Constant Head Permeameter Method

1 Constant Head Permeameter Method (for Very Porous Soils) 

If a constant water head is maintained on one end of a saturated column of soil of length(L), the volume of water (Q) percolating through the other end per emit cross-sectional area (A) of 

According to Darcy s law the proportionality constant K in the above equation is the hydraulic conductivity of the soil. 

The symbol AH = Hi - Ho denotes the difference in total head between inflow and outflow ends of a column. 

Where Hs and Ifg- stand for suction head and gravitational head, respectively i and o indicate inflow and outflow ends, respectively. Upward direction is considered as positive, water drips out freely from the bottom of the soil column. Under such conditions Ho = 0, since Hso and H go both are equal to zero. 

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The mean hydraulic conductivities for the aquifer sand determined using the two laboratory methods (constant-head and falling-head permeameters) were 5 10"4 m sec"1 and 2 1 O 4 m sec"1, respectively. The isotherm results showed that the sand had negligible sorption capacity for either chromate 01 PCE. 

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