Diciolla suggests keeping an eye on the outdoor discharge
line during cold periods, when frozen pipes can send water back into the pit and potentially overflow.
The red
line indicates the peak temperature anomaly of the past century, the blue
line indicates the current temperature anomaly, the shaded red circles indicate
periods in which temperatures were warmer than the peak warmth of the past century, and the shaded blue circles indicate
periods during the past century that were
colder than present.