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Wrc.svg en calculated diagram of soil with model formula van Genuchten cite web bgr bund de pdf Verknpfungsregel Parameter fr das Modell einer stetigen Funktion der Beziehung AdhocAG Boden PDF KiB Staatlichen Geologischen Dienste und BGR German thetaPsi mathrm theta thetar frac thetas thetar left left alpha frac left