The tunnel diversion for once damming dam is adopted in the construction of Songjianghe river cascade Shuanggou water power station A large number ice is discharged through the diversion tunnel during the engineering construction.

• 松江河梯级双沟水电站大坝导流采取一次拦断河床,隧洞导流的方式,工程施工期间,大量冰块将通过导流洞排泄。