Power Systems
Gross head of an hydroelectric power station is

  the difference of water level between the level in storage and tail race.
 all of above.
 the height of water level in the river where the tail race is provided.
 the height of water level in the river where the storage is provided.

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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.
 rain fall pattern, shape and size of catchment area.
  all of above.

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