There were a series of experimental releases of denser-than-air gases conducted

Question

There were a series of experimental releases of denser-than-air gases conducted in the UK. 
In each trial, 2000 m3 of an ambient temperature gas was instantaneously released. 
In trial 15, the actual volume was 2100 m3, the windspeed was 5.4 m/s, D stability, and initial density over air density was 1.41 (ambient temperature was 283.5 K).
  The measured concentration at 300 m was 1.3% (gas sensors had a response time of 0.6 s). 
How well does the Britter-McQuaid prediction compare with the observed concentration?  For this puff release, the averaging time of the sensors matches the puff model averaging time.

Explanation / Answer

According to Britter-McQuaid prediction the dense plumes should also experience crosswind meandering, because they entrain atmospheric air with crosswind velocity fluctuations. Hence the predictions compares well with the bserved concentration.

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