An underground tank for storing water. Rain water used to be collected and stored for use in the house. Still is in some places.
water is kept in a cistern
A water cistern is the part of a toilet that holds water which is then used to flush the toilet.
What size cistern what temp
A Roman cistern is the same as any other cistern. It is a tank for holding liquid, usually water. Some cisterns are/were used for waste water while others are/were used for fresh water.
The cistern.
A vacuum breaker is a device that prevents water in a toilet cistern or water tank, from syphoning back into the toilet cistern or water tank.
cistern
A cistern is usually an underground structure, but can be above ground which simply catches run-off water or rain water and keeps it until it is needed.
Put a brick in the cistern, so less water will fill it There are various things to reduce the amount of water in the cistern. Bricks are popular and so are plastic bags of water.
Large water tanks -x
cistern
cistern