You descend into the cistern and the cistern is the room that holds the rain. The cistern is underground. The cistern is dark. The cistern is cool and the cool is the earth keeping the water cold because the water must be cold or the water becomes something else. The cistern collects. The rain falls on the roof and the roof channels the rain to the gutter and the gutter channels the rain to the pipe and the pipe carries the rain underground to the cistern and the cistern holds it. The cistern is the savings account. The cistern holds what the sky deposits for the day the sky deposits nothing.

The Basilica Cistern in Istanbul held eighty thousand cubic meters of water beneath the streets and the holding eighty thousand cubic meters kept Constantinople alive during siege. The Emperor Justinian built the cistern in five thirty six and the building in five thirty six means the cistern has been underground for fifteen hundred years. Three hundred and thirty six marble columns hold up the ceiling and the three hundred and thirty six columns were taken from ruined temples and the taken from ruined temples means the cistern was built from the bones of older buildings. The water in the Basilica Cistern was still and the still water reflected the columns and the reflected columns made the cistern look infinite. The cistern fed the Great Palace through terracotta pipes. When the Ottomans conquered Constantinople in fourteen fifty three the cistern was forgotten. The cistern sat beneath the city for a hundred years with no one above knowing it was there. A scholar named Petrus Gyllius rediscovered it in fifteen forty five when he noticed that neighbors were drawing water through holes in their basement floors.

The cisterns of Bermuda collect every drop of rain that falls on the roof because Bermuda has no freshwater and no rivers and no lakes. Bermuda is limestone and the limestone is porous and the porous means the rainwater sinks through the rock to the saltwater below. The only freshwater in Bermuda is the rain that is caught before it touches the ground. Every roof in Bermuda is white and the white roof is limestone and the limestone roof is stepped and the stepped shape slows the rain and the slowing the rain lets the rain be collected. The rain runs down the stepped roof to the gutter and the gutter leads to the cistern under the house. The law in Bermuda requires every building to have a cistern and the requiring every building to have a cistern means the architecture of Bermuda is the architecture of water collection. The white roofs are not decorative. The white roofs are infrastructure.

In the American Southwest the cistern was life. The Ancestral Puebloans at Mesa Verde carved cisterns into the sandstone to hold rainwater and the holding rainwater in the desert was the engineering that made the settlement possible. The cisterns at Chaco Canyon collected runoff from the mesa and the collecting runoff from the mesa was the water management system that supported a civilization of thousands in a land that received eight inches of rain per year. Eight inches of rain per year. Every drop mattered. Every cistern was the difference between survival and abandonment. The pueblos were abandoned around twelve hundred and the abandonment coincided with a drought and the coinciding with a drought suggests the cisterns ran dry and the running dry meant the water was gone and the water being gone meant the people were gone.

You stand in the cistern and the water drips. The drip is the roof leaking or the pipe feeding and the drip echoes and the echo fills the chamber. The water level is low. The water level is always visible on the walls because the walls are stained where the water has been and the stained where the water has been is the cistern's memory. High water. Low water. The rings of the cistern tell the story of the rain the way the rings of a tree tell the story of the seasons. The cistern. The underground room. The three hundred and thirty six columns. The white roofs of Bermuda. The sandstone basins of Mesa Verde. The room that holds the rain. The architecture of thirst. The savings account beneath the house. The drip. The echo. The water waiting in the dark for the day it is needed. The cistern holds. The cistern waits. The cistern is patient because the rain is not.