What does it mean to find Cao Daosi's river defense manual work?

Soon, he was promoted to "a grass road", responsible for river affairs and flood control (water conservancy projects, etc.). ) and will attend (direct) in person.

Search: Soon.

"promotion"

Yizhou: Yizhou and Yizhou

Cao Dao: an ancient official name

Division: responsible for management

Hands-on: this needs no explanation, everyone understands.