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Abstract The transition curves of a nearly uniform flow state or, in general, the free surface profiles in open channels are designated backwater curves. They provide, for steady flow, the most general surface profile under a given discharge for specified boundary conditions. Usually, their computation is lengthy but they are required if backwater and drawdown effects have to be determined. Chapter 8 presents a simplified method to determine backwater curves. It is based on a differential equation which can be solved exactly. Therefore, no convergence criterion with regard to the length of the calculation step is needed. The procedure is detailed by describing the computational scheme and explained with examples. Apart from the circular section, the egg-shaped and the horseshoe sections as well as the rectangular section are also considered. Finally, the effect of the non-hydrostatic pressure distribution on the discharge is discussed.
Abstract The transition curves of a nearly uniform flow state or, in general, the free surface profiles in open channels are designated backwater curves. They provide, for steady flow, the most general surface profile under a given discharge for specified boundary conditions. Usually, their computation is lengthy but they are required if backwater and drawdown effects have to be determined. Chapter 8 presents a simplified method to determine backwater curves. It is based on a differential equation which can be solved exactly. Therefore, no convergence criterion with regard to the length of the calculation step is needed. The procedure is detailed by describing the computational scheme and explained with examples. Apart from the circular section, the egg-shaped and the horseshoe sections as well as the rectangular section are also considered. Finally, the effect of the non-hydrostatic pressure distribution on the discharge is discussed.
Backwater Curves
Dr. Hager, Willi H. (author)
Wastewater Hydraulics ; 216-262
2010-01-01
47 pages
Article/Chapter (Book)
Electronic Resource
English
General solution of backwater curves
| Engineering Index Backfile | 1931
| Engineering Index Backfile | 1949
Graphic determination of backwater curves
| Engineering Index Backfile | 1950
Characteristics on M1 Backwater Curves
| ASCE | 2021
Closure to “Characteristics on M1 Backwater Curves”
| ASCE | 2021