guide along the course of the construction. In 1980, archaeologist Klaus Grewe (de) completely mapped out the location line and added it to the official German topographic map. His Atlas der römischen Wasserleitungen nach Köln (Atlas of Roman Aqueducts to Cologne, 1986) is a standard work for researchers in Roman architecture. The Eifel aqueduct is a very important and valuable archaeological site, particularly for the study of Roman surveying, organizational ability, and engineering know-how. It is also a poignant symbol for the loss of technical knowledge during the decline of civilisations that between the Middle Ages and more recent times, no better use was found for the aqueduct than as a stone quarry. The Roman level of technology in this area was not equalled until the 19th and 20th centuries. Footnotes Sources Grewe, Klaus. Der Römerkanalwanderweg. Eifelverein Düren. . Grewe, Klaus. Atlas der römischen Wasserleitungen nach Köln. Rheinland-Verlag. . Haberey, Waldemar. Die römischen Wasserleitungen nach Köln. Rheinland-Verlag, 1971. . Hodge, Trevor. Roman Aqueducts and Water Supply. London: Duckworth, 2002. . Jeep, John M. Medieval Germany: An Encyclopedia. Routledge, 2001. . Lewis, M.J.T. Surveying Instruments of Greece and Rome. Cambridge University, 2001. . Pörtner, Rudolf. Mit dem Fahrstuhl in die Römerzeit. Moewig, Rastatt 2000. . Tegethoff, F. Wolfgang; Rohleder, Johannes; Kroker, Evelyn. Calcium Carbonate: From the Cretaceous Period Into the 21st Century. Birkhäuser, 2001. . Bedoyere, Guy de la. English Heritage Book of Roman Towns in Britain. Rowman & Littlefield, 1992. . See also Roman aqueducts Roman engineering Roman technology External links List of Roman aqueducts 600 Roman aqueducts with 100 descriptions in detail, among which the aqueduct of Köln More on the aqueduct Römerkanal-Wanderweg Foundation for the preservation of the aqueduct Reconstructed aqueduct bridge near Mechernich 80 Buildings and structures completed in the 1st century Roman aqueducts outside Rome Aqueducts in Germany Archaeological sites in Germany Buildings and structures in North Rhine-Westphalia History of Cologne Ancient Roman buildings and structures in Germany Eifel in the Roman era