Other Subsurface Drainage Websites
University of Minnesota: https://extension.umn.edu/crop-production/agricultural-drainage
Iowa State University: http://agwatermgmt.ae.iastate.edu
Ohio State University, Wetland Reservoir Subirrigation: https://www.ars.usda.gov/ARSUserFiles/50800000/WRSISfactsheet.pdf
University of Illinois: http://web.extension.illinois.edu/bioreactors/
Michigan State University - https://www.egr.msu.edu/bae/water/drainage/
Purdue University: https://engineering.purdue.edu/SafeWater/Drainage/
Agricultural Drainage Management Coalition: http://admcoalition.com
Transforming Drainage: https://transformingdrainage.org