Decommissioning of Outlet Works - Revision history

Mpollei@gfnet.com at 16:46, 11 July 2023

2023-07-11T16:46:14Z

← Older revision		Revision as of 16:46, 11 July 2023
Line 10:		Line 10:

	<noautolinks>==Best Practices Resources==</noautolinks>		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}}[[Technical Manual: Conduits through Embankment Dams (FEMA P-484) \| Technical Manual: Conduits through Embankment Dams (FEMA P-484), FEMA~~, 2005~~]]		{{Document Icon}}[[Technical Manual: Conduits through Embankment Dams (FEMA P-484) \| Technical Manual: Conduits through Embankment Dams (FEMA P-484), FEMA]]

	<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->		<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->

Rmanwaring: /* Best Practices Resources */

2022-12-13T21:56:54Z

Best Practices Resources

← Older revision		Revision as of 21:56, 13 December 2022
Line 9:		Line 9:
	“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />		“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />

	==Best Practices Resources==		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}}[[Technical Manual: Conduits through Embankment Dams (FEMA P-484)\|Technical Manual: Conduits through Embankment Dams (~~Federal Emergency Management Agency~~)]]		{{Document Icon}}[[Technical Manual: Conduits through Embankment Dams (FEMA P-484) \| Technical Manual: Conduits through Embankment Dams (FEMA P-484), FEMA, 2005]]

	<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->		<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->

Grichards at 06:06, 18 November 2022

2022-11-18T06:06:31Z

← Older revision		Revision as of 06:06, 18 November 2022
Line 1:		Line 1:
	__NOTOC__		__NOTOC__
	[[Category:~~Decommissioning of~~ Outlet Works]]		[[Category:Outlet Works]]
	----		----
	<!-- 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 -->

Grichards at 05:59, 18 November 2022

2022-11-18T05:59:55Z

← Older revision		Revision as of 05:59, 18 November 2022
Line 1:		Line 1:
	__NOTOC__		__NOTOC__
			[[Category:Decommissioning of Outlet Works]]
	----		----
	<!-- 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 -->
	“When the existing conduit deteriorates to a point where it can no longer serve its intended design purpose, a decision must be made to renovate, remove/replace, or to abandon it. In some cases, the designer may find it technically and economically more feasible to abandon the conduit by grouting it closed and leaving it in place. For instance, abandonment has some advantages over removing the conduit because a large trench is not required to be excavated transverse to the embankment dam. Backfilled excavations in an existing embankment are a source of differential settlement and potential hydraulic fracture. If abandonment is selected, a filter diaphragm or collar should be part of a design to intercept any flow that could potentially occur through defects in the grouted conduit or along the interface between the existing conduit and earthfill”.<ref name="Conduits through Embankments">[[Technical Manual: Conduits through Embankment Dams (FEMA P-484) \| FEMA 484 Technical Manual: Conduits through Embankment Dams, FEMA, 2005]]</ref>		“When the existing conduit deteriorates to a point where it can no longer serve its intended design purpose, a decision must be made to renovate, remove/replace, or to abandon it. In some cases, the designer may find it technically and economically more feasible to abandon the conduit by [[grouting]] it closed and leaving it in place. For instance, [[abandonment]] has some advantages over removing the conduit because a large trench is not required to be excavated transverse to the embankment dam. Backfilled excavations in an existing embankment are a source of differential [[settlement]] and potential hydraulic fracture. If abandonment is selected, a filter diaphragm or collar should be part of a design to intercept any flow that could potentially occur through defects in the grouted conduit or along the interface between the existing conduit and earthfill”.<ref name="Conduits through Embankments">[[Technical Manual: Conduits through Embankment Dams (FEMA P-484) \| FEMA 484 Technical Manual: Conduits through Embankment Dams, FEMA, 2005]]</ref>

