Here is something there doing here in Iowa.I have not seen one but there are a couple dozen in the state, designed by the nrcs. They dig a trench 8 to10 feet wide and up to 8 feet deep line it with plastic, put drainage tile in and fill it with wood chips,they can be 100 to 500 feet long. they claim thus far to show 40-90% reductions in chemical and fertilizer runoff and expect them to have a 8-10 year life. although not real cost effective for the average guy, they can run from several thousand to over 20 k. It could be an alternative for someone with deep pockets.I do not think there is any cost sharing at this time.
