Unusual or Changing Conditions in a Watershed - Revision history

Mpollei@gfnet.com at 16:25, 28 July 2023

2023-07-28T16:25:36Z

← Older revision		Revision as of 16:25, 28 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]]

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Grichards at 22:02, 16 March 2023

2023-03-16T22:02:33Z

← Older revision		Revision as of 22:02, 16 March 2023
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	“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage [[reservoirs]], detailed data on the relation of storage capacity to elevation, location, and size of outlets and [[spillways]], types, sizes, and operation of control gates, and sizes of power plant and [[penstocks]] should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and [[floodplain]], pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<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>		“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage [[reservoirs]], detailed data on the relation of storage capacity to elevation, location, and size of outlets and [[spillways]], types, sizes, and operation of control gates, and sizes of power plant and [[penstocks]] should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and [[floodplain]], pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<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>

			In some cases, [[canals]] may traverse a watershed and import additional flow to the reservoir from outside of its natural drainage area during hydrologic events. Sometimes, peak flows in canals may eclipse runoff from the basin and should be used as the basis for spillway capacity if it is plausible that the canal banks could fail during a hydrologic event.

	==Examples==		==Examples==

Rmanwaring at 20:33, 19 December 2022

2022-12-19T20:33:07Z

← Older revision		Revision as of 20:33, 19 December 2022
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[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]]

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Rmanwaring at 20:32, 19 December 2022

2022-12-19T20:32:38Z

← Older revision		Revision as of 20:32, 19 December 2022
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	Unusual or changing conditions in the watershed may result in larger than expected runoff events that can surprise owners and operators. These conditions may include rain on snow events, frozen or saturated ground, burned watersheds, and more. Urban and agricultural development within a watershed can also lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the [[operation]] of the dam.		Unusual or changing conditions in the watershed may result in larger than expected runoff events that can surprise owners and operators. These conditions may include rain on snow events, frozen or saturated ground, burned watersheds, and more. Urban and agricultural development within a watershed can also lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the [[operation]] of the dam.

	“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage [[reservoirs]], detailed data on the relation of storage capacity to elevation, location, and size of outlets and [[spillways]], types, sizes, and operation of control gates, and sizes of power plant and [[penstocks]] should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and floodplain, pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 ~~Hydrologic Engineering Requirements for Reservoirs~~, USACE, 1997]]</ref>		“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage [[reservoirs]], detailed data on the relation of storage capacity to elevation, location, and size of outlets and [[spillways]], types, sizes, and operation of control gates, and sizes of power plant and [[penstocks]] should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and [[floodplain]], pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<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>

	==Examples==		==Examples==
	{{Website Icon}} [https://damfailures.org/lessons-learned/unusual-hydrologic-conditions/ Learn more about the impacts of unusual or changing conditions in a watershed at DamFailures.org]		{{Website Icon}} [https://damfailures.org/lessons-learned/unusual-hydrologic-conditions/ Learn more about the impacts of unusual or changing conditions in a watershed at DamFailures.org]

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

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Grichards at 02:16, 18 November 2022

2022-11-18T02:16:22Z

← Older revision		Revision as of 02:16, 18 November 2022
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	__NOTOC__		__NOTOC__
			[[Category:Hydrology]]
	----		----
	<!-- 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 -->
	Unusual or changing conditions in the watershed may result in larger than expected runoff events that can surprise owners and operators. These conditions may include rain on snow events, frozen or saturated ground, burned watersheds, and more. Urban and agricultural development within a watershed can also lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the operation of the dam.		Unusual or changing conditions in the watershed may result in larger than expected runoff events that can surprise owners and operators. These conditions may include rain on snow events, frozen or saturated ground, burned watersheds, and more. Urban and agricultural development within a watershed can also lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the [[operation]] of the dam.

	“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage reservoirs, detailed data on the relation of storage capacity to elevation, location, and size of outlets and spillways, types, sizes, and operation of control gates, and sizes of power plant and penstocks should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and floodplain, pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>		“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage [[reservoirs]], detailed data on the relation of storage capacity to elevation, location, and size of outlets and [[spillways]], types, sizes, and operation of control gates, and sizes of power plant and [[penstocks]] should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and floodplain, pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>

	==Examples==		==Examples==

Grichards at 03:15, 17 September 2022

2022-09-17T03:15:02Z

← Older revision		Revision as of 03:15, 17 September 2022
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420)]]		{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420)]]
	~~==Trainings==~~
	~~{{Video Icon}}~~

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Grichards at 03:14, 17 September 2022

2022-09-17T03:14:48Z

← Older revision		Revision as of 03:14, 17 September 2022
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	==Examples==		==Examples==
	{{Website Icon}}		{{Website Icon}} [https://damfailures.org/lessons-learned/unusual-hydrologic-conditions/ Learn more about the impacts of unusual or changing conditions in a watershed at DamFailures.org]
	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420)]]		{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420)]]

Grichards at 03:13, 17 September 2022

2022-09-17T03:13:09Z

← Older revision		Revision as of 03:13, 17 September 2022
Line 2:		Line 2:
	----		----
	<!-- 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 -->
	Urban and agricultural development within a watershed can lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the operation of the dam.		Unusual or changing conditions in the watershed may result in larger than expected runoff events that can surprise owners and operators. These conditions may include rain on snow events, frozen or saturated ground, burned watersheds, and more. Urban and agricultural development within a watershed can also lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the operation of the dam.

	“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage reservoirs, detailed data on the relation of storage capacity to elevation, location, and size of outlets and spillways, types, sizes, and operation of control gates, and sizes of power plant and penstocks should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and floodplain, pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>		“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage reservoirs, detailed data on the relation of storage capacity to elevation, location, and size of outlets and spillways, types, sizes, and operation of control gates, and sizes of power plant and penstocks should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and floodplain, pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>

Rmanwaring: Created page with "NOTOC ---- Urban and agricultural development within a watershed can lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the wa..."

2022-09-09T00:33:55Z

Created page with "__NOTOC__ ----  Urban and agricultural development within a watershed can lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the wa..."

New page

__NOTOC__
----

Urban and agricultural development within a watershed can lead to measurable effects in hydrologic conditions such as the runoff ratio and the time of concentration. While it is essential that owners, engineers, and stakeholders are acutely aware of changes occurring at the dam, it is also important that they are aware of changing conditions throughout the watershed and attempt to accurately predict how those changing conditions may affect the operation of the dam.

“Streamflow at any particular location can be greatly affected by hydraulic structures located upstream. It is important, therefore, that essential data be obtained on all significant hydraulic structures located in and upstream from a study area. For diversion structures, detailed data are required on the size of the diversion dam, capacity of the diversion canal, and the probable size of flood required to washout the diversion dam. In the case of storage reservoirs, detailed data on the relation of storage capacity to elevation, location, and size of outlets and spillways, types, sizes, and operation of control gates, and sizes of power plant and penstocks should be known. Bridges can produce backwater effects which will cause upstream flooding, This flooding may be produced by the approach roads, constriction of the channel and floodplain, pier shapes, the angle between the piers and the streamflow, or the pier length-width ratios”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>

==Examples==
{{Website Icon}}
==Best Practices Resources==
{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420)]]
==Trainings==
{{Video Icon}}


{{Citations}}


{{revhistinf}}