CSEM 240 Lecture Notes - Lecture 14: Surface Runoff, Humus, Frost Heaving
31 Dec 2016
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When a tube with a small diameter is placed in water, the water will rise in the tube. The smaller the diameter of the tube, the higher the water will rise: at 20degreesc, h=0. 15/r, h height of water rise (cm, r tube radius (cm) Capillary rise also occurs in soils, and the rise is higher in finer textured soils. Water in the soil moves from a high energy state to a lower energy state. T = g + m + o. H height of the soil water above a reference elevation. Usually chosen at the lower boundary of the soil profile so that g will be positive. If the point is below the reference elevation g will be negative. M is always negative because the water attracted by the soil matrix has an energy. In general, o has little effect on the movement of water in soils and we will not.
