Pumping Tests
A pumping test (or aquifer test) is conducted to evaluate an aquifer by stimulating the aquifer through constant pumping, and observing the aquifer's response (drawdown) in observation wells. Pump testing is a common tool that hydrogeologists use to characterise a system of aquifers, aquitards and flow system boundaries.
A slug test is a variation on the typical pumping test where an instantaneous change (increase or decrease) is made, and the effects are observed in the same well. This is often used in geotechnical or engineering settings to get a quick estimate (minutes instead of days) of the aquifer properties immediately around the well.
Pumping tests are typically interpreted by using an analytical model of aquifer to match the data observed in the real world.
Pumping Tests are undertaken to obtain data, with which to:
- Determine the hydraulic properties of an aquifer or aquifers.
- Determine spatial effects of pumping.
- Assess the hydraulic behavior of a well upon pumping.
- Information on water quality and its variability with time.
When applied to the design of Dewatering Systems, a pumping test gives the best information on the drawdown level, flow rates and unforeseen factors generated upon pumping.
It is unfortunate that pumping tests are not automatically carried out during site investigation where, the initial cost of a short test, far out weighs the extra costs created by unforeseen hydrogeological conditions once on site.
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Project Dewatering Ltd offer a comprehensive, cost-effective pumping test service, that involves initial desk study, followed by drilling and undertaking of the test to BS 6316 (1992). The results of the test are compiled by our consultant and presented in an easy to understand format to the client, as a full factual and interpretive report.