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Chemically it is always inferior to the others. Better conservation may be expected
to do much, and should entirely do away with the fluctuating results got with the
water from the other sources.
Madura .—The conditions in 1910 resembled those in 1908 rather than those in
1909. The quality of the river water varied correspondingly, being much better
in 1909 than in either of the two other years. This would appear to point to
inefficient conservation of the bed of the river. A very small flow being capable of
carrying pollution into the water-supply. Passage through the Infiltration Gallery
always produced improvement, marked in 1908, but it was only in 1909 that
the water as distributed was equal in quality to that at the head works. More
consistent effort to keep the pipes clean is probably required.
Dindiqul. —The water from the Infiltration Gallery was much purer in 1910
than in the other two years, but it had to be spoiled by admixture with the inferior
Deep Well water. Usually passage through the pipes brings about some improve
-
ment. Chemically the well water is softer and generally better than the river
water, which is rather against expectation.
Nellore .—At this season owing to floods the river water is considerably pol
-luted. In 1910 only was there decided improvement as a result of passage through
the Infiltration Gallery, but on this occasion the improvement was of selective
character not easy to understand as resulting from filtration The very high total
counts in the water from the Gallery seem to indicate considerable admixture with a
subsoil water containing many fewer fœcal germs but many more of the other kinds.
Admixture of some kind is a constant indication from the chemical results.
Tirupati.—There does not seem to be a rule according to which the results got
at Tirupati can be interpreted. Usually the river water is pretty bad, is not improved
by passage through the Infiltration Gallery and is further polluted by passage through
the pipes. In 1910 all these conditions were reversed except the last, and perhaps,
owing to the greater purity of the water to begin with, the net result was not so bad
as it had been in previous years.
Kurnool. —The Cuddapah-Kurnool Canal is usually in flood at this season of
the year, and its water is correspondingly polluted. On the whole the results got
from the settling tanks are good, but there are indications that the tanks are not
used to such good purpose as they might be. Filtration as carried out in Kurnool
does not improve the water. It is satisfactory to note that the deterioration of the
water from silt in the pipes, noticed in 1908, was not evident in 1909 or in 1910.
Conjeeveram.— There has been a well sustained improvement in the quality of
the Head Works water for the past two years at this season as compared to 1908.
In. 1910 this improvement was extended to the matter of total count in the distributed
water which showed up very badly in this respect in 1909. It would be very
satisfactory if this state of affairs can be maintained.
Gudiyáttam.— Owing to a change in the order of taking samples no comparison
is perhaps justifiable as between 1910 and the two previous years. In 1908 we
find just the opposite state of affairs to 1910. A medium water at head-quarters is
distributed as a good water in 1908, in 1910 a good water at head-quarters is spoiled
by distribution. This cannot be regarded as progress in the right direction. In
1909 the water was much the same on collection and distribution, so that the
general tendency has been towards improvement at the head works and deterioration
as a result of passage through the pipes.
Vellore . — Seasonal change is perhaps accountable for the difference of the
water in 1910, but the change is in the right direction. There seems to be some
-
thing wrong with the way the filtration is carried out, as the total counts are not
sufficiently reduced and are sometimes even increased. Passage through the pipes
improved the water in 1910, but not in the previous years.
Cocanada .—In this quarter the Samalkota Canal is usually flooded and its
water shows the presence of more or less objectionable pollution in considerable
quantity. The results got from the water of the settling tank are always much
better and would be better still if longer settling could be managed. At this
season filtration has always made the settled water worse, multiplying the fœcal