8. Soil samples were taken at different locations from a 0.4 ha farm using the core samplers (10 cm diameter x 5 cm length) about 48 hours after a rainfall event. The following measurements were made before and after oven drying the samples: Sample No. Mass of wet sample Mass of dry sample (gm) (em) 1 651.49 549.78 2 3 644.90 541.93 530.15 632.47 613.12 647.92 510.51 545.85 4 6. 628.83 526.22 593.96 490.88 8 602.19 572.56 502.66 471.24 10 644.44 542.00 a) Calculate the average water content of the soil (% volume). b) Calculate the average depth (mm) of water present in 50 cm depth of the soil. c) Calculate the average volume of water present in the soil.
8. Soil samples were taken at different locations from a 0.4 ha farm using the core samplers (10 cm diameter x 5 cm length) about 48 hours after a rainfall event. The following measurements were made before and after oven drying the samples: Sample No. Mass of wet sample Mass of dry sample (gm) (em) 1 651.49 549.78 2 3 644.90 541.93 530.15 632.47 613.12 647.92 510.51 545.85 4 6. 628.83 526.22 593.96 490.88 8 602.19 572.56 502.66 471.24 10 644.44 542.00 a) Calculate the average water content of the soil (% volume). b) Calculate the average depth (mm) of water present in 50 cm depth of the soil. c) Calculate the average volume of water present in the soil.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![8. Soil samples were taken at different locations from a 0.4 ha farm using the core samplers (10 cm
diameter x 5 cm length) about 48 hours after a rainfall event. The following measurements were made
before and after oven drying the samples:
Sample No.
Mass of wet sample
Mass of dry sample
(gm)
651.49
(gm)
549.78
1
2.
644.90
541.93
3
632.47
530.15
4.
613.12
510.51
647.92
545.85
628.83
593.96
526.22
7.
490.88
8
602.19
502.66
572.56
471.24
542.00
10
644.44
a) Calculate the average water content of the soil (% volume).
b) Calculate the average depth (mm) of water present in 50 cm depth of the soil.
c) Calculate the average volume of water present in the soil.
d) Assuming the soil water conditions at the time of sampling represent the field capacity water content
of the soil and assuming further that the average permanent wilting point water content of the soil on the
farm is 8.73 % by mass, compute the average water content of the soil at irrigation for an allowable soil
water depletion factor and average rooting depth of 0.55 and 1.2 m respectively.
e) Calculate the average net irrigation requirement (mm) on the farm.
f) Calculate the gross amount of irrigation required (mm) if irrigation is applied at 70 % efficiency.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fef2c8a11-613c-49e9-9a48-e292ba755ae9%2F5eab583e-a955-4faf-81d1-f4f3c7ee0ec7%2F51o0u9t_processed.png&w=3840&q=75)
Transcribed Image Text:8. Soil samples were taken at different locations from a 0.4 ha farm using the core samplers (10 cm
diameter x 5 cm length) about 48 hours after a rainfall event. The following measurements were made
before and after oven drying the samples:
Sample No.
Mass of wet sample
Mass of dry sample
(gm)
651.49
(gm)
549.78
1
2.
644.90
541.93
3
632.47
530.15
4.
613.12
510.51
647.92
545.85
628.83
593.96
526.22
7.
490.88
8
602.19
502.66
572.56
471.24
542.00
10
644.44
a) Calculate the average water content of the soil (% volume).
b) Calculate the average depth (mm) of water present in 50 cm depth of the soil.
c) Calculate the average volume of water present in the soil.
d) Assuming the soil water conditions at the time of sampling represent the field capacity water content
of the soil and assuming further that the average permanent wilting point water content of the soil on the
farm is 8.73 % by mass, compute the average water content of the soil at irrigation for an allowable soil
water depletion factor and average rooting depth of 0.55 and 1.2 m respectively.
e) Calculate the average net irrigation requirement (mm) on the farm.
f) Calculate the gross amount of irrigation required (mm) if irrigation is applied at 70 % efficiency.
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