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How do I Install Landscape Drainage Correctly?

Installing landscape drainage correctly requires a systematic approach involving site assessment, technical planning, and precise execution.

  1. Assessment and Planning: Begin by evaluating the property during rain to identify pooling areas. Use a level to ensure a minimum 2% grade away from structures. Create a layout that incorporates surface features like swales or subsurface options like French drains.
  1. Surface Drainage: Dig shallow trenches (6-12 inches deep) along the yard’s contours. Line them with geotextile fabric, add 2-4 inches of gravel, and install channel drains near foundation edges to manage heavy runoff.
  1. French Drain Installation: Excavate a trench 6-12 inches wide and 18-24 inches deep with a 1% slope toward the outlet. Lay 2 inches of gravel, place perforated pipe, wrap it in landscape fabric to prevent soil intrusion, and backfill with additional gravel and soil.
  1. Integration and Stability: For enhanced performance, connect drains to sump pumps and apply vapor barriers over exposed soil. In areas with unstable soil or erosion risks, helical piles can be driven into the ground to reinforce the foundation.
  1. Testing and Finishing: Before final backfilling, simulate rainfall with a hose to verify flow. Once confirmed, refill trenches in 6-inch layers, compacting each to prevent settling, and restore the surface with seed or sod.

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