Historical clue formulations

• Some water bearers — 2024-01-24
• Primary pipes — 2022-12-18
• Major pipes — 2022-01-17
• Important pipes — 2020-10-12
• Big pipes — 2018-01-11
• Major conduits — 2016-08-31
• Sewer parts — 2011-12-24
• Sewers have them — 2010-03-04
• Principal pipes — 2005-12-01
• Large pipes — 2004-07-11
• Underground conduits — 2003-07-03
• Principal pipes — 2003-04-24
• Big pipes — 2002-12-08
• Water conduits — 2001-09-30
• Water pipes — 2001-05-14
• Pipelines — 1997-03-16
• Water pipes — 1995-07-20
• Sewer connections — 1994-05-28