Grichards at 03:23, 2 December 2022

2022-12-02T03:23:44Z

← Older revision		Revision as of 03:23, 2 December 2022
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	Selecting appropriate materials for filters and drains is a crucial component of successful embankment repairs and construction. A couple questions to ask yourself:		[[Category:Filters and Drains Outlet Works]]
			Selecting appropriate materials for filters and drains is a crucial component of successful embankment repairs and [[construction]]. A couple questions to ask yourself:

	#Do I have materials suitable for construction?		#Do I have materials suitable for construction?

Grichards at 20:55, 15 September 2022

2022-09-15T20:55:19Z

← Older revision		Revision as of 20:55, 15 September 2022
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	[[Typical Filter and Drain Configurations]]		[[Typical Filter and Drain Configurations]]


			''Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.''
	[[Category:Example Pages]]		[[Category:Example Pages]]
	{{Revhistinf}}		{{Revhistinf}}

Camrenbt: Created page with "Selecting appropriate materials for filters and drains is a crucial component of successful embankment repairs and construction. A couple questions to ask yourself: #Do I have materials suitable for construction? #Have I sized the filters and drains properly?
==On-site Materials== '''It is rare to find natural materials that can satisfactorily serve as filters. The filter and drain materials will likely need to be imported. Why are on-site materials unsuitable for..."

2022-06-27T17:34:45Z

Created page with "Selecting appropriate materials for filters and drains is a crucial component of successful embankment repairs and construction. A couple questions to ask yourself: #Do I have materials suitable for construction? #Have I sized the filters and drains properly? </br> ==On-site Materials== '''It is rare to find natural materials that can satisfactorily serve as filters. The filter and drain materials will likely need to be imported. Why are on-site materials unsuitable for..."

New page

Selecting appropriate materials for filters and drains is a crucial component of successful embankment repairs and construction. A couple questions to ask yourself:

#Do I have materials suitable for construction?
#Have I sized the filters and drains properly?
</br>
==On-site Materials==
'''It is rare to find natural materials that can satisfactorily serve as filters. The filter and drain materials will likely need to be imported.
Why are on-site materials unsuitable for filters?'''
*On-site materials often have variations in gradations and quantities.
*Natural deposits often have coarse particles that don't meet the filter requirements necessary to prevent segregation.
*Natural materials typically contain clay/silt particles, which decreases permeability dramatically. A soil with as little as 7% clay can be essentially impermeable.
'''Is processing on-site materials an option?'''
*The cost of bringing in new material is likely less than the cost of the additional effort required to test on-site materials and verify material properties during construction.
'''Where can on-site materials be used for cost savings?'''
*If the content of fines is adequate (<5%), there is potential for on-site materials to be used in the shell downstream of the filter.
*On-site materials may be considered for random fill used in the top couple feet of the dam within the freeboard zone.

==Filter and Drain Materials==
Modern practice and guidelines dictate the use of zoned embankments that include, at a minimum, engineered filters downstream of earth cores and around conduit penetrations and toe drains. Engineered filters include single stage and two stage filter configurations. Two stage configurations include a filter layer and drain that offer greater protection against concentrated flows and the potential for seepage that can occur at contaminations in the filter layer.

'''Sand Filter'''
*Provides a barrier between the core of the dam and the downstream shell. The sand filter captures flow traveling through the embankment and prevents the movement of soil particles.
'''Drain Rock'''
*Accommodates any concentrated seepage that is greater than the capacity of the filter layer.
[[Typical Filter and Drain Configurations]]

[[Category:Example Pages]]
{{Revhistinf}}

Soils - Revision history

Grichards at 03:23, 2 December 2022

Grichards at 20:55, 15 September 2022