WaterWare
Reference &  User Manual 
    WaterWare   On-line Manuals
      Release Level 6.2 Release Date 2010 05 Revision Level 1.0
Last modified on:   Monday, 20-Jul-09 14:05 CEST
Soil classification

There are numerous schemes for soil classification, including FAO (28 main groups), the US NRCS (11 groups), or the Canadian system (9 groups).

For WaterWare, a simple and easy to apply scheme combining texture and organic content is used.
The five texture classes:

  1. very fine
  2. fine
  3. medium fine
  4. medium
  5. coarse
are combined with 3 levels or organic content:
  1. low
  2. medium
  3. high
to result in a table of 15 soil types used to associate field capacity with, where field capcity decreases with coarseness and increases with organic content.

Field capacity:
in mm water / m soil, and by organic content,
compared with the simplified 3 level FAO classification
    LIGHT (100); MEDIUM (140); HEAVY (180)
for use in CROPWAT specifies:
organic content very fine fine medium fine medium coarse
high 200 180 160 140 110
medium 180 160 140 110 100
low 160 140 110 100 80

 


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