516
(d)
(e)
(f)
to assume the possibility of such an extremely
dry year as would be obtained, by combining the
rainfall of the wet season of 1995 víz, 35*.60
with that of the dry season of 1890-91 9*.34.
That in dry years suon as 1895-1896, about 56 per
cent of the actual rainfall, may be collected, on
the average of both wet and dry seasons.
Taking the minimum rainfall at 53,80 inakes
of which 56%,or nearly 30 inones may be collected
and made available, during the driest year that
need be anticipated.
In extremely dry seasons as little as 9.34 inon es
only, may fall from September to April of which
but 40 per omnt or 3.60 inones only, will be
polleated and made available,
Such an unusual season as Sept. to April 1990-91
will not in all human probability, be preceded by
such a season as May-August 1895, but rather by
one more nearly resembling that which actually
ooourred. At least it will be safe to assume
that the available rainfall during the 4 dry
months, will be sufficient to bring up the
average for the whole year, to that assumed for
the driest years namely 30 inones. The distrain-
tion will be for such a year
for the wet, season 26.4 inahes
for the dry
3.6
30.0
(8) The minimam supply that any given area
afford may be thus computed, say for 1,000 mores,
Gallons
30" x 1000: * 22635
>
millions of Gallons
679.05 per annum.
56.59
per mensum
1.86 per diem:
The storage-incommodation required to develop this
amount during the most prolonged period of dry weather,
may be osigulated, according to the principle laid down
in the paragraph 7 sention (f)
For the wet season
inch acres
millions
26.4 x 1000 x 22,635 =
Deduot 4 months supply
597.56
at 56.59
226,36
Remains Storage
During the dry months
371.20
Supply from gathering ground
#1.49
371.20
452.69
= 3.6 x 1000 x 22,635
Drawn from Stook
8 Months at 56.59
=
The storage expressed in average daily supply amounts to
371.20 = 200 days supply nearly.
This assumes that the demand is constant during
the whole year. It will, in all probability, be greater
during the dry season than during the wet.
If the amount of storage required to equalise
the flow of the antusi year 95-96 be computeri, it will,
+
on account of the greater dry weather flow, be found to
be little more than one half this amount. Storage at
the rate of 200 days supply will probably provide for
variations in demand.
To compute the probable present minimum supply
according to these data
9
SUPPLY AFFORDED BY A GIVEN AREA.