Solution: Diversion

Diversion:  An earthen embankment and channel, similar to a terrace, constructed across a slope to collect water, divert it to a stable outlet, and protect an area downslope.

How it Works

A diversion keeps excess runoff away from areas with concentrated pollutants such as barnyards or feedlots and fields with easily eroded soils. A diversion at the base of a slope can help keep bottom lands drier and more productive. Similar to terraces, the permanent vegetation on a diversion provides habitat for birds and small animals.

Planning

• A diversion and its outlet should be able to handle the peak runoff from a 10-year, 24-hour storm. (A diversion protecting animal lots or manure storage areas should handle the 25-year, 24-hour storm.)
• Suitable outlets for a diversion include a grass waterway, an underground tile outlet or a grade stabilization structure.  Vegetated outlets should be constructed before the diversion is constructed.
• The top of a diversion should be at least four feet wide.
• In erodible areas, soil conservation measures will be needed to keep the diversion from filling with sediment.
• Consider a filter strip above the diversion to trap sediment and protect the diversion.

Maintenance

• Keep outlets clear of sediment and debris.
• Maintain vegetation on the diversion ridge; fertilize as needed.
• Control burrowing animals in the diversion.
• Do not use the diversion as a road.
• Delay mowing until after July 15 to protect ground-nesting birds.

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