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1. Grassed Waterway
Shaping and establishing grass in a natural drainageway to prevent gullies from forming
| How it works |
A natural drainageway is graded and shaped to form a smooth, bowl-shaped channel. This area is seeded to sod-forming grasses. Runoff water that flows down the drainageway flows across the grass rather than tearing away soil and forming a larger gully. An outlet is often installed at the base of the drainageway to stabilize the waterway and prevent a new gully from forming.
| How it helps |
Grass cover protects the drainageway from gully erosion. Vegetation may act as a filter, absorbing some of the chemicals and nutrients in runoff water. Vegetation provides cover for small birds and animals.
| Planning ahead |
Is major land reshaping needed? Is there a proper outlet for surface runoff at the bottom of the waterway? Are soil conservation measures installed to prevent siltation? Will tile drainage be necessary to establish vegetation in the waterway?
| Tech notes |
A waterway should be deep enough and wide enough to carry the peak runoff from a ten-year frequency, 24 hour storm. Check NRCS design charts.
Plant seed at recommended time and rates. Place seed about 1/4 to 1/2 inch deep. Plant across the area or in a figure 8 pattern to reduce erosion.
A nurse crop, temporary cover or mulching may be necessary until permanent cover is established.
| Maintenance |
Lift implements out of the ground and shut off spray equipment when crossing.
Don't use the waterway as a roadway.
Fertilize as needed. § Mow periodically, but wait until July 15 so young birds have a chance to leave the nest.
Maintain the width of the grass area when tilling surrounding fields.
Avoid planting end rows along the waterway. This prevents a new gully forming on the outside edges of the waterway.