A single square was opened and a built water reservoir dating to the Byzantine period was discovered, but not completely exposed. A rectangular reservoir (inner dimensions 3.55×4.00 m, min. depth 5.49 m, min. capacity 86 cu m; Fig. 4), oriented northwest-southeast, was exposed beneath a thick layer of alluvium that was mostly removed with the aid of a backhoe. The walls of the reservoir (W2, W4, W7, W9; width 0.3 m; Fig. 5) were thin and built of small fieldstones bonded with gray mortar. The inside surface of the walls was coated with pinkish orange hydraulic plaster that contained grog. The plaster at the bottom part of the pool was applied to an extremely thick layer of gray plaster embedded with ribbed potsherds, and therefore, the corners of the reservoir were rounded (Fig. 6). The hydraulic plaster in the upper part was applied to a thin layer of gray plaster impressed with short diagonal and parallel lines.
Remains of three arched courses (Fig. 7) were exposed in the longitudinal walls—Wall 2 in the southwest (length 4.10 m, min. height 4.92 m) and Wall 7 in the northeast (length 4.75 m, min. height 1.25 m)—indicating that the reservoir was covered with a vault, which was built of roughly hewn stones and small and medium fieldstones with stone wedges and debesh in-between, bonded with gray mortar. The base of the vault (width 0.6–0.7 m) was wider than the longitudinal walls that bore it, and the rest of its width protruded from the wall and was founded on the natural ground (see Fig. 7). The upper parts of the reservoir’s lateral walls, Wall 4 in the northwest (inner length 3.65 m, min. height 3.64 m) and Wall 9 in the southeast (inner length 3.55 m, min. height 5.49 m), which closed the vault, were also wider (0.45–0.50 m) than their supporting bottom parts.
A tiny horizontal rectangular niche (length 0.38 m, width 0.25 m, depth 0.3 m; Fig. 8) was exposed at the top of W4, below the vault and next to its corner with W2.
The reservoir was built into the natural brown ground to the top of the longitudinal walls. Fill of pebbles and brown soil was deposited on the natural ground, abutting the outside of the upper parts of the lateral walls and the bottom course of the vault on both sides (Fig. 9). Several non-diagnostic potsherds were discovered in the fill layer.
The fill in the water reservoir was excavated to a depth in excess of 6.5 m from the surface, yet the floor of the reservoir was not exposed. The construction of the water reservoir is dated to the Byzantine period, based on ribbed potsherds of baggy-shaped jars that were embedded in the foundation layer for the plaster on the installation’s walls. The fill in the reservoir contained stone collapse, mostly from the vault, layers of alluvium, debris and several ceramic artifacts. The pottery included a Late Roman C bowl of Hayes’ Type F (Fig. 10:1; Hayes J.W. Late Roman Pottery. London, pp. 331–335, Fig. 69), dating to the sixth century CE; an open cooking krater (Fig. 10:2), and a jug (Fig. 10:3) from the Byzantine period, as well as a handmade jar decorated with brown painted geometric patterns (Fig. 10:4) and a non-slipped glazed bowl (Fig. 10:5), with blue, green and yellow decoration on the outside and brown on the inside, dating to the Mamluk period.
The water reservoir was built in the Byzantine period and probably abandoned at the end of the period. The earliest possible date for the final destruction of the reservoir is in the Mamluk period.
There is no clear evidence as for the source of water that fed the reservoir. No feeder channels were exposed and no signs of places where water entered the reservoir were found. Furthermore, the water sources in the region are far away from the reservoir and no ancient aqueducts are known in the vicinity of the reservoir. Therefore, the reservoir was presumably filled with rainwater that was drained from the roofs of buildings in the eastern area of the ruin. In addition, the runoff that flowed into the channel near the reservoir to the south was probably diverted and conveyed into it. Presumably, the reservoir’s water was used by the inhabitants of the ruin, intended for drinking, watering animals, some agricultural crops or crops that required meager amounts of water and perhaps industry as well. In addition, the building remains at the ruin probably belonged to a farmstead that sustained itself mainly on growing non-irrigated crops.