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Berlin Environmental Atlas

01.11 Criteria for the Evaluation of the Soil Functions (Edition 2009)

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01.11.8 Water Supply

Description

Water supply of plants depends on capacity of soil to store precipitated water in root zone and capability of sending this water again to plant root. Quantity of water which soil can hold depends on the type of soil, humus, storage thickness and share of coarse soil. Ground water in contact with soil climbs by capillary action and plays vital role in water supply of plants.
Evaluation of soil with respect to water supply depends on average utilizable capillary capacity of flate root zone.

Methodology

Water supply of locations and soil assosiations is derived from medium utalizable capillary capacity (nFk) of flate root zone (3 dm) (cf. map. 01.06.02), this criteria is only for evaluation of yield function of cultivated plants (cf. 01.12.2), and of living space function of near natural and seldom plant association (cf. 01.12.1). Water supply for deep root plants for example trees are not considered here. Evaluation is given in table 1. By increasing ground water depth to < 0,8 m evaluation of capillary capacity will become one level higher. (If its not already high).

Table 1: Level of utilizable capillary capacity and evaluation of water supply
nFK [mm] flate root zone Level nFK nFK Level Water supply
      Description Remarks
< 20 - < 60 1 - 2 very low - low 1 bad
60 - < 80 3 - 4 medium moderate - increased 2 medium
80 - > 110 5 - 6 high to very high 3 good
Tabelle 1: Level of utilizable capillary capacity and evaluation of water supply (Gerstenberg 2005)

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