Runways

I have just come across http://wtp2.appspot.com/wheresthepath.htm?l.
All runways are not dead flat/level. This program gives one the ability to put a line down any runway and to produce a cross-section of the rise/fall of that runway (in UK). The Canberra (and Valiant) Pilots used to say that at Wittering (when taking-off to the west with a full load) you could get very nearly airborne just before the “dip” in the runway. Then, you hit the other side of the “dip” and, basically, “bounced” the aircraft into the air (provided the undercart would take it!!)! Whether, or not, this has any credence I know not! But, having been Pax (or Supernumary Aircrew), from a number of UK airfields this might be a reasonable vehicle to test (and/or confirm/refute) some of the extant “stories”.
HTH
Resmoroh