It was located outside the city walls but close enough to allow for a tunnel and a 36 - foot - deep [11 m] shaft to be excavated, which would enable the inhabitants to draw water without going outside the protective walls.
यह वॉरन कूपक के नाम से जाना जाता है, जो १८६७ में इस प्रणाली को खोज निकालनेवाले व्यक्‍ति, चार्ल्स वॉरन के नाम पर रखा गया ।