《周礼·地官司徒·叙官》
川衡，每条大河由下士十二人担任，史四人，胥十二人，徒一百二十人；每条中等河流由下士六人担任，史二人，胥六人，徒六十人；每条小河由下士二人担任，史一人，徒二十人。
川衡，每大川，下士十有二人、史四人、胥十有二人、徒百有二十人；中川，下士六人、史二人、胥六人、徒六十人；小川，十士二人、史一人、徒二十人。
Chuan heng, each large river was served by twelve lower-ranking officials, four historians, twelve scribes, and one hundred and twenty laborers; each medium river was served by six lower-ranking officials, two historians, six scribes, and sixty laborers; each small river was served by two lower-ranking officials, one historian, and twenty laborers.