Power Systems
The factor affecting run off are

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

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Power Systems
In boiler water reactor (BWR)

 the feed water acts both coolant and a moderator.
 there is danger of radioactive contamination of steam.
  all of above.
 enriched uranium is used as fuel.

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