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Seepage Face Height, Water Table Position, and Well Efficiency at Steady State

机译：稳态时的渗流面高，地下水位和井效率

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摘要

When a fully penetrating well pumps an ideal unconfined aquifer at steady state, the water table usually does not join the water level in the well. There is a seepage face inside the well, which is a key element in evaluating the well performance. This problem is analyzed using the finite-element method, solving the complete equations for saturated and unsaturated flow. The seepage face position is found to be almost independent of the unsaturated zone properties. The numerical results are used to test the validity of several analytic approximations. Equations are proposed to predict the seepage face position at the pumping well for any well drawdown, and the water table position at any distance from the pumping well for any in-well drawdown. Practical hints are provided for installing monitoring wells and evaluating well efficiency.
机译：当一个完全穿透的井在稳定状态下泵送理想的无限制含水层时，地下水位通常不会加入井中的水位。井内有渗漏面，这是评估井性能的关键因素。使用有限元方法分析该问题，求解饱和和非饱和流的完整方程。发现渗流面位置几乎与不饱和带性质无关。数值结果用于检验几种解析近似的有效性。提出方程式以预测任何井抽水时抽水井的渗水面位置，以及任何井内抽水时距抽水井任何距离的地下水位。提供了有关安装监控井和评估井效率的实用提示。

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