May be of Hellenistic origin when cistern system went out of use.
For a general note on the cistern see Nb. ΟΕ III, pp. 246 ff.
Objects from B 586 various depths (no subdivision): S 2324-S 2330,
P 34894, ... Late 2nd-early 6th c. A.D.
Filling of Middle Drain (Tr. H+F in Section Ζ). Sand and gravel filling of the old course of the west branch of the Great Drain, a large (ca. 1.00m. deep and 1.30m. wide) underground channel in the area ... 150-100 B.C.