Underground Outlet

What is an Underground Outlet?

An underground outlet is a conservation practice that conveys stormwater through a pipe underground to a reinforced outlet area.

Do you Notice any of these Issues on your Farm?

• Flooding and ponding
• Gully erosion
• Muddy barnyard

Why should you consider installing an underground outlet?

• Improved surface water disposal
• Reduced flooding in barnyard
• Controlled location of water outlets

Other Practices are Associated with Underground Outlets

Underground outlets are part of a comprehensive system involving several conservation practices. The following are some commonly associated practices:

• Roofs and gutters
• Diversions
• Terraces
• Surface drainage systems
• Water and sediment control basins

Many Design Choices are Possible

Underground outlets convey water from an associated stormwater control practice to a stabilized area. The design of an underground outlet will depend on factors such as topography and water flow from the source. The outlet area is typically stabilized with gravel or stone and allows for infiltration of water. Outlets may not be channeled directly into streams. Assistance with design, obtaining permits, and construction is available (see the URLs at the end of this article for more information).

What Maintenance is Required?

Stormwater will flow through the underground outlet during storm events, so maintenance of the outlet may be required. A well-designed outlet will remain stable during a flood event. However, debris or sediment can accumulate in the infiltration area. Use the following maintenance practices to keep the outlet functioning properly:

• Inspect regularly
• Clean and maintain inlets, wildlife guards, and other components to prevent blockages
• Repair or replace damaged components
• Address leaks and breaks

Interested in Having an Underground Outlet?

Underground outlets are eligible for funding through several conservation programs administered by the State Conservation Commission and Natural Resources Conservation Service (NRCS). Costs are determined by the outlet design and construction as well as the permits and regulations. Additionally, several local funding sources may be available through organizations such as County Conservation Districts or local nongovernmental organizations.

For more information, reach out to staff at the Center for Agricultural Conservation Assistance Training, NRCS, or your local conservation district office.

Prepared by Katie DeSa and Jake Tomlinson, Center for Agricultural Conservation Assistance Training