Time

Before the Ming Dynasty

Ming and Qing Dynasties

The Republic of China

After the founding of PRC

The reform and opening up

From the reform and opening up to 2010

After 2010

Functions

Moat

Drainage canal

Drainage and supply canal

Caomi Lan

Living river

Water traffic

Transportation

Household by the river

Pollution discharge

Dilapidation

Drainage

Watching and entertainment

Construction situation on both sides

Open countryside on both sides

No construction

Covered with self-constructed houses

Buildings on both sides become dense gradually

Large-scale construction, many high buildings rise

Restore the environment on both sides, and increase green space

Type of urban public activity

None

None

Water traffic and waterborne trade

Leisure activity and fair along the river

Leisure activity along the river

Fair along the river

Fade away

Revive original activities

Develop some new activities.

Typical

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