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Enc2 This article or section refers to elements from the Dune Encyclopedia.
There are separate pages for this subject as it appears in the other canons, the reasons for this are explained here
  • Dew collector as it appears in Original Dune
  • Dew collector as it appears in Expanded Dune

Dew collectors (or dew precipitators) were smooth chromoplastic ovals which were placed over the pit containing the plant's roots. During the day, the chromoplastic was gleaming white — at night, transparent. It cooled rapidly following the change, and condensed air moisture which then trickled down to the roots. Along with windtraps, the dew collectors were the most important tools for collecting atmospheric moisture on Arrakis.

They were introduced to Arrakis by Pardot Kynes, Imperial Planetologist, for use in planting experiments in the open desert. Invention of the precipitator is credited to Pajit Narayam (7520-7613); it was first used on Zecrati in 7587. It has been used on many dry, low-precipitation planets like New Bhutan, Deviil, and Salusa Secundus to support local agriculture.


Dimensions of the units varied from planet to planet depending on solar distance and atmospheric composition and density. The typical precipitator of Arrakis was half of a circular ellipsoid:

  • inner radius 1.59 cm
  • outer radius 1.75 cm
  • long axis 4 cm
  • short axis 3.17 cm.

The bowl or "saucer" sat in the ground around the stem of the plant with its concave surface facing upward.

The precipitator had a dual function: during the day it reflected sunlight from its unfocused surface and thus helped keep its plant cool. When the sun went down, the conductivity of the material cooled the precipitator more quickly than the air. Atmospheric moisture condensed on the surfaces, dribbled to the small opening at the center for the stalk of the plant, and dripped directly onto the root.

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