Jet skiers, canoes, kayaks, and power boats have driven off the crest of low-head dams, unaware of the sudden drop, with tragic consequences. More often, motor boaters experience engine problems and lose control of their boats and are carried by the current over the edge.

Mpollei@gfnet.com at 20:16, 11 July 2023

2023-07-11T20:16:25Z

← Older revision		Revision as of 20:16, 11 July 2023
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	<noautolinks>==Best Practices Resources==</noautolinks>		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}} [[Dam Safety Warning Signs Best Practices (FEMA P-2188) \| Dam Safety Warning Signs Best Practices (FEMA P-2188), FEMA~~, 2021~~]]		{{Document Icon}} [[Dam Safety Warning Signs Best Practices (FEMA P-2188) \| Dam Safety Warning Signs Best Practices (FEMA P-2188), FEMA]]

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Rmanwaring at 14:58, 14 December 2022

2022-12-14T14:58:23Z

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	Dam owners and operators should also be cognizant of these dangerous hydraulic hazards and mark the approaches to the dam and spillway entrances with signs, buoys or log booms.		Dam owners and operators should also be cognizant of these dangerous hydraulic hazards and mark the approaches to the dam and spillway entrances with signs, buoys or log booms.

	==Best Practices Resources==		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}} [[Dam Safety Warning Signs Best Practices (FEMA P-2188)\|Dam Safety Warning Signs Best Practices (~~Federal Emergency Management Agency~~)]]		{{Document Icon}} [[Dam Safety Warning Signs Best Practices (FEMA P-2188) \| Dam Safety Warning Signs Best Practices (FEMA P-2188), FEMA, 2021]]

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Grichards at 04:50, 18 November 2022

2022-11-18T04:50:11Z

← Older revision		Revision as of 04:50, 18 November 2022
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	__NOTOC__		__NOTOC__
			[[Category:Risk Assessment Public Safety]]
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	<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->		<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
	Water flows over low-head dams and over dam spillways are particularly dangerous as they may be difficult to recognize and may not be visible from upstream, due to their low profile and false-horizon appearance. If the crest of the dam is left unmarked and unprotected, boaters in the reservoir can be drawn over the dam or spillway. Jet skiers, canoes, kayaks, and power boats have driven off the crest of low-head dams, unaware of the sudden drop, with tragic consequences. More often, motor boaters experience engine problems and lose control of their boats and are carried by the current over the edge.		Water flows over low-head dams and over dam [[spillways]] are particularly dangerous as they may be difficult to recognize and may not be visible from upstream, due to their low profile and false-horizon appearance. If the crest of the dam is left unmarked and unprotected, boaters in the reservoir can be drawn over the dam or spillway. Jet skiers, canoes, kayaks, and power boats have driven off the crest of low-head dams, unaware of the sudden drop, with tragic consequences. More often, motor boaters experience engine problems and lose control of their boats and are carried by the current over the edge.

	If the width of the stream or reservoir narrows on the approach to a dam or spillway structure, the currents over the dam head will increase in velocity. This change in speed can catch people by surprise, drawing in swimmers, kayakers, canoers, and motor boaters towards the dam and over it before they have a chance to respond.		If the width of the stream or reservoir narrows on the approach to a dam or spillway structure, the currents over the dam head will increase in velocity. This change in speed can catch people by surprise, drawing in swimmers, kayakers, canoers, and motor boaters towards the dam and over it before they have a chance to respond.

Grichards at 19:48, 16 September 2022

2022-09-16T19:48:29Z

← Older revision		Revision as of 19:48, 16 September 2022
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	<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->		<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
	~~[Paragraph here]~~		Water flows over low-head dams and over dam spillways are particularly dangerous as they may be difficult to recognize and may not be visible from upstream, due to their low profile and false-horizon appearance. If the crest of the dam is left unmarked and unprotected, boaters in the reservoir can be drawn over the dam or spillway. Jet skiers, canoes, kayaks, and power boats have driven off the crest of low-head dams, unaware of the sudden drop, with tragic consequences. More often, motor boaters experience engine problems and lose control of their boats and are carried by the current over the edge.

	~~==Other Headings==~~		If the width of the stream or reservoir narrows on the approach to a dam or spillway structure, the currents over the dam head will increase in velocity. This change in speed can catch people by surprise, drawing in swimmers, kayakers, canoers, and motor boaters towards the dam and over it before they have a chance to respond.
	~~Info~~
			Before heading out on any waterway or body of water, it is critical to view a map (not all dams are indicated on maps, however), ask a local to point out hazards, look out for signage indicating hazards and dams (these are not always present), and always remain alert to the possibility of changes in currents near dam structures. It may be necessary to pull out a safe distance upstream and portage the hazard before re-entering the water a safe distance downstream away from the drop or hazardous hydraulic. Oftentimes people do not have time to get out of the water above the hydraulic or put back in the water too close to the hydraulic downstream and face catastrophic consequences.

			Dam owners and operators should also be cognizant of these dangerous hydraulic hazards and mark the approaches to the dam and spillway entrances with signs, buoys or log booms.

	~~==Examples==~~
	~~{{Website Icon}}~~
	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}}		{{Document Icon}} [[Dam Safety Warning Signs Best Practices (FEMA P-2188)\|Dam Safety Warning Signs Best Practices (Federal Emergency Management Agency)]]
	~~==Trainings==~~
	~~{{Video Icon}}~~

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Rmanwaring: Created page with "NOTOC ---- [Paragraph here] ==Other Headings== Info ==Examples== {{Website Icon}} ==Best Practices Resources== {{Document Icon}} ==Trainings== {{Video Icon}}

Swift Currents over Spillways - Revision history

Mpollei@gfnet.com at 18:23, 19 July 2023

Mpollei@gfnet.com at 20:16, 11 July 2023

Rmanwaring at 14:58, 14 December 2022

Grichards at 04:50, 18 November 2022

Grichards at 19:48, 16 September 2022

Rmanwaring: Created page with "__NOTOC__ ---- [Paragraph here] ==Other Headings== Info ==Examples== {{Website Icon}} ==Best Practices Resources== {{Document Icon}} ==Trainings== {{Video Icon}}

Rmanwaring: Created page with "NOTOC ---- [Paragraph here] ==Other Headings== Info ==Examples== {{Website Icon}} ==Best Practices Resources== {{Document Icon}} ==Trainings== {{Video Icon}}