Volume 1, Page 29 — Military Administration: Provisions and River Transport II

To the south of the High Dike original: "Gaoyan" lies the Outer Wall original: "Yuecheng"; a secondary defensive embankment. and the area around Zhou Family Bridge. The terrain here is somewhat elevated. When the Huai River rises significantly, it overflows from this point into White Horse Lake original: "Baima Hu". When the waters recede, it becomes dry land again. This area is utilized to mitigate the Huai’s floods; it functions exactly like a spillway reduction damA structure designed to allow excess water to escape the main channel to prevent dikes from breaching. for the Yellow River. If a continuous dike were built here, not only would the High Dike be impossible to defend, but...

Yuecheng (The Outer Wall) Dizhu Pavilion (Pillar of Strength Pavilion)Literally "The Pillar that Stands Against the Current."

The Zhai Family Area
Zhaijia Dam
Seven-Mile Mound
The Wu Family Mound

Major Breach in the Yellow River Dike

Yongji (Permanent Aid)

Wanjia Lake (Lake of Ten Thousand Families)
Tongji Lock (Lock of Universal Aid)

The interior of this lock is the Inner River The section of the Grand Canal protected by dikes., which has no natural source of flowing water. It relies entirely on the Huai and Yellow Rivers to enable navigation. Every year at the start of the sixth month Approximately July in the Gregorian calendar., when the Yellow River’s waters swell, a dam is built outside the lock to block the current. It is only opened during the Frost Descent A solar term beginning around October 23rd.. The silt deposited during this time is also easy to dredge.

Huai River Mouth

Ganluo City Huaian Prefecture River Management Office This is the location where the Huai River meets and joins the Yellow River. This is the very spot described in the "Tribute of Yu" The Yu Gong, an ancient geographical treatise from the Book of Documents. regarding the guiding of the Huai River from Mount Tongbai, meeting the Si and Yi Rivers to the east, and flowing into the sea. Since the completion of the High Dike and the construction of the Wangjian and Zhangfu dikes, the Huai River exits entirely through this point.

Great River Mouth original: "Dahekou"; referring to the confluence with the Yellow River, which was historically called the "Great River."