In Dying Light 2 Stay Human’s Water Tower quest, you are given the first choice on which side to designate the base and city area for: Peacekeeper (PK) or Survivor? This happens regardless of whether you have choose to help Jack and Joe. Whether you give the Horseshoe Water Tower to the Peacekeepers or the Survivors partly depends on How do you feel about each gender? and its role in the story, and partly your preferred play style.
Giving this Water Tower, or any other facility, to a Peacekeeper will unlock Peacekeeper missions and special combat-based Zone Effects in any Zone which is controlled by the Peacekeeping Force. Choosing the Peacekeeper for the first time will unlock the Trap, attract the Infected, then blow it up. Giving this Water Tower or any other facility to a Survivor will unlock missions for Survivors and parkour-based Zone Effects. The first Survivor Zone effect is ziplines, which will make it easier for you to traverse Survivor-controlled Zones.
There are 14 Area Effects, but only 7 bases can be assigned. This means you can get all Zone Effects from one faction, or split Zones more evenly between Peacekeepers and Survivors for a more balanced playstyle, but you can’t have all Zone Effects are active at the same time.
https://www.gamepur.com/guides/who-should-you-give-the-horseshoe-water-tower-to-in-dying-light-2-stay-human-peacekeepers-pk-or-survivors Who should you give Horseshoe Water Tower to in Dying Light 2 Stay Human? Peacekeeper (PK) or Survivor?