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2. Grade Control Structure
Earthen, wooden, concrete or other structure built across drainageway to prevent gully erosion.
| How it works |
A dam, embankment or other structure built across a grassed waterway or existing gully controls and reduces water flow. The structure drops water from one stabilized grade to another and prevents overfall gullies from advancing up a slope.
| How it helps |
Grade control structures are often used to stabilize the outlet of a waterway, preventing gully erosion.
Grassed, non-eroding waterways made possible with a grade control structure give better water quality, can be crossed with equipment, and look better than non-stabilized gullies.
If it is planned to store water, a grade control structure may provide a water source and habitat for wildlife.
| Planning ahead |
Are adequate conservation practices installed above the structure to prevent sedimentation?
Is the planned location in the proper place to achieve the level of control you want?
| Tech notes |
Ask NRCS for design and construction specifications.
Obtain necessary easements or permits
Remove all trees and shrubs within approximately 50 feet downstream from the spillway outlet.
| Maintenance |
Keep burrowing animals off of earthen structures.
Repair any cracks in concrete.
Keep outlets free of debris.