Question

A well was drilled and based on the driller's log, you constructed the vertical profile shown in the figure below. Water was first encountered at 12 m; ultimately, the well was screened between 17 and 27 meters. Your boss now wants you to design a pump test. Please state briefly your approaches: e.g, what kind of data you need collect during the pump test? What kinds of aquifer properties you may estimate ed on your pump test? How to estimate these properties based on this aquifer. If your boss wants to have a drawdown of 1 meter over the first 6 hours of the test in an observation well located 150 m from the pumping well, at what rate would you pump (this would give you some information on what type of pump you need acquire)? Land surface 0.0 m Coarse sand 15.0 m 17.0 m Fine silt Loarse sand 27.0 m Bedrock

Answer 1

27 n 150m

The following reconnaissance work and planning should factor into the design of a pumping test: best time of year for geology of pertinent aquifer natural agents of pumping test and aquitard units groundwater fluctuation such as barometric pressure changes, earth tides and tidal variations which may affect water levels in observation wells during the pumping test off-site groundwater users which may influence water levels during the pumping test location and construction details of new and existing wells depth setting and type of pump in control well

pumping duration and rate pumping rate measurement and control water-level measurement and frequency strategy for disposal of collection of water quality estimates of aquifer pumped water samples during pumping properties from previous work or literature data location and orientation of streams, faults, lithologic contacts and other potential aquifer boundaries potential for salt water intrusion in coastal areas field equipment prediction of pumping test response impact of pumping test on nearby water users