A step drawdown test on a well is conducted to determine:
Choose the correct answer
Aquifer transmissivity only
The components of well loss (formation loss = Cq, and well loss = Bq^n) to assess well efficiency and determine optimum pumping rate
Aquifer storativity only
Natural groundwater gradient
Correct Answer
B. The components of well loss (formation loss = Cq, and well loss = Bq^n) to assess well efficiency and determine optimum pumping rate
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Step drawdown: pump at 3-4 different rates Q1<Q2<Q3<Q4, each for equal duration (typically 2h). Total drawdown s_w = BQ + CQ^2 (Jacob method): BQ = formation loss, CQ^2 = turbulent well loss. Well efficiency = formation loss/total drawdown x 100%. Optimum Q where diminishing returns makes additional drawdown uneconomical.
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