Results of a Successful French Drain

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Results of a Successful French Drain

By Beauregard Master Gardeners

A French drain system consisting of 4 inch perforated sleeved drain pipe was installed on the east end of the Beauregard Master Garden in DeRidder, Louisiana on October 27.  The depth varied from 8 inches to 20 inches as a sighted laser level for gravity drainage in a South direction.  Gravel was placed below and above the drain pipe along with a tight weave landscape fabric above a portion of the gravel fill.

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Before: Demonstration garden at 7:30 AM.

On November 23 an overnight flooding rain occurred.  Pictures were taken at 7:45 am and then at 4:30 pm for comparison.  Typically rain-water would keep this garden area flooded for several days.  Within 9 hours, the area around the French drain showed minimal surface water.  In other parts of the garden on the west end, water holding low areas were still flooded after the 9-hour lag.  The desired effect of the drain is demonstrated in the photographs.

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After: Demo garden at 4:30 PM of the same day. Photos: George Giltner

The project was necessary to prevent fertilizer leaching, water-logging of soils, fungal and bacterial infections of planted materials, anaerobic acidification, and volatilization of sulfur and nitrogen compounds.

 

 

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