service · Chattanooga, Tennessee
Managing Yard Drainage and Surface Runoff
Effective yard drainage involves redirecting water away from structures and managing flow across the property. Solutions range from regrading and swales to engineered collection systems, depending on soil type and site topography.
Identifying Surface Runoff Issues
Common symptoms include ponding in valley-bottom areas, erosion at the toe of slopes, or water accumulating near foundations. These issues often arise from concentrated runoff from roofs, driveways, or higher neighboring ground.
Possible causes of standing water include compacted fill or restrictive soil, but those conditions cannot be assumed from a regional label. A site-specific evaluation is needed before selecting an infiltration or conveyance system.
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Surface Management Tools
Tools such as swales, berms, and regrading can redirect or spread runoff. Stabilization and downstream effects are critical considerations, especially on sloping lots.
Catch basins and channel drains collect concentrated surface flow but require regular sediment and debris maintenance to function correctly.
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Infiltration and Soil Testing
Chattanooga's guidance requires mapping water movement and conducting infiltration testing before designing systems. Regional soil labels do not predict performance at an individual house.
Rain gardens are a viable option for some sites but must be located where captured water drains in less than 72 hours and at least 10 feet from buildings.
Permitting and Safety
Excavation for drainage work may trigger a Land Disturbing Permit if the activity covers 1,000 square feet or more. Users should verify thresholds with the city before starting.
Tennessee 811 must be contacted at least three full business days prior to any digging to ensure utility lines are marked.
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Frequently asked questions
What causes water to collect in a yard after heavy rain?
Water may collect due to concentrated runoff from roofs or driveways, ponding in flat areas, erosion on slopes, or poor surface grading near the building.
Can I install a rain garden anywhere in my yard?
No. Rain gardens should be located at least 10 feet from buildings and in areas where captured water drains in less than 72 hours.
Do catch basins require maintenance?
Yes. Catch basins and channel drains collect sediment and debris, which must be removed regularly to prevent blockages and ensure proper function.
When do I need a Land Disturbing Permit for drainage work?
A permit may be required if the land-disturbing activity covers 1,000 square feet or more. The city determines specific requirements based on the project scope.