Field monitoring indicates significant drawdowns in groundwater heads in the vicinity of the well.
Results were validated by comparison of observed versus predicted drawdowns and with field and laboratory measurements of Kh and Kv made along the tested well.
The problem of drawdown and determination of velocity field near a fully penetrating pumping well which is located in a confined aquifer is investigated.
The model is extended to a borehole or perforation in the field and a suitable expression for the critical drawdown for sand production is derived.
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After a steady-state flow field is reached and the pumping rate and chamber drawdowns are measured, a tracer is released into the injection chamber, and the concentration breakthrough curve is recorded in the extraction chamber.
The main flow behaviors evident in the field data were simulated, particularly (i) the early-time inflection of the drawdown signal at certain observation wells and (ii) the convex behavior of the drawdown curves at intermediate times.
The field-scale problem is an aquifer in California with large historical drawdown.
Maximum drawdowns of about 0.05 m were analytically estimated from field investigations where environmental fluctuations approached 0.2 m during the analysis period.
As expected, this less channeled, beneficial flow field leads to a higher production temperature and slows the rate of thermal drawdown.
