AEBJM 发表于 2013-8-21 12:38
DTI 3.01 mean depth to invert 3.01m ( from ground level to depth of the invert of the manhole pipe ) ...
maksaihang 发表于 2013-9-1 00:42
invert level是管道中内径的最低点,dti=管道直径+泥土厚度,每个manhole都有inlet level 和 outlet level之 ...
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