Drainage Channel Excavation Machinery Barreto Manufacturing, USA. Cosmeco, Italy. Siam Implement Co., Thailand. Miles Drainage, UK. Dondi, Italy. Hemos, Netherlands. Boelter, Brazil. MPH Products, Finland. John Berends, Australia. Drainage Channel Excavation Machinery Agricultural drainage channel excavation machinery refers to the specialized equipment used to dig and maintain channels or trenches in agricultural fields for the purpose of removing excess water and managing soil moisture.