현재 유량에서 슬롯 표면 유속이 최소 0.8 m/s 이상은 유지되도록 설계하여야 최대/최소 유속비가 3배를 넘지 않았다.
The maximum/minimum flow rate of the current flow rate was not more than three times when the slot surface flow rate was designed to be kept at least 0.8 m/s.