	“Another possible reason for abandoning an existing conduit would be when a proposed embankment dam raise would result in much higher embankment loads over portions of the conduit. Structural analysis may determine that the higher embankment loads would fail the existing conduit and measures to strength it are not feasible. To prevent failure and to reduce the potential for internal erosion and backward piping erosion of embankment materials, the existing conduit would need to be abandoned and a new conduit constructed. The abandonment of the existing conduit may best be postponed until after the replacement conduit has been constructed and is fully operational. The existing conduit is used for diversion while the new conduit is constructed”.<ref name="Conduits through Embankments" />		“Another possible reason for abandoning an existing conduit would be when a proposed embankment dam raise would result in much higher embankment loads over portions of the conduit. [[Structural]] analysis may determine that the higher embankment loads would fail the existing conduit and measures to strength it are not feasible. To prevent failure and to reduce the potential for internal erosion and backward piping erosion of embankment materials, the existing conduit would need to be abandoned and a new conduit constructed. The abandonment of the existing conduit may best be postponed until after the [[replacement]] conduit has been constructed and is fully operational. The existing conduit is used for diversion while the new conduit is constructed”.<ref name="Conduits through Embankments" />

	“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />		“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />

Grichards at 03:43, 16 September 2022

2022-09-16T03:43:18Z

← Older revision		Revision as of 03:43, 16 September 2022
Line 8:		Line 8:
	“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />		“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />

	~~==Examples==~~
	~~{{Website Icon}}~~
	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}}		{{Document Icon}}[[Technical Manual: Conduits through Embankment Dams (FEMA P-484)\|Technical Manual: Conduits through Embankment Dams (Federal Emergency Management Agency)]]
	~~==Trainings==~~
	~~{{Video Icon}}~~

	<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->		<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->

Rmanwaring: Created page with "NOTOC ---- “When the existing conduit deteriorates to a point where it can no longer serve its intended design purpose, a decision must be made to renovate, remove/replace, or to abandon it. In some cases, the designer may find it technically and economically more feasible to abandon the conduit by grouting it closed and leaving it in place. For instance, abandonment..."

2022-09-06T23:11:26Z

Created page with "__NOTOC__ ----  “When the existing conduit deteriorates to a point where it can no longer serve its intended design purpose, a decision must be made to renovate, remove/replace, or to abandon it. In some cases, the designer may find it technically and economically more feasible to abandon the conduit by grouting it closed and leaving it in place. For instance, abandonment..."

New page

__NOTOC__
----

“When the existing conduit deteriorates to a point where it can no longer serve its intended design purpose, a decision must be made to renovate, remove/replace, or to abandon it. In some cases, the designer may find it technically and economically more feasible to abandon the conduit by grouting it closed and leaving it in place. For instance, abandonment has some advantages over removing the conduit because a large trench is not required to be excavated transverse to the embankment dam. Backfilled excavations in an existing embankment are a source of differential settlement and potential hydraulic fracture. If abandonment is selected, a filter diaphragm or collar should be part of a design to intercept any flow that could potentially occur through defects in the grouted conduit or along the interface between the existing conduit and earthfill”.<ref name="Conduits through Embankments">[[Technical Manual: Conduits through Embankment Dams (FEMA P-484) | FEMA 484 Technical Manual: Conduits through Embankment Dams, FEMA, 2005]]</ref>

“Another possible reason for abandoning an existing conduit would be when a proposed embankment dam raise would result in much higher embankment loads over portions of the conduit. Structural analysis may determine that the higher embankment loads would fail the existing conduit and measures to strength it are not feasible. To prevent failure and to reduce the potential for internal erosion and backward piping erosion of embankment materials, the existing conduit would need to be abandoned and a new conduit constructed. The abandonment of the existing conduit may best be postponed until after the replacement conduit has been constructed and is fully operational. The existing conduit is used for diversion while the new conduit is constructed”.<ref name="Conduits through Embankments" />

“Any abandonment activities should also evaluate the need for partial or full demolition of the entrance and terminal structures, gate houses, plugging of gate chambers and shafts, and removal of certain mechanical equipment. Blasting for demolition should not be permitted. Shaft structures can be backfilled with compacted sand instead of concrete or grout”.<ref name="Conduits through Embankments" />

==Examples==
{{Website Icon}}
==Best Practices Resources==
{{Document Icon}}
==Trainings==
{{Video Icon}}


{{Citations}}


{{revhistinf}}