Hydraulic Structures: Fourth Edition

Worked Example 12.3 The monthly flow of a river supplying water to a power plant in 14 succes- sive 4-week periods of the driest ...

0.92 m^3 s^1 2.23 106 m^3 per 4-week period. Improved accuracy in calculating the required reservoir capacity can be achieved ...

power outputgQH332 kW, assuming a Francis-type turbine (low head, small discharge and efficiency of around 92%). The reserv ...

Worked Example 12.4 In a pumped-storage hydropower project, water is delivered from the upper impounding reservoir through a low ...

and so net head 300 2.13 9.73288.14 m, output/turbinegQH/10^6 55 MW, total output 4  55 220 MW. The net output of the ...

For one unit rejection or demand, Q 0 21.7 m^3 s^1 andP 0 2.13 m. Therefore ZmaxQ 0 /Asr11.63 m and K* 0 P 0 /Zmax0.183. U ...

wherehfis the system losses. Ignoring minor losses, Manning’s formula gives hfQ^2 n^2 L/A^2 R4/30.0155Q^2. Therefore 2  6000 ...

Assuming a specific speed of, say, 500, the power per machine (NsH5/4/N)^2 11 377 kW. Therefore the number of units is 30 000/ ...

The average output of the plant is 300.412 MW. The units will be designed to produce this power most efficiently and any varia ...

° from nose 0 30 60 90 120 180 240 H 0 (m) 1.40 01.85 02.30 02.75 003.20 004.10 005.00 Knowing that r 1 (H 0 h 0 )/
r 0 , eq ...

References Aqua-Media International (2004) Hydropower and Dams World Atlas and Indus- try Guide, Aqua-Media International, Sutto ...

Gosschalk, E.M. (2002) Reservoir Engineering: Guidelines for Practice, Thomas Telford, London. Gulliver, J.S. and Arndt, R.E.A. ...

Chapter 13 Pumping stations 13.1 Introduction Pumping facilities have to be provided for water supply if economical gravity syst ...

13.2.2 Types of pumps Pumps may be classified as rotodynamic (radial (centrifugal), axial or mixed-flow type)) and reciprocating ...

pumps. Anderson (1994) and Wislicenus (1965) give details of construc- tion and performance characteristics of pumps. For a deta ...

13.2.4 Pump operation A typical installation of a centrifugal pump, transferring water from a sump (low level) to a higher eleva ...

From dynamic similarity criteria, the corresponding discharge and head that a pump can develop with varying speed are written as ...

and Thoma’s cavitation number, , given by (equation (4.14)) NPSH/Hm, (13.10) is found to be related to specific speed. The NP ...

Electrosubmersible units, which are in widespread use nowadays, eliminate the need for suction pipes, and the problems of cavita ...

tion. For varying discharges the unit may be throttled over an operational range at the expense of the head. However, the extent ...