In South Africa, the main aim of pumping tests is to estimate what we call sustainable yield of a borehole. The sustainable yield is defined as the rate at which the borehole can be operated for a long time (e.g. two years) without reaching a specified drawdown level (in other words, the position of the main water strike in a fractured-rock aquifer), including the influence of boundaries and other boreholes.
Step 2: Select Your Site
Last year, one of my associates asked me to develop a single field test procedure that could be used company-wide for water-pumping applications. After a little research, I found that we were using several different procedures, and although similar, the measured results could differ depending upon the system conditions. I put together several versions and received feedback from our field personnel. I also received some excellent feedback from Lee Ruiz, one of our faithful Pumps & Systems readers and commentators.
Transforming Data From Data Loggers (Slug Test)
During the pumping test, changes in the barometric pressure can have an affect on the recorded drawdown data, and should be considered during the data analysis. AquiferTest includes the tools to correct drawdown data for barometric effects, using data pre-processor tools. Barometric pre-processing generally involves the following steps:
Step 2: Select Your Site
You need to transform your data into readings of elapsed time since the start of the test and displacement. You can use AQTESOLV to make the necessary transformations that shift the time and water-level data. To perform adjustments, you will need the following two bits of information:
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Two motor-driven centrifugal pumps, mounted on a stainless steel plinth with a water reservoir and pipework for continuous circulation. The pumps can be configured for single pump operation, two pumps in parallel or two pumps in series by using manually operated ball valves. Similarly, manual valves are used to control the flow and facilitate the study of suction effects, including demonstration of air release.
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The performance curves generated by many pump manufacturers are based on results obtained in their test facilities under tightly controlled conditions. The testing techniques used in the field can vary substantially and may or may not provide accurate results.
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