Category:605 Underdrainage - Revision history

Smithk: /* 605.1.2 Types of Underdrains */Per CM, removed the archaic reference to "rehabilitation strategies". No additional revision needed since the last year geocomposite edge drains were specified in a set of plans was 2009.

2018-11-06T14:10:26Z

605.1.2 Types of Underdrains: Per CM, removed the archaic reference to "rehabilitation strategies". No additional revision needed since the last year geocomposite edge drains were specified in a set of plans was 2009.

← Older revision		Revision as of 09:10, 6 November 2018
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	'''French Underdrains.''' French underdrains consist of fabric wrapped, coarse porous backfill in a trenched installation. No pipe is used except for a short length of metal pipe as an outlet. Functionally, this is an interception type drain.		'''French Underdrains.''' French underdrains consist of fabric wrapped, coarse porous backfill in a trenched installation. No pipe is used except for a short length of metal pipe as an outlet. Functionally, this is an interception type drain.

	'''Geocomposite Pavement Edge Drains.''' Geocomposite pavement edge drains consist of a geotextile wrapped plastic core or drainage medium that is installed in a narrow trench along the edge of pavements being rehabilitated that meet certain criteria~~. See [[:Category:451 Rehabilitation Strategies\|Rehabilitation Strategies]] for the details of using geocomposite edge drains in pavement rehabilitation projects~~.		'''Geocomposite Pavement Edge Drains.''' Geocomposite pavement edge drains consist of a geotextile wrapped plastic core or drainage medium that is installed in a narrow trench along the edge of pavements being rehabilitated that meet certain criteria.

	===605.1.3 Location and Use of Underdrains===		===605.1.3 Location and Use of Underdrains===

Smithk: /* 605.1.3 Location and Use of Underdrains */

2018-09-28T14:01:00Z

605.1.3 Location and Use of Underdrains

← Older revision		Revision as of 09:01, 28 September 2018
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	All new rigid and flexible pavements, light, medium, or heavy duty, are to be provided with 12 in. or 18 in. of rock base in the top of the subgrade whenever available in suitable quantities on or in close proximity to the job.		All new rigid and flexible pavements, light, medium, or heavy duty, are to be provided with 12 in. or 18 in. of rock base in the top of the subgrade whenever available in suitable quantities on or in close proximity to the job.

	Pavement cross drains are designed with a minimum fall of at least one and preferably 2 percent or more and an outlet at least 6 in. (150 mm) and preferably 12 in. (300 mm) above the ditch flow line. The cross drains are skewed to obtain the necessary fall and clearance. The roadway ditch should be deepened to meet these requirements if necessary. Pavement edge drains are designed with flow lines paralleling the pavement and base grades and with outlets on their respective side of the pavement unless it is absolute necessary to carry the water beneath the pavement to an outlet. See [~~http~~://www.modot.~~state.mo.us~~/~~business~~/~~standards_and_specs/documents/60510.pdf~~ Standard Plan 605.10] for details concerning outlet location and spacing.		Pavement cross drains are designed with a minimum fall of at least one and preferably 2 percent or more and an outlet at least 6 in. (150 mm) and preferably 12 in. (300 mm) above the ditch flow line. The cross drains are skewed to obtain the necessary fall and clearance. The roadway ditch should be deepened to meet these requirements if necessary. Pavement edge drains are designed with flow lines paralleling the pavement and base grades and with outlets on their respective side of the pavement unless it is absolute necessary to carry the water beneath the pavement to an outlet. See [https://www.modot.org/media/16855 Standard Plan 605.10] for details concerning outlet location and spacing.

