Power Systems
The factor affecting run off are

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

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

 raising the value of K above 1 and keeping it at raised value.
 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.

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