Ulf Richter was a German researcher who was a regular contributor to the Atlantis Rising forums and presented a paper^(a) to the 2005 Atlantis conference on Melos. Richter offered us a number of very interesting and cogently argued points in his essay. He discusses the topographical details provided by Plato and concludes that the capital city of Atlantis was constructed on a river delta^(b). He contended that the ‘circular’ canals were possibly an adaptation of existing natural features and provides good reasons to believe that the dimensions noted by Plato are incorrect as a consequence of confusion between the Greek stade and the Egyptian ‘khet’. 

Sadly, Ulf died of cancer in April 2006.

^(a)  http://www.atlantis-schoppe.de/richter.pdf

^(b)  http://docs.google.com/gview?url=http%3A%2F%2Fblack-sea-atlantis.com%2Frichter.pdf