AGR 2320 Lecture 19: Tuesday Oct 31 AGR2320
2 Nov 2017
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Document Summary
Water is polar- allows it to attract to surfaces along with itself. Matric potential does not exist below the water table, always negative. Hydraulics potential- addition of all of the potentials (excludes osmotic component) 1 bar= 10. 2 m water =1020 cm of water= 100kpa. Water well, you can get an idea of what the water depth is. When talking about gravity you need to set a reference point. Determine rate of soil surface, at the water table, and 15. 2 m below the surface. How much gravity is release/added in a to get it to the reference point: positive, 10. 2 m you can release 10. 2 m of energy to get us back to the reference point. Pull the water from the water table to the surface you have -10. 2m, sitting above the water table pressure is at zero, being held up by the matric. Little pores will pull all the water out of the big pores.
