sentences:  Schistosomiasis (a disease caused by parasitic worms) has been found in irrigation canals along with benthic cyanobacteria forming mats.Agriculture is the largest consumer of water in Egypt using about 85% of available water.Drainage water from the agricultural fields contains pollutants such as pesticide residues, toxic organic and inorganic pollutants, salts and treated and untreated domestic wastewater.