《墨子·71章 杂守》
将渠树立时不要靠在矫墙上，要离开五寸；梯渠十丈一梯，渠和荅大约是一里二百五十八步，渠、荅共一百二十九具。
树渠无傅叶五寸，梯渠十丈一梯，渠、荅大数，里二百五十八，渠、荅百二十九。
When erecting the canal, do not lean it against the retaining wall, but leave a gap of five cun; there is a ladder for every ten zhang of the canal, and the canal and the cover are about one li and two hundred and fifty-eight steps, with a total of one hundred and twenty-nine canals and covers.