(一)为什么要创造收方水平尺收方在修堤筑坝工程中是一桩极重要的工作,用皮尺量方坑的长和宽,尚称合适,即偶而差一公寸,影向的土方至多不过几分土,可是用它量深度,问题就多了。方坑四边高低不一,差一公分就差好几方。我们要想使公私都不吃亏,就只好用一根公尺,一个人拿着一头,将一头放在方坑沿上,另一个人站在较远的地方,看公尺 (A) Why do we need to create a harvesting level ruler Rectified dam works in the embankment project is an extremely important task, with a square measuring the length and width of the pit, is still appropriate, that is, even by one inch difference, At most, however, a bit of earth, but with the amount of depth, the problem is much. Pit side of four different levels, poor one after several poor side. We want to make public and private do not suffer, we had to use a meter, a person holding a head, will be placed on a square pit along the other person standing in a farther place,