The Natural Resources Conservation Service (NRCS) has assisted local sponsors with analysis, design and construction of approximately 26,000 of the 80,000 dams in the National Inventory of Dams. Many of these dams are reaching their design life and require rehabilitation. Rehabilitation efforts come at a time when NRCS is in the process of evaluating a potential change from a minimum 6-hour sto...

One of the most important conflicts that shaft spillways have to deal with is vortex formation. This phenomenon leads to some unfavorable effects such as vibration in the body of structures, air entrainment and reduced overflow capacity of the spillway. Among all solutions for disrupted vortex formation, an innovative one called circular piano-key spillway, based upon piano key weir principles ...

In the stepped spillway, steps, by providing an artificial roughening bed, dissipate flow of energy more than other types spillways, so construction costs for stilling basin are reduced. However, what is important in this type spillway increasing effectiveness steps rate dissipation. The present study deals with experimental and numerical simulations regarding influence geometric appendance ele...

Cavitation is among the most complicated and common damages of spillway structures. This phenomenon is controlled by different parameters including the pressure, flow velocity, spillway surface material, operation time, and air flow content. The cavitation index is calculated along the spillway and compared with its critical value using the measured values of the flow’s hydraulic parameters. Th...

Abstract Stepped spillways are suitable and economical options for high-storage dams that require significant energy dissipation, structural adaptation to roller-compacted concrete dams, spontaneous flow aeration. In this study, a numerical analysis of the hydraulic characteristics skimming regime stepped spillway Zirdan Dam is carried out. A comparison between smooth provided. By preparing mod...