CHM 1311 Lecture Notes - Lecture 4: Ministry Of Intelligence, Precondition
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The following questions are related to measuring saturated flow in a given soil. Use the formula for saturated soil discharge and the table below to answer the questions. Be sure and show your work.
Calculate Ksat (cm/sec) using the following measurements (5pts):
A = 113in2, t = 15 sec, Q = 150ml, Îh = 66cm, L = 125cm
Using the information from the table below and your calculated Ksat, what is the likely soil texture? (5pts)
K (cm/s) | 102 | 101 | 1 | 10-1 | 10-2 | 10-3 | 10-4 | 10-5 | 10-6 | 10-7 | 10-8 | 10-9 | 10-7 |
Relative permeability | Pervious | Semi-Pervious | Impervious | ||||||||||
Aquifer | Good | Poor | None | ||||||||||
Unconsolidated Sand and Gravel | Well sorted gravel | Well sorted sand or sand & gravel | Very fine sand, silt, loess, loam | ||||||||||
Unconsolidated Clay and Organic | Peat | Layered clay | Fat/Unweathered clay |
You were assigned by the local soil conservation district to take some field measurements to help assess the soil water conditions of a given area for potential agricultural usage. The diagram below schematically shows the distribution and depth of tensiometers and lysimeters (used to determine soil moisture content). Data from each tensiometers and lysimeters group is taken from the bottom ( ). Use the table of field data to answer the following questions.
ΨTot (kPa) | Soil Wetness (cm3/cm3) | Air Porosity (%) | Soil Water Condition | |
Group A | -20 | 0.28 | 15 | |
Group B | -50 | 0.18 | 32 | |
Group C | -35 | 0.22 | 24 | |
Group D | -25 | 0.25 | 22 | |
Group E | -45 | 0.15 | 35 | |
Group F | -30 | 0.12 | 28 |
In the space provided in the above data table, label the likely soil water conditions as related to maximum retentive capacity, field capacity, wilting coefficient, and hygroscopic coefficient. (12 pts)