一、引言假使物质内有连绩的孔隙存在,我们就知道它有透水性。一般土壤,甚至极其坚硬的黏土,都有连绩的孔隙。此外非金属的物质,如完美无疵的花岗岩,以及纯净的水泥,都是略有透水性的。而水在这些物质中渗透的情形,差不多都遵守同一定律。沙砾与花岗岩的透水性,只是程度上的不同罢了。土壤的 I. INTRODUCTION If there are holes in the material that have a track record, we know that it has water permeability. Ordinary soil, even extremely hard clay, has the performance of the pores. In addition, non-metallic materials, such as the perfect granite, as well as pure cement, are slightly water-permeable. Whereas the penetration of water into these substances almost always follows the same law. Permeability of grit and granite is only a matter of degree. Soil