Transcription of Lecture 7: Soils and Infiltration
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Lecture 7: Soils and Infiltration
Lecture 7: Soils and InfiltrationKey is a soil? are soil types classified? is Infiltration ? quantities control Infiltration rate? is soil is soil is capillarity?rain drop infiltrating into soilSoil type and thickness affect runoff and streamflowSoilis an unconsolidated aggregate of mineral and rock fragments ranging in size from clay, silt, sand, to gravel. Some Soils (near surface) also contain organic matter. Soil type (or classification) is determined by fragment (clast) size and distribution of clast SIZESSoil classification can get more descriptive, but for hydrology purposes we use clast Soil Texture Classificationrelative sizeFigure 1. Location of Whatcom County In Survey ofWhatcom County Area, WashingtonBy Alan Goldin, , Soil Conservation Service Washington State Department of Natural Resources United States Department of Agriculture, Soil Conservation ServiceDigital soil data (for ArcGIS) is available from the following data Coverage (USDA)Infiltrationis the movement of water INTO the soil surfaceinfiltrationpercolationPercolatio nis the movement of water WITHIN the soil matrix.
The degree of infiltration and runoff depends on the soil type. Rainfall characteristics . determine the amount of infiltration versus runoff. light rain – more infiltration ... air and are the same forces that bind sand together in the sculpture below . Open the link below and read about water properties and capillarity. Soils with smaller ...
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