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:
Cs
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 | ||
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