Barrage

Yes — to play with 5 players you must have The Leeghwater Project expansion (p. 1).

When you place Engineers in the upper action spaces you choose one of the illustrated actions; when you place them in the lower action spaces you activate a production (p. 1).

Randomly place 5 Headstream Tiles in the designated spaces, and place 3 Neutral Dams as specified (a level 1 Dam in the Mountains, level 2 in the Hills, level 3 in the Plains); you may randomize the Neutral Dams by any method since the base-game setup tiles can't be used (p. 2).

Add the new Private Contract tiles to their respective piles before shuffling the three piles, and the new Contracts can be used in all games from now on (p. 2).

Use the Reference Map: look at the first letter on the Criteria tile and, if it isn't a tied Headstream, choose the first tied Headstream to the right of the indicated one, wrapping from X back to A (p. 2).

Automa place Engineers on the Extra Actions Board after Workshop/Machinery Shop/Water Management/Contract Office actions if the corresponding main-board action spaces (left or right) are all occupied, and after a production if the first three top-most action spaces on the left or right of the Turbine Station are already occupied (p. 2).