# sw5 - Energy and Water Flow Determination Gravitational and...

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Energy and Water Flow Determination

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Gravitational and Matric Potential Energies
Gravitational Potential Ψ g = mgh The greater the height, the greater the potential energy. The potential energy of a unit quantity of water. Unit quantities: volume mass weight ψ g = mg Ψ g = h (cm) mg

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Gravitational Potential Reference level Ψ g = 0 Height (cm) 100 50 a b ψ ga = 100 cm ψ gb = 40 cm 40 soil Difference in energy determines movement Independent of soil properties Ψ ga – Ψ gb 100 - 40 = 60 cm
Gravitational Potential Reference level g = 0) Height (cm) 100 a b Ψ ga = 60 cm Ψ gb = 0 cm Ψ ga – Ψ gb 60 - 0 = 60 cm 40 0

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Gravitational Potential 1. Gravitational potential energy is due only to the height of an object (water) above some reference point . 2. Gravitational potential energy is independent of soil properties.
Capillary Potential Energy (Matric Potential Energy)

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Matric Potential “suction” potential - capillarity Applies to unsaturated soils Relates to the ability of soils to move water into their pores
Primary Factors in Matric Potential Texture, Density, Structure Pore Size Distribution Moisture Content Which Pores are Filled

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## This note was uploaded on 02/04/2011 for the course SWS 3022 taught by Professor Bonczek during the Spring '11 term at University of Florida.

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sw5 - Energy and Water Flow Determination Gravitational and...

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