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Copy of Dujiangyan Irrigation System

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Julia Cai

on 3 September 2013

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Transcript of Copy of Dujiangyan Irrigation System

Dujiangyan Irrigation System
Background Knowledge
How does it work?
Construction and Engineering
-The area near the project is called Chengdu Plain, including the city of Chengdu (15 million people) and surrounding counties of 7 million people.
-The area of Chengdu plain is approximately 8,000 square kilometers. (7,124 km² in GTA)

When? Who?
- The project started in B.C.E. 256, during the late Warring States period, by the Qin Kingdom.
- The construction is even earlier than the oldest sections of the Great Wall.
- The project was initiated by Li Bing, who at that time, was the magistrate of the area.

The Purpose
-Solution was to build a irrigation system
-First purpose: to control flooding
-Second purpose: to irrigate Chengdu Plains
System Components

- The irrigation system was made of two subsystems: the Weir Works and the water distribution network
- These engineering works fully blended with the features of local topography and landforms

- Weir Works: two functions
- Water and sand control
- Critical for long term success of water works
- achieved through cooperation of weir works components

Water Control
Bottleneck Passageway
- Dug out of the cliff
- Controls water to make sure the Chengdu Plains never flood
- Works Together with the Flying Sand Floodgate
Construction Stages

- Li Bing spent 2-3 years to do research and investigations along the Mingjian River: and the construction of the project took about 18 years to complete.
- Later improvement to the Dujiangyan Irrigation System are mainly on building materials
-First the bottleneck was built, the other parts were constructed after to gain more control
Engineering Principles
- The location of the Weir Works was selected to have a 200+ m water head from the water outlet to the Chengdu Lowlands.
- The coupling among the Fish Mouth, the Flying Sand Floodgate and the Bottleneck ensures the fine control of the water and sand
- Hydrological monitoring has been performed since the beginning of the project.
- The understanding of river engineering was integrated into the design, construction and maintenance of this project.

Living Legacy
- No need to worry about droughts or floods anymore, bountiful harvest year after year, people settled into a laid back/care free way of life
- All of the culture, food, lifestyle and history is built off of the construction and great success of Dujiangyan.
- Since Han dynasty, Chengdu Plain has developed into the politic, cultural and economic center in the Southwest China.
- It shows China’s immense advancements in science and engineering in ancient times
By: Julia Cai
- First stage: Fish mouth
- Flood season-more water
- Dry season-less water
- How? River shape and land form
- Second stage: Flying Sand and Bottleneck
- Work together

-The project is located in the southwest part of China in Sichuan province.
- Li Bing and his son (Er-lang) designed and led the construction of the project.
- The Weir Works has 3 main components: the Fish Mouth, the Flying Sand Floodgate and the Bottleneck
- It divides the Minjiang river into two, the inner and outer river.
Water Control Data
Irrigated Area
Sand Control
- The designers and constructors also instructed the best maintenance practices for the later 2,000 year: “Dig the river bed deep and make the weir low at the Flying Sand Floodgate” .
- A carved stone horse was buried in the riverbed to indicate the ideal depth that the yearly dredging should reach
- Critical depth was derived from the
fundamental theory of river profile equilibrium.

- An Engineering Miracle
Irrigated Area
River Equilibrium Profile
UN World Heritage Site
- The Criteria that UN Approved Dujianyan Irrigation System as one of the World Heritage Site:
- Criterion (ii): The Dujiangyan Irrigation System is a major landmark in the development of water management and technology.
- Criterion (iv): The immense advances in science and technology achieved in ancient China are graphically illustrated by the Dujiangyan Irrigation System.
- They express the importance of utilizing natural features to their fullest in constructing an irrigation system.
- The Dujiangyan Irrigation System demonstrates the outstanding universal value of the property.
- Dujiangyan is not only a living heritage of 2,000 year-old design and engineering; it also irrigates 668,700 ha farmland in 34 counties today.

Outer River
Inner River
Outer River
Inner River
Fish Mouth
Flying Sand Floodgate
Inner River
Flying Sand
Outer River
Full transcript