Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with reaction and adjustable vanes is

 Pelton.
 Francis.
 Impeller.
  Kaplan.

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Power Systems
An hydro-graph indicates

 the maximum and minimum run off during the period.
 the average run off during the period.
All of these
 the discharge at any time during the period under consideration.

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