For example trench excavation for plumbing pipes are governed by the same rules of measurement as trench excavation for drain pipes.
为安装水管所进行的渠道开挖的工程量所用的计算规则条目，与为排水渠所开挖的工程量是相同的。
Ultra excavation: cable trench excavation shall not exceed the bottom elevation. If ultra-dig in some places, obtain the consent of design units.
沟底超挖：开挖矿用电缆沟不得超过沟底标高，如个别地方超挖时，其处理方法应取得设计单位的同意。
Slope with slow slope rate, Foundation trench excavation of earth and backfilling of earth are both relatively larger and the project is not economic;
基槽边坡坡率采用过缓，基槽开挖量和回填量均较大，工程不经济；
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