2. Use the Green-Ampt method to evaluate the infiltration rate and cumulative infiltration depth for clay loam at 1-hr up to 5-hr (1-hr increment) from the beginning of infiltration. The effective saturation is 30% (A), 45% (B), 60% (C). Compare and make conclusion for the results of A, B and C. Time Infiltration rate Infiltration depth cm hr cm/hr 1 2 3 4 5

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Chapter2: Loads On Structures
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2. Use the Green-Ampt method to evaluate the infiltration
rate and cumulative infiltration depth for clay loam at 1-hr
up to 5-hr (1-hr increment) from the beginning of
infiltration. The effective saturation is 30% (A), 45% (B),
60% (C). Compare and make conclusion for the results
of A, B and C.
Time
Infiltration rate
Infiltration depth cm
hr
cm/hr
1
2
3
4
5
Transcribed Image Text:2. Use the Green-Ampt method to evaluate the infiltration rate and cumulative infiltration depth for clay loam at 1-hr up to 5-hr (1-hr increment) from the beginning of infiltration. The effective saturation is 30% (A), 45% (B), 60% (C). Compare and make conclusion for the results of A, B and C. Time Infiltration rate Infiltration depth cm hr cm/hr 1 2 3 4 5
Soil class
Sand
Loamy sand
Sandy loam
Loam
Table 7.4.1 Green-Ampt Infiltration Parameters for Various Soil Classes*
Wetting front
soil suction
head y (cm)
4.95
(0.97-25.36)
Porosity
n
Silt loam
Sandy clay loam
Clay loam
Silty clay loam
Sandy clay
Silty clay
Clay
0.437
(0.374-0.500)
0.437
(0.363-0.506)
0.453
(0.351-0.555)
0.463
Effective
porosity
0₂
0.417
(0.354-0.480)
0.401
(0.329-0.473)
0.412
(0.283-0.541)
0.434
(0.334-0.534)
0.486
(0.394-0.578)
0.330
6.13
(0.235-0.425)
0.309
(0.279-0.501)
0.432
(0347-0.517)
0.321
(0.207-0.435)
0.423
(1.35-27.94)
11.01
(2.67-45.47)
8.89
Hydraulic
conductivity
K (cm/h)
11.78
2.99
(0.375-0.551)
(1.33-59.38)
0.501
16.68
(0.420-0.582)
(2.92-95.39)
0.398
21.85
(0.332-0.464)
(4.42-108.0)
0.464
20.88
(0.409-0.519)
(4.79-91.10)
0.471
27.30
(0.418-0.524)
(5.67-131.50)
0.430
23.90
(0.370-0.490)
(4.08-140.2)
29.22
0.479
(0.425-0.533)
(0.334-0.512)
(6.13-139.4)
0.475
0.385
31.63
(0.427-0.523)
(0.269-0.501)
(6.39-156.5)
* The numbers in parentheses below each parameter are one standard deviation around the parameter value given.
1.09
0.34
0.65
0.15
0.10
0.10
0.06
0.05
0.03
Transcribed Image Text:Soil class Sand Loamy sand Sandy loam Loam Table 7.4.1 Green-Ampt Infiltration Parameters for Various Soil Classes* Wetting front soil suction head y (cm) 4.95 (0.97-25.36) Porosity n Silt loam Sandy clay loam Clay loam Silty clay loam Sandy clay Silty clay Clay 0.437 (0.374-0.500) 0.437 (0.363-0.506) 0.453 (0.351-0.555) 0.463 Effective porosity 0₂ 0.417 (0.354-0.480) 0.401 (0.329-0.473) 0.412 (0.283-0.541) 0.434 (0.334-0.534) 0.486 (0.394-0.578) 0.330 6.13 (0.235-0.425) 0.309 (0.279-0.501) 0.432 (0347-0.517) 0.321 (0.207-0.435) 0.423 (1.35-27.94) 11.01 (2.67-45.47) 8.89 Hydraulic conductivity K (cm/h) 11.78 2.99 (0.375-0.551) (1.33-59.38) 0.501 16.68 (0.420-0.582) (2.92-95.39) 0.398 21.85 (0.332-0.464) (4.42-108.0) 0.464 20.88 (0.409-0.519) (4.79-91.10) 0.471 27.30 (0.418-0.524) (5.67-131.50) 0.430 23.90 (0.370-0.490) (4.08-140.2) 29.22 0.479 (0.425-0.533) (0.334-0.512) (6.13-139.4) 0.475 0.385 31.63 (0.427-0.523) (0.269-0.501) (6.39-156.5) * The numbers in parentheses below each parameter are one standard deviation around the parameter value given. 1.09 0.34 0.65 0.15 0.10 0.10 0.06 0.05 0.03
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