Hydraulic Structures: Fourth Edition

6.3.3 High-head valves Thecone dispersion(Howell–Bunger) valve (Fig. 6.6) is probably the most frequently used type of regulatin ...

downstream direction. When open, the valves produce solid circular jets and can also be used in submerged conditions. The valves ...

are 220 m long. The gates have a unique ball (pivot) joint 10 m in diameter. Under normal conditions the gates are ‘parked’ in t ...

24 m diameter) the rotation of which raise or lower the gates, which in the open position are level with the river bed and in th ...

where a full analysis of the flow conditions and factors influencing them is really necessary. The most important factors on whi ...

CdCc  1 Cc H a  1/2 . (6.4) For a vertical gate the coefficient of contraction Ccvaries slightly between 0.6 and 0.61 (Hen ...

discharge coefficient will depend on the gate opening and upstream and downstream water depths – for guidance see Fig. 6.10 (e.g ...

plicated with the shape and size of the passage between the two gates playing an important part. 6.6 Cavitation, aeration, vibra ...

Vibrationof gates, if it occurs, can be dangerous – seal leakage, inter- mittent flow attachment, inadequate venting being the m ...

control systems and Lewin (2001) illustrates the application of such systems to automatic methods of gate control. The requireme ...

For comparison the hydrostatic force on the gate is P(3 0.826)^2 g/223.15 kN m^1. (ii)First trial Referring to Fig. 6.9 assume ...

Referring to Fig. 6.9 for y 1 /a3/0.9253.24 and y 3 /a2.1/0.9252.27. Cdcan be estimated also as about 0.5; (this procedure c ...

Kocahan, H. (2004) They might be giants, Int. Water Power and Dam Construction, March, 32–5. Kolkman, P. (1984) Gate vibrations, ...

Chapter 7 Dam safety: instrumentation and surveillance 7.1 Introduction 7.1.1 A perspective on dam safety Reservoirs constitute ...

290 DAM SAFETY: INSTRUMENTATION AND SURVEILLANCE is to reveal abnormalities in behaviour, and so to provide early warning of pos ...

INSTRUMENTATION 291 7.1.2 Tailings dams and lagoons A particular hazard is represented by tailings dams and storage lagoons. Int ...

instrumentation is now frequently installed retrospectively to monitor existing dams. In the context of new dams, instrumentatio ...

7.2.2 Parameters in monitoring dam behaviour The most significant parameters in monitoring dam behaviour are as follows: seepag ...

Table 7.2 Primary monitoring parameters and their relationship to possible defectsParameter Instruments Measurement Illustrative ...

INSTRUMENTATION 295 of time, possibly several decades. As guidelines underwriting sound design it is therefore desirable that in ...