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Determining Hydraulic Conductivity Essay

611 words - 2 pages

The first three points of the graph are located lower because some air was trapped in the core sample. The hydraulic conductivity becomes almost constant after approximately twenty minutes. The average hydraulic conductivity doesn’t have to be converted to the standard temperature because we worked under the standard temperature. The average hydraulic conductivity is 2,8 ∙ 10-5. According to the classes of saturated hydraulic conductivity, modified after Kutilek and Nielsen (1994) it is typically a loamy sand.

The soil classified according to the permeability classes proposed by O’Neal (1949) indicates that the class is moderately rapid. The water will flow rapidly through the soil, so when irrigation or drainage applied to this soil, it will probably drain quickly but to know sure the infiltration rate has to be calculated which is dependent on the hydraulic head difference.

There are two important properties that determine the hydraulic conductivity: the geometry of the pore system and the intrinsic properties.

The geometry of the soil exists out of the texture and the structure of the soil. Soil compaction during core extraction, wall leakage in loose samples, presence of any hole made by animal or plant, precipitation forming surface crusts, shrinking and swelling and agriculture activities are responsible for small variations of the hydraulic conductivity of the same soil.

The intrinsic properties are especially the viscosity and the bulk density.

The average hydraulic conductivity is 2,8 ∙ 10-5. This soil is loamy sand and has a moderately rapid permeability.

3 Determination of vertical infiltration: infiltration rate and cumulative infiltration
3.1 Introduction

The study of infiltration, i.e. the process of water entry into the soil, is of importance, not only as it affects the water economy of plants communities which is important in e.g. irrigation studies, but also as it determines the amount of surface runoff and its attendant...

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