The water way from a weir is determined by using Lacey’s wetted perimeter i.e. P=_______(Q)1/2 ? March 29, 2019 – by admin The water way from a weir is determined by using Lacey’s wetted perimeter i.e. P=_______(Q)1/2 ? A. 3.50 B. 3.75C. 4.75 D. 5.75