University of Hertfordshire

From the same journal

By the same authors

  • Bruce D.L. Fitt
  • P.J. Walklate
  • H. A. McCartney
  • A. Bainbridge
  • N.F. Creighton
  • J.M. Hirst
  • M.E. Lacey
  • B.J. Legg
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Original languageEnglish
Pages (from-to)661-671
Number of pages11
JournalAnnals of Applied Biology
Publication statusPublished - Dec 1986


The rain tower/wind tunnel complex at Rothamsted consists of a rain tower (height 11 m, cross-section 1 m2) linked to the upwind end of a wind tunnel (length 12 m, cross-section 1 m2), which may be operated in either an open or a closed configuration. At the top of the rain tower, water drops with diameters of 2.5 to 5 mm are produced by a drop generator, which can be fitted with different nozzles. Simulated rain with a drop diameter of 1 to 3 mm is produced at a rate of 8 to 12 mm h-1 by a rain generator with an area of 52 × 67 cm. The rain tower may be operated in conjunction with the wind tunnel in an open configuration. The windspeed can be decreased from a maximum of 8 m s-1 by decreasing the speed of the fan. The wind tunnel has its own internal lighting. When the wind tunnel is in a closed configuration, temperature and humidity can be controlled in the range 12 oC (62–80% r.h.) to 35 oC (22–50% r.h.). Data presented illustrate the use of this rain tower/wind tunnel complex to study dispersal of plant pathogen spores by rain-splash or wind.

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