'File 19/252 Bahrain Water Supply' [‎12r] (25/96)

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exceplion of a portion of the east side south of Sitra, and
furnishes water in drilled wells from Sitra around the north
of the island and to a point several kilometers south of
Zellaq- Information is scant from Zellaq around the south
tip of the island and back up to Sitra. The formation was re
cognisable at Ras al Barr although no definite production of
water was observed from It. At Umm Mattala between Zellaq
and Ras al Barr, there are only a few scattered samples and
random-bits of information; but it is almost certain from what
there is that conditions at Umm Mattala are much the same
as at Ras al Barr. There is no positive information at all
from Ras al Barr up to Sitra, but at Sitra Zone "B" is again
producing satisfactory volumes of water, although the salt
content is relatively high. The inconsistencies of this
formation are easily seen, but it remains by far the most pro
lific source of ptable water on the island. There are more
or less definite areas where it can be depended upon to furnish
great quantities, and for this part of the world, excellent
qualities of water.
Water Zone "C"
Water Zone "C !l is usually found from 150 to 200 feet
below Zone "B" although in some instances this interval may
decrease to as little as 100 feet. The zone often produces
volumes of water comparable to those of Zone "B n , and with
nearly the same static head; but the quality is seldom, if
ever, as good. There are very few wells which are definitely
known to be producing from this horizon; but in wells on
which there is information, the water often has a strong
hydrogen sulphide odour. Salt contents where information is
available, are usually higher in this zone than in aones
above. Specifically, there are wells on the north and west
sides of the island which we suspect have penetrated this
formation /-
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