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Constant Head Permeability Test Results

This document summarizes the results of a constant head permeability test conducted according to BS-5930 (1981) standards. The test was performed in a borehole at a depth of 6.23 feet below the top of the casing in clayey silt soils. Over a period of 50 minutes, a total flow of 11 cubic centimeters was measured, yielding a permeability rate of 5.78 x 10-7 centimeters per second.

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Ignatius Pathula
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295 views1 page

Constant Head Permeability Test Results

This document summarizes the results of a constant head permeability test conducted according to BS-5930 (1981) standards. The test was performed in a borehole at a depth of 6.23 feet below the top of the casing in clayey silt soils. Over a period of 50 minutes, a total flow of 11 cubic centimeters was measured, yielding a permeability rate of 5.78 x 10-7 centimeters per second.

Uploaded by

Ignatius Pathula
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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FIELD PERMEABILITY TEST(Vertical)

BS-5930 (1981)
Constant Head Permeability Test Site: Head Khanki Barrage Location:
Depth below top of casing: Job No. Borehole: BH - Bhabr
(a) Bottom of borehole: (1.90) 6.23 ft Date: 22-05-08 Test No: 01
(b) Bottom of casing: (1.90) 6.23 ft Groun level: Crew/Operator: Mohsin
(c) Top of filter material: - ft Weather: Cloudy Tested by: Adnan / Safdar
(d) Initial ground water level: - ft External diameter of casing: 0.2403 ft
Height of casing above surface:(1.19)m ft Length of filter: - ft
Elevation of casing: ft Type of soil: Clayey Silt

Clock Time Elasped Time Initial Reading Final Reading Flow (cm3)
2:47:00PM 1 (1) 1000 ml 1000 ml 0
2:48 1 (2) 1000 ml 1000 ml 0
2:49 1 (3) 1000 ml 1000 ml 0
2:50 1 (4) 1000 ml 1000 ml 0
2:51 1 (5) 1000 ml 1000 ml 0
2:53 2 (7) 1000 ml 1000 ml 0
2:55 2 (9) 1000 ml 998 2
2:57 2 (11) 998 998 0
2:59 2 (13) 998 998 0
3:01 2 (15) 998 998 0
3:06 5 (20) 998 992 6
3:11 5 (25) 992 992 0
3:16 5 (30) 992 991 1
3:26 10 (40) 991 990 1
3:36 10 (50) 990 989 1

Total Elapsed Time (Min) 50 (3000) Total Flow ( cm3 ) 11

q= (Total Flow) / (Elapsed Time) 0.00366 cm3/sec


F= 2.75 x 7.325 = 20.143 cm
Hc= ( Total Head in cm ) 309 cm
K= q/ F * Hc = 5.78 x 10 -7 cm/sec

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