Power Systems
The factor affecting run off are

 amount of vegetation and weather condition in the catchment area.
 the topography and nature of soil in the catchment area.
  all of above.
 rain fall pattern, shape and size of catchment area.

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Power Systems
An hydro-graph indicates

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

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