Power Systems
The factor affecting run off are

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

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Power Systems
A thermal power station needs space

 less than that required by the diesel power station of same output.
  less than that required by hydro-power station of same capacity.
 less than that required by atomic power station of the same output.
 less than that required by a gas turbine power plant of same output.

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