標準號：ISO 11275-2004
中文標準名稱：土質.不飽和液體滲導性和水保持特性的測定.風蒸發法
英文標準名稱：Soil quality - Determination of unsaturated hydraulic conductivity and water-retention characteristic - Wind's evaporation method
標準類型：Z18
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：Z18
國際標準分類號：13.080.40
適用范圍：This International Standard specifies a laboratory method for the simultaneous determination in soils of the unsaturated hydraulic conductivity and of the soil water-retention characteristic. It is applicable only to measurement of the drying or desorption curve. Application of the method is restricted to soil samples which are, as far as possible, homogeneous. The method is not applicable to soils which shrink in the range of matric head hm = 0 cm to hm = -800 cm. The range of the determination of the conductivity depends on the soil type. It lies between matric heads of approximately hm = -50 cm and hm = -700 cm. The range of the determination of the water-retention characteristic lies between matric heads of approximately hm = 0 cm and hm = -800 cm. NOTE 1 An infiltrometer method can be used to determine hydraulic conductivities near saturation. NOTE 2 ISO 11274 gives methods to determine the water-retention characteristic for matric heads between 0 cm and -15 000 cm.