static void ChangeTileOwner_Water(TileIndex tile, Owner old_owner, Owner new_owner)
{
	if (!IsTileOwner(tile, old_owner)) return;

	bool is_lock_middle = IsLock(tile) && GetLockPart(tile) == LOCK_PART_MIDDLE;

	/* No need to dirty company windows here, we'll redraw the whole screen anyway. */
	if (is_lock_middle) {
		Company::Get(old_owner)->infrastructure.water -= 3 * LOCK_DEPOT_TILE_FACTOR; // Lock has three parts.
		if (GetWaterClass(tile) == WATER_CLASS_CANAL) Company::Get(old_owner)->infrastructure.water--;
	}
	if (new_owner != INVALID_OWNER) {
		if (is_lock_middle) {
			Company::Get(new_owner)->infrastructure.water += 3 * LOCK_DEPOT_TILE_FACTOR; // Lock has three parts.
		if (GetWaterClass(tile) == WATER_CLASS_CANAL) Company::Get(new_owner)->infrastructure.water++;
		}
		/* Only subtract from the old owner here if the new owner is valid,
		 * otherwise we clear ship depots and canal water below. */
		if (GetWaterClass(tile) == WATER_CLASS_CANAL && !is_lock_middle) {
			Company::Get(old_owner)->infrastructure.water--;
			Company::Get(new_owner)->infrastructure.water++;
		}
		if (IsShipDepot(tile)) {
			Company::Get(old_owner)->infrastructure.water -= LOCK_DEPOT_TILE_FACTOR;
			Company::Get(new_owner)->infrastructure.water += LOCK_DEPOT_TILE_FACTOR;
		}

		SetTileOwner(tile, new_owner);
		return;
	}

	/* Remove depot */
	if (IsShipDepot(tile)) DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);

	/* Set owner of canals and locks ... and also canal under dock there was before.
	 * Check if the new owner after removing depot isn't OWNER_WATER. */
	if (IsTileOwner(tile, old_owner)) {
		if (GetWaterClass(tile) == WATER_CLASS_CANAL && !is_lock_middle) Company::Get(old_owner)->infrastructure.water--;
		SetTileOwner(tile, OWNER_NONE);
	}
}