Studies of enlarged property of underdrainage. VIII. Determination of drain spacing

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  • 暗キョ排水の機能増進に関する研究 Ⅷ. 暗キョ排水間隔の決定
  • 暗キョ排水の機能増進に関する研究-8-暗キョ排水間隔の決定
  • アン キョ ハイスイ ノ キノウ ゾウシン ニカンスルケンキュウ 8 アン キ

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Abstract

We have many methods to determine the spacing between drain tubes of the underdrainage. The author examined several experiential and theoretical methods, and then partly modified these methods. In case of the lowering of the groundwater table by underdrainage, the author proposed a new coefficient, a seepage coefficient "u", since "f" (porosity of the soil, drainable pore space) by using the theoretical methods has a drawback. As already shown in the last report, the value "u" is transformed by the lowering of the groundwater table stored in the pores of the soil with the gravitational water. Table 9 shows the spacings between drain tubes of the underdrainage, we showed how to calculate the spacings under the specified hydraulic conditions.

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