5 ft along bridge .2 + .8 depth, add +2 .6 when that is impracticable, = mean. subsurface. With wheel of meter just below water, multiply this by .9 = mean. meter can be placed below the weight. For mean velocity divide Total D discharge by Total Area. Use hand mark on bridge and move away from bridge. In case of freshets use 10 ft or 15 ft interval to get across section quick. Find angle of water to bridge. Corrections must be made with bridge vertical, Rising or rising stage is greater than in falling stage. New York Standard Watch Co. Forbnscher. Locks. Wolf Cr. Culley Cr. Rosena Kindle, Straw and Bigtim Cubbery.