在河道上采取分洪措施时的分洪起始水位。分洪水位是根据分洪口以下原河道安全泄量确定的。河道冲淤变化不大的河流,其水位流量关系比较稳定,在分洪口处,相应分洪 The initial level of flood diversion when flood diversion measures are taken on the river course. Flood diversion level is determined according to the safety discharge of the original river below the flood diversion port. River scouring and silting little change in the river, the water level of the relationship between the relatively stable, at the flood port, the corresponding flood diversion