This page provides a lot of valuable insights for conducting water landings. However, it is served over an insecure connection, displays advertisements, has a pretty illegible font-size, and uses some ugly styles. While I generally advocate sending people to the original source, I'd consider this an exception and would recommend integrating their text or at least the information from it into E.L.S.A.
The content should be linked to from the Risk factors page of the guide. It should reference the original source.
http://www.pilotfriend.com/safe/safety/ditching.htm