Single projects have limited environmental impact, but as the impact of the system as a whole cannot be ignored.The system of projects disturbs natural processes within and out of the river.

• 若从单个工程来看，其环境影响不大，但从整个工程体系来看，其对环境的影响不容忽视：绵长的工程干扰了河道内外的自然平衡，影响了生物多样性；