This architectural drawing is a Cross section of the cistern tank design in detail AutoCAD 2D drawing, CAD file, dwg file. Runoff from rooftops is primarily collected by cisterns or rainwater collection systems. Cisterns can occasionally be used to store pavement runoff temporarily. The size of a cistern, which can hold 50 gallons to thousands of gallons of runoff, is simply a tank. For more details and information download the drawing file. Thank you for visiting our website cadbull.com.