Drains are essential for the development and improvement of many farms. They can help channel surface runoff (and pollutants) from paddocks, reduce flooding and lower the water table.
Drains can also be important habitats for endangered wetland species, such as eel, trout, whitebait and water birds.
Here are some general ideas for managing drains to meet farm objectives while maintaining water quality and habitat for native plants and animals. You should check with your regional council for any local rules pertaining to drain construction and maintenance.