From ZDoom Wiki
220:Sector_SetCurrent (tag, amount, angle, useline)
- tag: Tag of affected sector
- amount: Strength of the current
- angle: Angle the current flows
- useline: Whether to get the strength and angle from the line instead
If useline is 1, this behaves just like BOOM's 225 linedef. If useline is 0, then the amount and angle parameters are used instead of the size and orientation of the line.