The results of estimation show that BP neural network can estimate farmland drainage accurately with the largest relative error only of-2.45%.

估算结果表明利用BP神经网络可以准确地估算农田排水量，最大相对误差仅为-2.45%。

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Some key technical problems have been amended, for example, leakage of hydraulic pressure bursa, control of drainage, analysis of apparatus system error, design of accessorial equipments, and so on.

解决了该仪器系统存在的几个关键技术问题，如液压囊漏水问题、排水控制问题、仪器系统误差分析、附属设备的设计等。

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The influential factors of calculation error for groundwater table are discussed by using the iteration method to find solution of numerical model in the mine drainage forecast of deep drawdown.

本文讨论了大降深矿井排水预测中 ，利用迭代法求解数值模型时 ，地下水位计算误差的影响因素。

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