See M. Hecker, “Water Supply of Jerusalem in Ancient Times,” p. 194; see also Z. Abels and A. Arbit, “Some New Thoughts on Jerusalem’s Ancient Water System,” Palestine Exploration Quarterly 127 (1995), p. 4; and Z. Abels and A. Arbit, The City of David Water Systems, Supplement to Jerusalem’s Water Supply from the 18th Century B.C.E. to the Present (Jerusalem, 1994), p. 13.