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Water and Sediment Control Basin
A short earthen dam built across a drainageway where a terrace is impractical;
usually part of a terrace system.
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How it works
An embankment is built across a depressional area of concentrated water runoff to act similar
to a terrace. It traps sediment and water running off farmland above the structure,
preventing it from reaching farmland below.
How it helps
 Basins improve water quality by trapping sediment on uplands and
preventing it from reaching water bodies.
Structures reduce gully erosion by controlling water flow within a
drainage area.
Grass cover may provide habitat for wildlife.
Planning ahead
Will basins be part of an existing terrace system?
Is the site too steep for the basin to work properly or be economically
feasible?
Can adequate outlets be provided?
Tech notes
The uncontrolled area draining into the basin must not exceed 50 acres. *
Build the basin large enough to control the runoff from a 10-year storm
without overtopping.
Install a tile or infiltration outlet. *
Use fill material free if sod, roots, frozen materials and stones larger
than 6 inches in diameter. It should also have correct moisture content
for adequate compaction.
Spacing for water and sediment control basins depends on the land
slope, tillage and management system. Consult NRCS for recommended
spacing.
Maintenance
Reseed and fertilize as needed to maintain vegetative cover.
Check the basin after each large storm, and make any needed repairs.
* Check local recommendations.
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