# Calculate Conductivity (k) from Packer Test result. Calculate Conductivity (k) from Packer Test result.

[ReviewAZON asin=”1406733539″ display=”inlinepost”]First determine what zone is represented by the Packer intervals:

• Zone 1: Unsaturated zone above the water table.
• Zone 2: Intermediate zone with both unsaturated and saturated zone.
• Zone 3: Zone below the water table

Determine head loss from published graphs – required when flow is >2 gallons/min

Zone 3 (Saturated, below water table)-Straddle packer

K=Q/(Cs*r*H)
• K=conductivity
• 2.Q=Average flow recorded during test (unit: gpm or ft/s)
• 3.Cs=Conductivity coefficient for saturated material (depends on length of test interval
• and diameter of borehole; get it from published graph.
• 1.r=radios of borehole (unit: feet)
• 2.H=Effective Head=h1+h2-L
• 3.h1=depth to water table from pressure gage
• 4.h2=amount of pressure applied for the test zone (recorded during packer test)
• 5.L=friction loss; calculate if flow is >2gpm from published graphs.

Find Cs from Published graph:

Calculate L (Friction loss from published graphs/tables)

You may need: Hydraulic Field Manual for the table of head loss based on Darcy’s Law:

Buy Here: [ReviewAZON asin=”0071348328″ display=”inlinepost”]

 A = Length of Test Interval r = Radius of Borehole C s = Conductivity Coefficient (from published graph) h 1 = Distance from Gage to Water Table h 2 = Applied Pressure at Gage L = Friction Loss of pipe H = Effective Head (h 1 + h 2 – L) Q = Steady Flow Rate of Injection K = Hydraulic Conductivity