Water supply and wastewater disposal Koch's main work was in the field of Water supply and wastewater disposal.
Hager (2014) summarized: :"Koch was responsible for both the water supply and the wastewater disposal of the Seine Department, including the French capital. His 1937 book on the sanitation of agglomerations saw various re-editions, as also his second book Sewer networks, first published in 1954. Besides, Koch also translated the city sanitation book of
Karl Imhoff (1876–1965) into French. He further contributed various papers to sewer hydraulics." == Selected publications ==