Unsaturated- Saturated Tension-saturated- Seurated moisture Dryingy content porosity 30 n-30 20 Moisture content, 1% by voll Saturated hydraulic conductivity, Ko 0.026 cm/min 0.02 Hydraulic conductivity, K (cm/min) Wetting 400-300-200-100 100 Pressure head, (cm of water) (a) -400-300 -200 -100 Pressure head, (cm of water) (b) ° Hydraulic properties of a naturally occurring sand soil: (a) SWRC, and (b) K-function 0.01
A monitoring program for water flow in an unsaturated soil layer includes sensors to measure the volumetric water content and suction up to a depth of 3 m. The soil is a sand whose hydraulic properties are shown in the figures below. Using the drying curves, draw a quantitatively accurate set of vertical profiles of volumetric water content, pressure head, and total hydraulic head versus depth (with a datum at the base of the soil layer and an elevation head that is positive upward) expected for the following cases:
A) The volumetric water content (moisture content) is 10% throughout the profile
B) The pressure head is -150 cm throughout the profile
C) The total hydraulic head is 100 cm throughout the profile (static no-flow case)
Also, report the hydraulic gradient for each case. For parts (a) and (b), calculate the flow rates through the profile. For part (c), calculate the depth to the water table.
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