Grassed waterways are designed to follow the existing drainage path through a field. with a gentle parabolic shape, crossing a waterway in the dark with large machinery is no longer a scary process.
Following the existing slope of the field, the design width and depth of the waterway is determined by the size of the drainage area and the amount of rain a 24-hour, 25 year rainfall event can produce. the goal is to have the water move slow enough to drop the sediment from the field yet fast enough to keep going without undue saturation.
Grass types to be established within the waterway are producer's choice and can be any sod-forming grass although preference is given to native varieties.
Grassed waterways can be cost shared as a part of a Natural Resource Conservation Service EQIP conservation plan or as a stand alone project. typical cost share rates are at 75%.