These outlets have an advantage over grass waterways in that they are easy to maintain and do not remove land from production. Grass waterways, however, are less expensive to construct. Grassed Waterways Used alone or as outlets for terraces or other diversion structures, grassed waterways provide for the controlled release of runoff water along natural drainage ways. They are constructed by grading and shaping the drainage way so as to reduce the erosive force of runoff water. Grasses that tolerate running water are planted to diminish the water's force, anchor and protect the soil, and filter out sediment.
Grassed waterways allow the producer to cross the natural drainage ways in the field with equipment.
This saves time spent on avoiding deep gullies or repairing damage caused by unrestricted runoff. They also make excellent boundaries between crops, provide nesting cover for wildlife, and may be judiciously used for grazing or hay production. The cost of installing grassed waterways depends on the degree and length of slope, the amount of erosion repair and grading needed, and the difficulty encountered in establishing adequate grass cover. To stimulate new growth and control weeds, mow and rake waterways several times a season. Remove accumulations of sediment to avoid smothering vegetation and restricting the capacity of the waterway.