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兴建灌溉渠系,免不了与淘道相交,修建交叉建筑物。当沟底高程高于渠底高程时,一般用涵洞或排洪槽;当沟底高程低于渠底高程时,一般用渡槽或倒虹。那么,当沟底高程与渠底高程相等时,该建什么类型交叉建筑物呢?临县湫河灌区有一条安歧渠,全长15.25公里,灌溉面积6千余亩。全渠与20余条大小沟道相交,除安业沟外,或渡槽、或倒虹、或排洪槽都修了交叉建筑物。为什么安业沟不修交叉建筑物呢?因为这里沟底高程与渠底高程相等,渡槽、倒虹、涵洞、排洪槽都不能直接适用。
The construction of irrigation canal system will inevitably intersect with Amoy Road to build cross-linked buildings. When the groove bottom elevation is higher than the elevation of the canal, the general use of culverts or drains; when the groove bottom elevation is lower than the elevation of the canal, the general use of aqueduct or inverted rainbow. So, when the ditch elevation and canal bottom elevation equal, what kind of cross-type buildings should be built? Linxian Bahe Irrigation District has an Anqi drainage, a total length of 15.25 km, irrigated area of more than 6 acres. The whole canal intersects with more than 20 large and small channels, except for An Yungang, or the aqueduct, inverted siphon, or draining trough all have crossed-over buildings. Why Andean ditch uncompromisingly cross the building? Because the ditch at the bottom elevation here and the same elevation, aqueduct, inverted rainbow, culverts, drains can not be directly applied.