Solution: Grade Stabilization Structures

Grade Stabilization Structure:  An earthen, concrete or other structure built across a drainageway to prevent gully erosion.

How it Works

A dam or embankment built across a gully or grass waterway drops water to a lower elevation while protecting the soil from gully erosion or scouring. Structures are typically either a drop spillway or a small dam and basin with a pipe outlet.

Planning

• Pipe outlet structures are typically used if the area upstream of the dam can temporarily hold most of the water from a storm. Drop structures are used where the area upstream of the site has minimal storage capacity.
• Grade stabilization structures can be expensive to install and should always be designed by a qualified person.
• If planned to store water, a grade stabilization structure can also provide a water source and habitat for wildlife.
• Adequate soil conservation practices are needed upstream of the structure to avoid sedimentation.
• Check to see if any permits are required.

Maintenance

• Remove trees and shrubs within 30 feet of the structure.
• Keep burrowing animals away from earthen structures.
• Repair cracks in concrete.
• Keep inlets, outlets and the area 50 feet downstream of the outlet free of debris.

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