Power Systems
An hydro-graph indicates

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

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Power Systems
An impulse turbine

  operates by initial complete conversion to kinetic energy.
 always operates submerged.
 makes use of a draft tube.
 is most suited for low head and high discharge power plants.

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