Their records state that Duke Zhuang had given Sunshu Ao the responsibility and oversight of the construction of a large river dam that would create an enormous planned reservoir for means of agricultural irrigation.
Catatan mereka menyatakan bahwa Duke Zhuang telah memberi Sunshu Ao tanggung jawab dan pengawasan pembangunan bendungan sungai besar yang akan menciptakan waduk besar yang direncanakan untuk sarana irigasi pertanian.