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Tongjian Lake was a key ferry point in Hangzhou. Over time, sediment from the Qiantang River and land reclamation projects caused the lake's waters to recede. This led to local water shortages, flooding problems, and a fragile ecosystem. The project improved water circulation and raised water quality. It also met the 20-year return period standard for flood control. The region's ecological environment has improved significantly. Biodiversity has increased, and rare species are appearing. Tongjian Lake has become a beloved ecological park, natural education center and community gathering space.