Diversion is an earthen embankment similar to a terrace that directs runoff water from a specific area. 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.
How it helps...
Reduces soil erosion on lowlands by catching runoff water and preventing it from reaching farmland below
Vegetation in the diversion channel filters runoff water, improving water quality
Vegetation provides cover for small birds and animals
Allows better crop growth on bottomland soils
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.
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.