Floodplain - Revision history

Mpollei@gfnet.com at 05:16, 21 July 2023

2023-07-21T05:16:09Z

← Older revision		Revision as of 05:16, 21 July 2023
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	<!-- Add picture caption -->		<!-- Add picture caption -->
	\|caption= Canning River fork in Alaska with floodplain.		\|caption= Canning River fork in Alaska with floodplain.
			(Image Source: [https://en.wikipedia.org/wiki/Canning_River_%28Alaska%29 Wikipedia])
	}}		}}

Mpollei@gfnet.com at 22:35, 11 July 2023

2023-07-11T22:35:29Z

← Older revision		Revision as of 22:35, 11 July 2023
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE~~, 1997~~]]		{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE]]
	{{Website Icon}} [https://www.fema.gov/floodplain-management Floodplain Management Website (Federal Emergency Management Agency)]		{{Website Icon}} [https://www.fema.gov/floodplain-management Floodplain Management Website (Federal Emergency Management Agency)]

Grichards at 20:19, 16 December 2022

2022-12-16T20:19:40Z

← Older revision		Revision as of 20:19, 16 December 2022
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]		{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]
	{{Website Icon}} {https://www.fema.gov/floodplain-management Floodplain Management Website (Federal [[Emergency Management]] Agency)]		{{Website Icon}} [https://www.fema.gov/floodplain-management Floodplain Management Website (Federal Emergency Management Agency)]

	<!-- In the location of an in text citation, simply enclose the citation as follows: <ref> citation </ref>. Citations will automatically populate. Learn more at https://www.mediawiki.org/wiki/Help:Cite.-->		<!-- In the location of an in text citation, simply enclose the citation as follows: <ref> citation </ref>. Citations will automatically populate. Learn more at https://www.mediawiki.org/wiki/Help:Cite.-->

Grichards at 20:18, 16 December 2022

2022-12-16T20:18:59Z

← Older revision		Revision as of 20:18, 16 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->
	Floodplain management is a community-based effort to prevent or reduce the risk of flooding. The ~~Federal~~ [[Emergency Management]] ~~Agency~~ administers the National Flood Insurance Program (NFIP) and sets minimum floodplain management standards for participating communities. Floodplain regulations and ordinances are typically enforced on a local level.		Floodplain management is a community-based effort to prevent or reduce the risk of flooding. The [[Federal Emergency Management Agency]] administers the National Flood Insurance Program (NFIP) and sets minimum floodplain management standards for participating communities. Floodplain regulations and ordinances are typically enforced on a local level.

	Dams are commonly located within floodplains, and are therefore subject to floodplain regulations. When located within or upstream of a regulatory 100-year floodplain or floodway as defined by FEMA, dam modification projects are subject to limitations on the amount of flood elevation rise that is allowable. Constriction of the floodplain can result in increases to flooding elevations upstream of a dam, while expansion of a spillway can result in an increase in outflows during the 100-year base flow event and subsequent increased impacts to the downstream floodplain. Even in areas where a regulatory floodplain is not defined, local regulations may apply.		Dams are commonly located within floodplains, and are therefore subject to floodplain regulations. When located within or upstream of a regulatory 100-year floodplain or floodway as defined by FEMA, dam modification projects are subject to limitations on the amount of flood elevation rise that is allowable. Constriction of the floodplain can result in increases to flooding elevations upstream of a dam, while expansion of a spillway can result in an increase in outflows during the 100-year base flow event and subsequent increased impacts to the downstream floodplain. Even in areas where a regulatory floodplain is not defined, local regulations may apply.
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]		{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]
			{{Website Icon}} {https://www.fema.gov/floodplain-management Floodplain Management Website (Federal [[Emergency Management]] Agency)]

	<!-- In the location of an in text citation, simply enclose the citation as follows: <ref> citation </ref>. Citations will automatically populate. Learn more at https://www.mediawiki.org/wiki/Help:Cite.-->		<!-- In the location of an in text citation, simply enclose the citation as follows: <ref> citation </ref>. Citations will automatically populate. Learn more at https://www.mediawiki.org/wiki/Help:Cite.-->

Grichards at 20:17, 16 December 2022

2022-12-16T20:17:40Z

← Older revision		Revision as of 20:17, 16 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->
	"Channel capacity ~~also~~ depends on the long-term trends in downstream floodplain land use. While it is not a hydrologic problem, channel capacity studies should recognize the impact of floodplain encroachments on what is considered the nondamaging channel capacity. Anecdotal history has shown that many ~~Corps'~~ projects are not able to make planned channel-capacity releases due to development and encroachment downstream."<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]</ref>		Floodplain management is a community-based effort to prevent or reduce the risk of flooding. The Federal [[Emergency Management]] Agency administers the National Flood Insurance Program (NFIP) and sets minimum floodplain management standards for participating communities. Floodplain regulations and ordinances are typically enforced on a local level.

