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Catchment Descriptors Soil (2)

Catchment Descriptors Soil (2). SOILHCMEAN - Mean hydraulic conductivity of the soils [cm/d] SOILLHC - Percentage of soils with low hydraulic conductivity [%]

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Catchment Descriptors Soil (2)

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  1. Catchment Descriptors Soil (2) • SOILHCMEAN - Mean hydraulic conductivity • of the soils [cm/d] • SOILLHC - Percentage of soils with low • hydraulic conductivity [%] • Hydraulic conductivity is a “property of a saturated porous medium which determines the relationship, called Darcy’s law, between the specific discharge and the hydraulic gradient causing it” (IHP/OHP 1998). • From a 1 : 200 000 scale map with 9 classes, areal means were deduced. The lowest two classes (with a mean hydraulic conductivity of less than 2.3*10-6 m/s) were combined for the calculation of the percentage of soils with low hydraulic conductivity. • ROOTSMEAN - Mean water-holding capacity • in the effective root zone [mm] • ROOTSHIGH - Percentage of soils with high • water-holding capacity in the • effective root zone [%]    The data for this descriptor is based on a map produced by the Regional Authority for Geology, Commodities, and Mining of Baden-Württemberg (LGRB), which shows the distribution of water-holding capacity for a theoretical soil depth of 100 cm. Water-holding capacity is defined as “water in the soil available to plants. It is normally taken as the water in the soil between wilting point and field capacity. In this context water-holding capacity is used and is identical to the available water” (IHP/OHP 1998). Based on the information of soil type, land use, root depth, and water logging conditions the water-holding capacity values were adjusted to the estimated effective root zone. These values were then used to compute the areal mean. A threshold mean water-holding capacity was set at 200 mm. Above this threshold, all classes were aggregated to “soils with high water-storage capacity in the effective root zone” and its proportion was calculated.

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