水头压力，意思是根据伯努力方程计算出的数据。
为了提供精确的水头压力参数，管线应该连接到水柱的底部。
To provide accurate reading of head pressure , the line should connect at the base of the water column.
结果表明，土壤孔隙率在毫米尺度上存在较为明显的差异，在水头压力下，孔隙率随着深度增加而变大。
The result showed the evident existences of the variability of porosity in soils on mm-scale. Under the stress of water, pore becomes more and more bigger with the deepne…
利用支持向量机推求管网节点水头和供水泵站供水量、供水压力的非线性关系。
The nonlinear relation between node pressure head of the pipe network and water capacity and pressure of water supply pump station was deduced by SVM.
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