Objective:

To determine the hydraulic conductivity how easily water can pass through the rock or the soil.

Apparatus used:

Trowel, Test Cylinder, Coarse Sand, Filter Paper

STEP  1 

 Calculation of the cross sectional area of the cylinder: Take the caliper and measure the diameter of the cylinder. From this cross sectional area is getting as section is cylinder.

Diameter=13.79cm²

Area=^d2π⁄₄= cm²/s

CHECK RESULT CHECK RESULT Please Enter Value to proceed

Prepare the Soil Sample

STEP  2 

 Take one killogram of coarse soil sample and place it in conatiner and measure the sample.

Mass of the container and initial volume of the soil (g>) = _________

STEP  3 

 Put the screen at the bottom of the test cylinder and place the soil sample. Soil sample should be arranged in layers and each layer is levelled by using hammer.

Note:- Fill the cylinder until it is full

STEP  4 

 The top of the column should level so that small gaps are filled properly and covered with screen and a separator. Top should be covered with the cap and three screws.

Note:- Tighten the rest of the screws.

STEP  5 

  After that weigh the remaining soil sample.

Mass of the container and remaining soil = _________

STEP  6 

 Connect the intake line of the reservoir to the top of the test cylinder and other two lines to the other two nominals of the test cylinder. This is to measure the pore water pressure of the water at specific points.

STEP  7 

Close the valve of the intake line and turn the tap so that intake line will fill up and extra water will come from the discharge tube so that water level is constant in the reservoir 

Note:- Turn on the tap.

Constant Head Test Permeability

STEP  8 

Now open the valve so that water flow to the sample. For measure the flow rate water should run to the system for few minutes. 

Note:- Record the pore water pressure.

STEP  9 

 For the water flow rate measurement take a water beaker and measure its weight. And record the values in the table.

Mass of the empty container = _________

STEP  10 

 Use and the stopwatch allow the discharge tube to the beaker. Collect the 300 ml of the water and stop the watch and remove the discharge tube.

Trial : 1

Note:- Record the time taken and measure the mass of beaker with water.

STEP  11 

Measure the mass of container and water. 

Mass of the beaker and water = _________

STEP  12 

Add the measured values to the table. 

Test Number	1
Time to accumulate water	8 sec
Mass of beaker +water	419.4
Mass of water	304.9

STEP  10 

 Use and the stopwatch allow the discharge tube to the beaker. Collect the 300 ml of the water and stop the watch and remove the discharge tube.

Trial : 2

Note:- Record the time taken and measure the mass of beaker with water.

STEP  11 

Measure the mass of container and water. 

Mass of the beaker and water = _________

STEP  12 

Add the measured values to the table. 

Test Number	1	2
Time to accumulate water	8 sec	13 sec
Mass of beaker +water	419.4	621.6
Mass of water	304.9	507.1

STEP  10 

 Use and the stopwatch allow the discharge tube to the beaker. Collect the 300 ml of the water and stop the watch and remove the discharge tube.

Trial : 3

Note:- Record the time taken and measure the mass of beaker with water.

STEP  11 

Measure the mass of container and water. 

Mass of the beaker and water = _________

STEP  12 

Add the measured values to the table. 

Test Number	1	2	3
Time to accumulate water	8 sec	13 sec	19 sec
Mass of beaker +water	419.4	621.6	811.5
Mass of water	304.9	507.1	697

STEP  13 

Calculate the head applied to the sample. Measure the total head at the top monometer and total head at the bottom monometer. 

STEP  14 

Observation & Calculation. 

Variables used in calculation Mass of container and initial volume of soil=1256.5g
Mass of container and remaining soil=578.6g
Mass of soil in the column=675.6g
Mass of empty beaker=49.8g
Total head at the top monometer=49.8cm
Total head at the top monometer=11.3cm
Vertical distance between monometer outlets=114.5cm
Formula K=^QL⁄_tAh
Q=Volume of water collected in(ml)
L=Sample Height(cm)
t=Duration of water collection in(sec)
A=Cross Sectional Area of soil Specimen(cm²)
h=Total Constant Head(cm)
CHECK RESULTPlease Enter Value to proceed

Test Number	1	2	3
Time to accumulate water	8sec	13sec	19sec
Mass of beaker+water	419.4	621.6	811.5
Mass of water	304.9	507.1	697
Coefficient of Permeability

Coefficient of Permeability (K_avg) = Please Enter Value to proceed