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Identify the soil texture (use the soil texture triangle) and provide its porosity, saturated hydraulic conductivity, and saturated matric head based on Tables 7.1 and 7.2. Based on those parameters calculate the field capacity and wilting point for the soil*.

Identify the soil texture (use the soil texture triangle) and provide its porosity, saturated hydraulic conductivity, and saturated matric head based on Tables 7.1 and 7.2. Based on those parameters calculate the field capacity and wilting point for the soil*.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A soil sample is analyzed via a sieve analysis and determined to have the following size distribution: 10% sand and 45% silt.

  1. a)  Identify the soil texture (use the soil texture triangle) and provide its porosity, saturated hydraulic conductivity, and saturated matric head based on Tables 7.1 and 7.2. Based on those parameters calculate the field capacity and wilting point for the soil*.

  2. b)  Make a plot of the matric head vs. volumetric soil moisture and of the hydraulic conductivity vs. volumetric soil moisture for this soil.

**Table 7.2: Average Brooks-Corey Parameters as a Function of Soil Type (Clapp & Hornberger, 1978)** This table presents average Brooks-Corey parameters for different soil types. The parameters include Saturated Hydraulic Conductivity, Saturated Matric Head, and the Brooks-Corey Parameter. Values shown in parentheses indicate the standard deviation. | Soil Type | Sat. Hydraulic Conductivity [cm/hr] | Sat. Matric Head [cm] | Brooks-Corey Parameter | |--------------------|-------------------------------------|-----------------------|-------------------------| | Sand | 63.36 | -12.1 (14.3) | 4.05 (1.78) | | Loamy sand | 56.16 | -9.0 (12.4) | 4.38 (1.47) | | Sandy Loam | 12.49 | -21.8 (31.0) | 4.90 (1.75) | | Silt Loam | 2.59 | -78.6 (51.2) | 5.30 (1.96) | | Loam | 2.50 | -47.8 (51.2) | 5.39 (1.87) | | Sandy clay loam | 2.27 | -29.9 (37.8) | 7.12 (2.43) | | Silty clay loam | 0.61 | -35.6 (37.8) | 7.75 (2.77) | | Clay loam | 0.88 | -63.0 (51.0) | 8.52 (3.44) | | Sandy clay | 0.78 | -15.3 (17.3) | 10.4 (1.64) | | Silty clay | 0.37 | -49.0 (62.1) | 10.4 (4.45) | | Clay | 0.46 | -40.5 (39.7) | 11.4 (3.7) | **Explanation:** - The table provides important hydraulic parameters for
Transcribed Image Text:**Table 7.2: Average Brooks-Corey Parameters as a Function of Soil Type (Clapp & Hornberger, 1978)** This table presents average Brooks-Corey parameters for different soil types. The parameters include Saturated Hydraulic Conductivity, Saturated Matric Head, and the Brooks-Corey Parameter. Values shown in parentheses indicate the standard deviation. | Soil Type | Sat. Hydraulic Conductivity [cm/hr] | Sat. Matric Head [cm] | Brooks-Corey Parameter | |--------------------|-------------------------------------|-----------------------|-------------------------| | Sand | 63.36 | -12.1 (14.3) | 4.05 (1.78) | | Loamy sand | 56.16 | -9.0 (12.4) | 4.38 (1.47) | | Sandy Loam | 12.49 | -21.8 (31.0) | 4.90 (1.75) | | Silt Loam | 2.59 | -78.6 (51.2) | 5.30 (1.96) | | Loam | 2.50 | -47.8 (51.2) | 5.39 (1.87) | | Sandy clay loam | 2.27 | -29.9 (37.8) | 7.12 (2.43) | | Silty clay loam | 0.61 | -35.6 (37.8) | 7.75 (2.77) | | Clay loam | 0.88 | -63.0 (51.0) | 8.52 (3.44) | | Sandy clay | 0.78 | -15.3 (17.3) | 10.4 (1.64) | | Silty clay | 0.37 | -49.0 (62.1) | 10.4 (4.45) | | Clay | 0.46 | -40.5 (39.7) | 11.4 (3.7) | **Explanation:** - The table provides important hydraulic parameters for
**Table 7.1: Average Porosity as a Function of Soil Type (Clapp & Hornberger, 1978)** This table displays the average porosity values for various soil types along with their standard deviations, which are shown in parentheses. Porosity indicates the fraction of the soil volume that is occupied by voids or spaces and is an important factor in soil science, affecting water retention, root growth, and soil stability. | **Soil Type** | **Porosity** | |-----------------------|---------------| | Sand | 0.395 (0.056) | | Loamy sand | 0.410 (0.068) | | Sandy Loam | 0.435 (0.086) | | Silt Loam | 0.485 (0.059) | | Loam | 0.451 (0.078) | | Sandy clay loam | 0.420 (0.059) | | Silty clay loam | 0.477 (0.057) | | Clay loam | 0.476 (0.053) | | Sandy clay | 0.426 (0.057) | | Silty clay | 0.492 (0.064) | | Clay | 0.482 (0.050) | **Explanation:** - **Porosity Range**: The porosity values range from 0.395 for Sand to 0.492 for Silty clay, indicating varying capacities for water and air storage in different soil types. - **Standard Deviation**: The values in parentheses represent the standard deviation, highlighting the variability of porosity within each soil type. For example, Sandy Loam has a relatively high standard deviation of 0.086, whereas Clay has a lower standard deviation of 0.050, suggesting consistency in its porosity measurements. Understanding these values is crucial for applications in agriculture, hydrology, and environmental management, where soil behavior can significantly impact ecosystem health and resource management.
Transcribed Image Text:**Table 7.1: Average Porosity as a Function of Soil Type (Clapp & Hornberger, 1978)** This table displays the average porosity values for various soil types along with their standard deviations, which are shown in parentheses. Porosity indicates the fraction of the soil volume that is occupied by voids or spaces and is an important factor in soil science, affecting water retention, root growth, and soil stability. | **Soil Type** | **Porosity** | |-----------------------|---------------| | Sand | 0.395 (0.056) | | Loamy sand | 0.410 (0.068) | | Sandy Loam | 0.435 (0.086) | | Silt Loam | 0.485 (0.059) | | Loam | 0.451 (0.078) | | Sandy clay loam | 0.420 (0.059) | | Silty clay loam | 0.477 (0.057) | | Clay loam | 0.476 (0.053) | | Sandy clay | 0.426 (0.057) | | Silty clay | 0.492 (0.064) | | Clay | 0.482 (0.050) | **Explanation:** - **Porosity Range**: The porosity values range from 0.395 for Sand to 0.492 for Silty clay, indicating varying capacities for water and air storage in different soil types. - **Standard Deviation**: The values in parentheses represent the standard deviation, highlighting the variability of porosity within each soil type. For example, Sandy Loam has a relatively high standard deviation of 0.086, whereas Clay has a lower standard deviation of 0.050, suggesting consistency in its porosity measurements. Understanding these values is crucial for applications in agriculture, hydrology, and environmental management, where soil behavior can significantly impact ecosystem health and resource management.
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