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Spring 2008
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Simplify Your Pump Test with a Levelogger Gold
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Before the advent of pressure transducers with data loggers, field technicians and drilling contractors were relegated to hours, or even days on site during conventional pumping tests, continuously monitoring water level fluctuations in a vast array of observation wells. Often requiring running from well to well, readings were taken by hand with Water Level Meters. This was time consuming and Subject to human error.
Now, with instrumentation such as the Levelogger Gold, data collection is automated, and data analysis simplified. The Levelogger Gold can be programmed with a customized sampling schedule that sets the rates at which water level data is collected for a number of separate intervals. That is to say, you can customize different sampling rates and durations to record water level readings before, during and after the pumping test (baseline, pumping and recovery), as shown in the example above.
Using a similarly programmed Barologger to record atmospheric pressure fluctuations during pumping tests provides the easiest and most accurate way to compensate Levelogger data. A compensation wizard in the Levelogger Software is used to adjust your data. Compensated data can be viewed directly or exported for use in other programs.
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More Pump Test Pointers
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When using a Levelogger Gold or Levelogger Junior to perform a pumping test, there are a few important things you should consider:
- Select a Levelogger with the appropriate pressure range
- Deploy to a depth beyond maximum expected drawdown
- It must be submerged for the entire pumping test
- Deploy Levelogger above pump to minimize interference from pump motors and turbulence
- In adjacent observation wells, suspension wire deployment is adequate
- Reduces costs
- If using a Direct Read Cable the Levelogger can be started at any time
- Can view and store real-time data with a laptop
- If using a suspension wire, Leveloggers may be started before deployment, or set using the ‘future start’ option
- Use standard Water Level Meters (Model 101) for initial and final water level measurements
- Record date and time
- Used to adjust data to depth to water or elevation
measurements using the 'Manual Data Adjustment' option
of the Levelogger Software
- Be sure to record recovery data once steady state is reached and pumping is stopped
- Considered to be most valuable for determining aquifer
transmissivity.
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