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The design of a vertical drop weir consists of (see Fig. 4.19): i. Hydraulic calculations to fix various elevations, ii. Design of weir wall, iii. Design of CH4-2 :Design of Vertical Drop Weir: · 1- Waterway (L):. Use lacey wetted perimeter equation: P =4.83 Q = 4.83 2680 = 250m. L= (1-1.2) p, this means L between Hydraulic calculations to fix various elevations, ii. Design of weir wall, iii. Design of impervious floor (apron), iv. Design of protection works on upstream WATER COURSE AND WEIR PARAMETERS. River data. Soil data. Soil type. Design discharge. (Q) m3/s Soil description. Fine sand. River bed gradient. Vertical drop weir is such a weir, whose D/S face is given steep batter. The U/S face is mostly vertical, but it can also be given batter like D/S face. 61. Design of Vertical Drop Weir Diversion Headworks • A vertical drop weir consists of a masonry/concrete crest wall with its d/s face vertical (or nearlyClassification - based on material of construction & design features -. ? Masonry weir with vertical drop or vertical drop weirs.