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HomeSUPPORTKnowledge BaseGroundwater SamplingDrawdown
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Drawdown

Are there any drawbacks to using flow rates of less than 100 mL per minute if they are required to limit drawdown?

Is there an upper limit for purging and sampling as long as drawdown is not affected?

If the .1-meter drawdown specification from the EPA is not really valid should any rule of thumb be used for the amount of acceptable drawdown or does the science say that you only need to pay attention to drawdown stabilization?

In a low-flow dedicated system where drawdown cannot be stabilized due to very low hydraulic conductivity what is the recommended protocol?

Do you have any suggestions for wells that reach drawdown stabilization between 10 and 50 mL per minute?

What is considered unacceptable drawdown with low-flow purging?  And, what happens if you cannot purge slow enough to meet this requirement?

What are good parameters and corresponding stabilization criteria for drawdown?

Is it the amount of drawdown that determines the mixing?

What is the maximum drawdown allowed when sampling?

I am having problems with parameters, and drawdown stabilization.

What are the standard limits of drawdown for low flow sampling?

How do you measure drawdown while you are pumping?

At what point does drawdown disrupt equilibrium and impact sample results?

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