Power Systems
An hydro-graph indicates

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

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Power Systems
An impulse turbine

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

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