	==605.2 Construction Inspection==		==605.2 Construction Inspection==

EPGsysop: /* 605.4.2 Underdrain Installation */

2017-04-07T18:49:03Z

605.4.2 Underdrain Installation

← Older revision		Revision as of 13:49, 7 April 2017
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	===605.4.2 Underdrain Installation===		===605.4.2 Underdrain Installation===
	The depth of underdrains should be ~~such~~ that all seepage is intercepted. In some cases, this will require advice from the district geologist and core drillings to determine water level or seepage veins. The excavated trench should allow for a minimum of 4 inches of granular backfill on each side of the pipe and 2 inches below the pipe. Highly unstable soils such as in slide areas, may require a V-shaped trench or a shored up trench depending on the depth of excavation. Outlets of drains in cuts should be a minimum of 6 inches above the bottom of the roadside ditch.		The depth of underdrains should be so that all seepage is intercepted. In some cases, this will require advice from the district geologist and core drillings to determine water level or seepage veins. The excavated trench should allow for a minimum of 4 inches of granular backfill on each side of the pipe and 2 inches below the pipe. Highly unstable soils such as in slide areas, may require a V-shaped trench or a shored up trench depending on the depth of excavation. Outlets of drains in cuts should be a minimum of 6 inches above the bottom of the roadside ditch.

	The size of underdrain pipe depends on the drainage capacity required. Perforated pipe is available in 6, 8, 10, 12, 15 and 18 inch diameters.		The size of underdrain pipe depends on the drainage capacity required. Perforated pipe is available in 6, 8, 10, 12, 15 and 18 inch diameters.

Smithk: /* 605.1.3 Location and Use of Underdrains */ Per CM, 12" rock base option provided to bring guidance into compliance with current practice on particle dimensions, material placement, etc

2013-10-31T12:12:37Z

605.1.3 Location and Use of Underdrains: Per CM, 12" rock base option provided to bring guidance into compliance with current practice on particle dimensions, material placement, etc

← Older revision		Revision as of 07:12, 31 October 2013
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	It is also entirely possible that locations for cross drains may be specified which will prove to be unnecessary. In any case, details for underdrains required for known conditions, other than those shown on the standard plans, are shown on the design plans based on the best information available at the time the plans are prepared.		It is also entirely possible that locations for cross drains may be specified which will prove to be unnecessary. In any case, details for underdrains required for known conditions, other than those shown on the standard plans, are shown on the design plans based on the best information available at the time the plans are prepared.

	Pavement edge drains are required for new rigid or flexible pavements on medium and heavy duty routes, and permeable base courses will be provided on all heavy duty pavements with the following exceptions. Pavement edge drains and permeable base courses are not required where a minimum of 18 in. ~~(0.45 m)~~ of daylighted rock base can be furnished for the top of the subgrade or where hydraulically placed sand fill comprises the top 4 ft. (1.2 m) of the embankment with not more than 2 ft. (0.6 m) of soil cap on the slopes. Thin courses of permeable bases cannot be relied upon to provide permanent drainage when daylighted and should never be used without pavement edge drains.		Pavement edge drains are required for new rigid or flexible pavements on medium and heavy duty routes, and permeable base courses will be provided on all heavy duty pavements with the following exceptions. Pavement edge drains and permeable base courses are not required where a minimum of 12 in. or 18 in. of daylighted rock base can be furnished for the top of the subgrade or where hydraulically placed sand fill comprises the top 4 ft. (1.2 m) of the embankment with not more than 2 ft. (0.6 m) of soil cap on the slopes. Thin courses of permeable bases cannot be relied upon to provide permanent drainage when daylighted and should never be used without pavement edge drains.

	All new rigid and flexible pavements, light, medium, or heavy duty, are to be provided with 18 in. ~~(0.45 m)~~ of rock base in the top of the subgrade whenever available in suitable quantities on or in close proximity to the job.		All new rigid and flexible pavements, light, medium, or heavy duty, are to be provided with 12 in. or 18 in. of rock base in the top of the subgrade whenever available in suitable quantities on or in close proximity to the job.

	Pavement cross drains are designed with a minimum fall of at least one and preferably 2 percent or more and an outlet at least 6 in. (150 mm) and preferably 12 in. (300 mm) above the ditch flow line. The cross drains are skewed to obtain the necessary fall and clearance. The roadway ditch should be deepened to meet these requirements if necessary. Pavement edge drains are designed with flow lines paralleling the pavement and base grades and with outlets on their respective side of the pavement unless it is absolute necessary to carry the water beneath the pavement to an outlet. See [http://www.modot.state.mo.us/business/standards_and_specs/documents/60510.pdf Standard Plan 605.10] for details concerning outlet location and spacing.		Pavement cross drains are designed with a minimum fall of at least one and preferably 2 percent or more and an outlet at least 6 in. (150 mm) and preferably 12 in. (300 mm) above the ditch flow line. The cross drains are skewed to obtain the necessary fall and clearance. The roadway ditch should be deepened to meet these requirements if necessary. Pavement edge drains are designed with flow lines paralleling the pavement and base grades and with outlets on their respective side of the pavement unless it is absolute necessary to carry the water beneath the pavement to an outlet. See [http://www.modot.state.mo.us/business/standards_and_specs/documents/60510.pdf Standard Plan 605.10] for details concerning outlet location and spacing.