			Dams are commonly located within floodplains, and are therefore subject to floodplain regulations. When located within or upstream of a regulatory 100-year floodplain or floodway as defined by FEMA, dam modification projects are subject to limitations on the amount of flood elevation rise that is allowable. Constriction of the floodplain can result in increases to flooding elevations upstream of a dam, while expansion of a spillway can result in an increase in outflows during the 100-year base flow event and subsequent increased impacts to the downstream floodplain. Even in areas where a regulatory floodplain is not defined, local regulations may apply.

			In addition to impacts during large flood events, consideration should be given to the downstream impact of releases from dams during normal [[operation]]. [[Unexpected Changes in Water Level\|Upexpected changes in water levels]] can overwhelm unsuspecting people recreating or working within the downstream floodplain. "Channel capacity depends on the long-term trends in downstream floodplain land use. While it is not a hydrologic problem, channel capacity studies should recognize the impact of floodplain encroachments on what is considered the nondamaging channel capacity. Anecdotal history has shown that many projects are not able to make planned channel-capacity releases due to development and encroachment downstream."<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]</ref>

	==Best Practices Resources==		==Best Practices Resources==

Grichards at 17:49, 14 December 2022

2022-12-14T17:49:42Z

← Older revision		Revision as of 17:49, 14 December 2022
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	"Channel capacity also depends on the long-term trends in downstream floodplain land use. While it is not a hydrologic problem, channel capacity studies should recognize the impact of floodplain encroachments on what is considered the nondamaging channel capacity. Anecdotal history has shown that many Corps' projects are not able to make planned channel-capacity releases due to development and encroachment downstream."<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]</ref>		"Channel capacity also depends on the long-term trends in downstream floodplain land use. While it is not a hydrologic problem, channel capacity studies should recognize the impact of floodplain encroachments on what is considered the nondamaging channel capacity. Anecdotal history has shown that many Corps' projects are not able to make planned channel-capacity releases due to development and encroachment downstream."<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]</ref>

	==[[Best Practices Resources]]==		==Best Practices Resources==
	{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]		{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]

Rmanwaring at 23:01, 12 December 2022

2022-12-12T23:01:16Z

← Older revision		Revision as of 23:01, 12 December 2022
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	\|link=		\|link=
	<!-- Add picture caption -->		<!-- Add picture caption -->
	\|caption= Canning River fork with floodplain.		\|caption= Canning River fork in Alaska with floodplain.
	}}		}}

Rmanwaring at 23:00, 12 December 2022

2022-12-12T23:00:48Z

← Older revision		Revision as of 23:00, 12 December 2022
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	{{Picture		{{Picture
	<!-- Add image file name (ex.image.jpg) -->		<!-- Add image file name (ex.image.jpg) -->
	\|image=		\|image= Canning_River_fork.jpg
	<!--Add link if applicable -->		<!--Add link if applicable -->
	\|link=		\|link=
	<!-- Add picture caption -->		<!-- Add picture caption -->
	\|caption=		\|caption= Canning River fork with floodplain.
	}}		}}

Rmanwaring: Created page with " NOTOC Category: Environmental ---- {{Picture |image= |link= |caption= }} "Channel capacity also depends on the long-term trends in downstream flo..."

2022-12-12T22:55:13Z

Created page with " __NOTOC__  Category: Environmental ---- {{Picture  |image=  |link=  |caption= }}  "Channel capacity also depends on the long-term trends in downstream flo..."

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"Channel capacity also depends on the long-term trends in downstream floodplain land use. While it is not a hydrologic problem, channel capacity studies should recognize the impact of floodplain encroachments on what is considered the nondamaging channel capacity. Anecdotal history has shown that many Corps' projects are not able to make planned channel-capacity releases due to development and encroachment downstream."<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]</ref>

==[[Best Practices Resources]]==
{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE, 1997]]


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