Using the measured data on 15 laboratory models in USA, six and one prototype Turkey, discharge coefficients (C’s) of radial-gated ogee spillways for various gate openings lake water surface elevations are computed. Comparison these C’s 22 with ones given by Figure 9-31 Design Small Dams does not show close agreements. It is determined that C depends both angle Ɵ ratio d/H1, rather than only wh...

The goal of this research was to determine the impact a pooled and flat stepped spillway on energy losses. FLOW3D, which is computational fluid dynamics (CFD) program, with mesh size 0.015 mm used for purpose. First, code tested against an available experimental model data both water flow depth inception point position. outcome precisely shows agreement laboratory work. Second, dissipation resi...

In this paper, we counted the ascending curimbatás at the fish ladder at the Cachoeira de Emas from October, 1992 to September, 1993 in one whole day (24 h period) per month at different observation points in the dam for 5 min every hour. Most of the fish (80%) were counted not in the fish ladder itself, but in two adjacent spillways at its left, perhaps due to the comparatively increased flow ...

Hydraulic Energy dissipators are devices to protect downstream areas of basin from erosion by reducing the velocity of flow up to an acceptable limit. The stilling basins are transition structures fabricated to dissipate excess energy confined by flow with high velocity at the outlet of conduit or tunnel so that the flow beyond the basin does not threaten the firmness of bed and banks of downst...

In the last three decades the design of stepped spillways regained some interest because of their suitability with new construction methods including gabion placement. In this study, the hydraulic performances of gabion stepped weirs were investigated experimentally in terms of the air-water flow properties and energy dissipation rate. A physical study was performed in a relatively large size f...

As an alternative to ski jumps, deflectors can be implemented on spillways to generate free jets. They guide, up to a certain limit, the jet to an achieved location onto the plunge pool surface, and furthermore enhance the process of jet disintegration. The present research addresses the following aspects, derived from physical model tests: (1) length and shape of the jet black-water core and f...