EPG-Admin at 19:00, 10 April 2008

2008-04-10T19:00:15Z

← Older revision		Revision as of 14:00, 10 April 2008
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	All new rigid and flexible pavements, light, medium, or heavy duty, are to be provided with 18 in. (0.45 m) of rock base in the top of the subgrade whenever available in suitable quantities on or in close proximity to the job.		All new rigid and flexible pavements, light, medium, or heavy duty, are to be provided with 18 in. (0.45 m) of rock base in the top of the subgrade whenever available in suitable quantities on or in close proximity to the job.

	Pavement cross drains are designed with a minimum fall of at least one and preferably 2 percent or more and an outlet at least 6 in. (150 mm) and preferably 12 in. (300 mm) above the ditch flow line. The cross drains are skewed to obtain the necessary fall and clearance. The roadway ditch should be deepened to meet these requirements if necessary. Pavement edge drains are designed with flow lines paralleling the pavement and base grades and with outlets on their respective side of the pavement unless it is absolute necessary to carry the water beneath the pavement to an outlet. See [~~http://~~http://www.modot.state.mo.us/business/standards_and_specs/documents/60510.pdf Standard Plan 605.10] for details concerning outlet location and spacing.		Pavement cross drains are designed with a minimum fall of at least one and preferably 2 percent or more and an outlet at least 6 in. (150 mm) and preferably 12 in. (300 mm) above the ditch flow line. The cross drains are skewed to obtain the necessary fall and clearance. The roadway ditch should be deepened to meet these requirements if necessary. Pavement edge drains are designed with flow lines paralleling the pavement and base grades and with outlets on their respective side of the pavement unless it is absolute necessary to carry the water beneath the pavement to an outlet. See [http://www.modot.state.mo.us/business/standards_and_specs/documents/60510.pdf Standard Plan 605.10] for details concerning outlet location and spacing.

	==605.2 Construction Inspection==		==605.2 Construction Inspection==

EPG-Admin: revise wording of links to match article names

2008-02-28T15:41:20Z

revise wording of links to match article names

← Older revision		Revision as of 10:41, 28 February 2008
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	==605.3 Materials Inspection==		==605.3 Materials Inspection==
	See related materials requirements in [[:Category:1009 Aggregate for Drainage\|Aggregate for Drainage]], [[:Category:1011 Geotextile\|Geotextile]], [[:Category:1012 Geocomposite Drainage Material\|Geocomposite Edge Drain]], [[:Category:1013 Miscellaneous Drainage Material\|Outlet Pipes]], [[:Category:1013 Miscellaneous Drainage Material\|Pipe Aggregate ~~pavement~~ Edge Drain]], [[:Category:1022 Corrugated Metallic-Coated Steel Pipe Underdrain\|Corrugated Metallic-Coated Steel ~~Cross Drain and Structural Drain~~ Pipe]], or [[:Category:1025 Corrugated Aluminum Alloy Pipe Underdrains\|Corrugated Aluminum Alloy ~~Cross Drain and Structural Drain~~ Pipe]].		See related materials requirements in [[:Category:1009 Aggregate for Drainage\|Aggregate for Drainage]], [[:Category:1011 Geotextile\|Geotextile]], [[:Category:1012 Geocomposite Drainage Material\|Geocomposite Edge Drain]], [[:Category:1013 Miscellaneous Drainage Material\|Outlet Pipes]], [[:Category:1013 Miscellaneous Drainage Material\|Pipe Aggregate Pavement Edge Drain]], [[:Category:1022 Corrugated Metallic-Coated Steel Pipe Underdrain\|Corrugated Metallic-Coated Steel Pipe Underdrain]], or [[:Category:1025 Corrugated Aluminum Alloy Pipe Underdrains\|Corrugated Aluminum Alloy Pipe Underdrain]].

