Below is a summary of interesting links.
- www.icid.org - Worldwide organisation for irrigation and drainage
- www.ilri.nl - Dutch research institute for drainage
- www.drainagecontractor.com -US publication for drainage contractors
- www.interdrain.com - Interdrain manufactures drain-laying machines
- www.consoil.se - Consoil supplies equipment for inspecting drain depths
- www.homburg-holland.com - Homepage HOMBURG MACHINEHANDEL BV
- www.herder.nl - Herder is a supplier of machines for ditch maintenance