《汉书·志·沟洫志》
现在西面各郡，以至京师以束，百姓都引黄河、渭水和山水灌溉农田。
今西方诸郡，以至京师东行，民皆引河、渭山川水溉田。
Now in the counties in the west, including the capital in the east, people all lead water from the Yellow River, the Wei River and the mountains and rivers to irrigate the farmland.