Hydraulic engineering; a practical treatise on the principles of water pressure and flow and their application to the development of water power, including the calculation, design and construction of water wheels, turbines, and other details of hydraulic power plants (1909)
American School (Chicago, Ill.), Black, Adolph, Turneaure, Frederick Eugene, 1866- · Chicago American School of Correspondence · leaf 45
S 23. The Francis Formula. The most widely used weirlonnuhi for large weirs without end contractions is that derivedby Mr. James B. Francis from an extensive series of experimentson weirs 10 feet long. Ilis formula is Q = 3.33 JHs, (25) in which the unit of length must be the foot. This is… … Fig. 26. one end contracted and by .2 II for both ends contracted. Theformula is further uiodified to allow for velocity of approach, butwhere this element enters, use may be made of the other formula.24. Submerged Weirs. Where the water on the down-stream side of a weir is higher than the crest,…