	==605.4 Maintenance Activities==		==605.4 Maintenance Activities==

EPG-Admin: revise wording of links to enable them

2008-02-28T15:12:59Z

revise wording of links to enable them

← Older revision		Revision as of 10:12, 28 February 2008
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	==605.3 Materials Inspection==		==605.3 Materials Inspection==
	See related materials requirements in [[:Category:1009 Aggregate for Drainage\|Aggregate for Drainage]], [[:Category:1011 Geotextile\|Geotextile]], [[:Category:1012 Geocomposite ~~Edge Drain~~\|Geocomposite Edge Drain]], [[:Category:1013 ~~Outlet Pipes~~\|Outlet Pipes]], [[:Category:1013 ~~Pipe Aggregate pavement Edge Drain~~\|Pipe Aggregate pavement Edge Drain]], [[:Category:1022 Corrugated Metallic-Coated Steel ~~Cross Drain and Structural Drain~~ Pipe\|Corrugated Metallic-Coated Steel Cross Drain and Structural Drain Pipe]], or [[:Category:1025 Corrugated Aluminum Alloy ~~Cross Drain and Structural Drain~~ Pipe\|Corrugated Aluminum Alloy Cross Drain and Structural Drain Pipe]].		See related materials requirements in [[:Category:1009 Aggregate for Drainage\|Aggregate for Drainage]], [[:Category:1011 Geotextile\|Geotextile]], [[:Category:1012 Geocomposite Drainage Material\|Geocomposite Edge Drain]], [[:Category:1013 Miscellaneous Drainage Material\|Outlet Pipes]], [[:Category:1013 Miscellaneous Drainage Material\|Pipe Aggregate pavement Edge Drain]], [[:Category:1022 Corrugated Metallic-Coated Steel Pipe Underdrain\|Corrugated Metallic-Coated Steel Cross Drain and Structural Drain Pipe]], or [[:Category:1025 Corrugated Aluminum Alloy Pipe Underdrains\|Corrugated Aluminum Alloy Cross Drain and Structural Drain Pipe]].

	==605.4 Maintenance Activities==		==605.4 Maintenance Activities==

EPG-Admin: correct spelling of "strategies"

2008-02-28T15:06:32Z

correct spelling of "strategies"

← Older revision		Revision as of 10:06, 28 February 2008
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	'''French Underdrains.''' French underdrains consist of fabric wrapped, coarse porous backfill in a trenched installation. No pipe is used except for a short length of metal pipe as an outlet. Functionally, this is an interception type drain.		'''French Underdrains.''' French underdrains consist of fabric wrapped, coarse porous backfill in a trenched installation. No pipe is used except for a short length of metal pipe as an outlet. Functionally, this is an interception type drain.

	'''Geocomposite Pavement Edge Drains.''' Geocomposite pavement edge drains consist of a geotextile wrapped plastic core or drainage medium that is installed in a narrow trench along the edge of pavements being rehabilitated that meet certain criteria. See [[:Category:451 Rehabilitation ~~Stragegies~~\|Rehabilitation ~~Stragegies~~]] for the details of using geocomposite edge drains in pavement rehabilitation projects.		'''Geocomposite Pavement Edge Drains.''' Geocomposite pavement edge drains consist of a geotextile wrapped plastic core or drainage medium that is installed in a narrow trench along the edge of pavements being rehabilitated that meet certain criteria. See [[:Category:451 Rehabilitation Strategies\|Rehabilitation Strategies]] for the details of using geocomposite edge drains in pavement rehabilitation projects.

