Power Systems
The factor affecting run off are

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

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 lowering the value of K below 1 but later bringing it back to K = 1.
 lowering the value of K below and keeping at that lowered value.
  raising the value of K above 1, but later bringing it back to K = 1.
 raising the value of K above 1 and keeping it at raised value.

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