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Wet Backyard With Clay Soil: Drainage and Grass Fixes

Backyard area

The yard slopes well away from the house but stays damp, grows poor grass, and has clay soil. The homeowner plans a privacy fence and concrete patio but needs to solve the wetness first.

Diagnosing the Wetness

Good surface slope rules out grading. Likely causes:

Excessive rainfall
High organic matter holding moisture
Missing gutters dumping roof water
AC condensate or irrigation leak
Side yards shedding water toward the back

Identify the source before acting.

Grass Improvement

Poor topsoil is the probable culprit. Incorporate 1–2 inches of compost, till or rake vigorously, then overseed with a shade-tolerant mix if needed.

— Sean Murphy, Amenity Architects

Landscaping and Design: Planting Shrubs in Slow-Draining Soil; Covering a French Drain in a Clay Yard; Converting a Swampy Backyard into Usable Lawn; Designing a Stone Pathway That Handles Drainage; Naturalizing a Clay-Soil Yard in Greensboro, NC; Designing a French Drain Grid for Clay Soil Yards; Comprehensive Drainage Plan for a Montana Home with Basement Flooding; Drainage Solutions for a Townhouse Backyard With Limited Access; Recurring St. Augustine Brown Patch: Fungus, Bird Seed, or Fertilizer?; Soil Drainage: Testing, Types & Solutions for Healthy Gardens

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