Garage Flooding: French Drain with Polyethylene Pipe and Gravel

Permanent Drainage Fix for Garage Built Into Garden Slope

Garage back built into garden. Flooding at rear. Dug 1m wide channel around back. Plan: 12-14" trench, 2" gravel, 3-4" polyethylene drain pipe, gravel to top, lateral solid pipe to storm drain.

Expert Plan: Correct

Your plan is solid. Key points:

• Trench along dripline, 12-14" deep
• 2" clean gravel base
• Perforated polyethylene pipe (flexible, durable)
• Fill with gravel to surface
• Solid lateral pipe to outlet (no gravel needed)

This intercepts groundwater before it hits the foundation.