Natural Resource Conservation Service Electronic Field Office Technical Guides (eFOTG) – www.nrcs.usda.gov/technical/efotg/
Indiana Drainage Handbook – http://www.in.gov/dnr/water/4892.htm
Indiana Storm Water Quality Manual – https://www.in.gov/idem/stormwater/2363.htm
National Management Measures to Control Nonpoint Source Pollution – https://www.epa.gov/nps/national-management-measures-control-nonpoint-source-pollution-agriculture