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French drain installation

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Any response to these issues is gratly appreciated.

What is the standard of care for installing a 4" dia. french drain
along a 70 foot-long by 9 foot high masonry retaining wall?
Are there any gravel or crushed rock specific requirements?
What is the minimum slope required by the standard of care?
Is a 1/4" slope appropriate?

Thank you in advance.

Desi J. Kiss, MS, PE
Phone: 949/458-9169
E-mail: djkiss55(--nospam--at)juno.com

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