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. 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.