	===605.1.3 Location and Use of Underdrains===		===605.1.3 Location and Use of Underdrains===

EPG-Admin at 14:06, 21 November 2006

2006-11-21T14:06:37Z

← Older revision		Revision as of 09:06, 21 November 2006
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	==605.4 Maintenance Activities==		==605.4 Maintenance Activities==

	===General===		===605.4.1 General===
	Underdrains are placed for base drainage, to remove excessive ground water and as interception drains in unstable soil to prevent slides. Underdrains placed at the time of construction are marked at the outlet ends with "Drain" markers on steel posts and any placed by maintenance should be marked in the same manner. It may be necessary for maintenance forces to place underdrains but these must be approved by the district maintenance and traffic engineer. It is recommended that the district geologist be consulted in exceptional cases. Underdrain outlets shall be cleaned out as necessary to provide drainage away from the ends of the pipe.		Underdrains are placed for base drainage, to remove excessive ground water and as interception drains in unstable soil to prevent slides. Underdrains placed at the time of construction are marked at the outlet ends with "Drain" markers on steel posts and any placed by maintenance should be marked in the same manner. It may be necessary for maintenance forces to place underdrains but these must be approved by the district maintenance and traffic engineer. It is recommended that the district geologist be consulted in exceptional cases. Underdrain outlets shall be cleaned out as necessary to provide drainage away from the ends of the pipe.

	===Underdrain Installation===		===605.4.2 Underdrain Installation===
	The depth of underdrains should be such that all seepage is intercepted. In some cases, this will require advice from the district geologist and core drillings to determine water level or seepage veins. The excavated trench should allow for a minimum of 4 inches of granular backfill on each side of the pipe and 2 inches below the pipe. Highly unstable soils such as in slide areas, may require a V-shaped trench or a shored up trench depending on the depth of excavation. Outlets of drains in cuts should be a minimum of 6 inches above the bottom of the roadside ditch.		The depth of underdrains should be such that all seepage is intercepted. In some cases, this will require advice from the district geologist and core drillings to determine water level or seepage veins. The excavated trench should allow for a minimum of 4 inches of granular backfill on each side of the pipe and 2 inches below the pipe. Highly unstable soils such as in slide areas, may require a V-shaped trench or a shored up trench depending on the depth of excavation. Outlets of drains in cuts should be a minimum of 6 inches above the bottom of the roadside ditch.

EPG-Admin at 13:24, 21 November 2006

2006-11-21T13:24:56Z

← Older revision		Revision as of 08:24, 21 November 2006
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	==605.4 Maintenance Activities==		==605.4 Maintenance Activities==

			===General===
			Underdrains are placed for base drainage, to remove excessive ground water and as interception drains in unstable soil to prevent slides. Underdrains placed at the time of construction are marked at the outlet ends with "Drain" markers on steel posts and any placed by maintenance should be marked in the same manner. It may be necessary for maintenance forces to place underdrains but these must be approved by the district maintenance and traffic engineer. It is recommended that the district geologist be consulted in exceptional cases. Underdrain outlets shall be cleaned out as necessary to provide drainage away from the ends of the pipe.

			===Underdrain Installation===
			The depth of underdrains should be such that all seepage is intercepted. In some cases, this will require advice from the district geologist and core drillings to determine water level or seepage veins. The excavated trench should allow for a minimum of 4 inches of granular backfill on each side of the pipe and 2 inches below the pipe. Highly unstable soils such as in slide areas, may require a V-shaped trench or a shored up trench depending on the depth of excavation. Outlets of drains in cuts should be a minimum of 6 inches above the bottom of the roadside ditch.

			The size of underdrain pipe depends on the drainage capacity required. Perforated pipe is available in 6, 8, 10, 12, 15 and 18 inch diameters.

			All perforated underdrain pipe within granular backfill shall be laid with the perforations down. Outside the limits of granular backfill the perforations should be up and covered with two layers of tar paper or be pipe that is not perforated. If perforated vitrified clay pipe is used all joints must be filled with mortar.

			Backfill material for perforated pipe should be a coarse graded sand such as concrete sand to at least one foot above the top of the pipe. Creek gravel with a high percentage of fines may be used above this height to fill the remainder of the trench. The trench should then be capped with clay or other impervious material. Backfill material must permit ready flow of water and keep fine soil from entering and clogging the subdrain. Bell Joint vitrified clay pipe without perforations is not recommended but if used a coarse backfill material must surround the pipe to prevent the fine filter material from entering and clogging the system.

			Standard design and construction specifications will provide additional information regarding underdrain installations.