earthworks which include machine and manual excavations, subsoil formation, building embankments, securing embankment slopes and waterway cuts, designing buttoms of waterway beds, transport of earth materials, etc;

works on water drainage which include the excavation of drainage canals and drains with transportation, building concrete curbs, ducts and drain pipes;

stoneworks which include building slopes and stabilizing cut-off trenches by using gabions;

concrete works which include constructing concrete mattresses on the bottom and slopes of river beds, cut-off trenches and bolsters, constructing stabilizing concrete bands, etc.