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Yield.
3.
Deductions.
4
are shewn on Sheet No. 2.
It will be noticed that the years 1895 to
1898 cover a period of low rainfall the years 1595 to 1998 and 1898 to 1997 being very dry years and this period has been select-
-ed for investigation.
There is not sufficient data yet avaliable
to calculate the yield from the catchment area by direct measure-
sents but a fair approximation can be made from the rainfall statistics. The catchment area being large and varied in
character a fair assumption to take is as follows:-
Months
konths
Months
-
Direct Catchment Area.
May to September inclusive 60% of the rainfall avaliable for Storage in reservoir.
Üctober to April inclusive 23% of the rainfall avail- -able for Storage in keservoir.
Catchment Area already intercepted by a Catchwater. May to September inclusive 20% of the rainfall avail- -able for Storage in Reservoir.
have been prepared.
Ün these assumptions Tables Nos. 1, 2 and 3
Tabie No. 1 gives the yield from the Direct
Catchment for the years 1995 to 1998.
Table No. 2 gives the yield from the Intercep-
ted Catchment for the years 1895 to 1998.
Table No. 3 combines tables Nos. 1 and 2 and
gives the total yield from both Catchment Areas.
Table No. 3 is shewn plotted as a curve On
Sheet No. 3 and from this curve the relation between yield,
supply and storage can be easily got.
1.
Deductions.
That a supply averaging 5 #ilion gallons a
day for the months of Uctober to April inclusive is all that
can