4. Design summary
4.1. System age
The use of wetlands for treating concentrated
animal wastes is a relatively new idea. The oldest
recorded system in North America is the Brenton
cattle operation in Iowa which started in 1930. All
of the other sites are more recent with the oldest
being Sand Mountain, AL, started in 1989; and
the Newton and Hattiesburg, MS, systems started
in 1989. The majority of the other systems started
operating in 1993 and 1994. Newer systems constructed
in 1995 and 1996, may not have been
discovered through the literature review.