C/A
74
provided that the present rural character of the district
is maintained.
15.
16.
At present there are slow sand filters capable
of dealing with 6°3 M.G.D., and rapid gravity filters with
a capacity of 3'0 M.G.D., and on completion of the Elliot
rapid filters the total capacity will be 13'3 M.G.D.
Allowing for seasonal fluctuations, the total filtering
capacity necessary for the ultimate yield of the Island
resources should be 20% in excess of 15'4 M.G.D.
We should therefore recommend that approval be
given to the proposal for converting the 2 M.G.D. slow sand
filter units at Albany into rapid gravity units with a
capacity of 4 M.G.D. The estimated value of the land render-
ed available for building purposes after the new filters have
been placed in commission would be more than the cost of new
construction.
Services Reservoirs.
17.
C
The total capacity of the various service reservoirs
18 19 85 M.G., which would appear to be reasonable for today's
requirements, but further capacity will undoubtedly be required
as the demand increases. "A usual provision is two days'
storage of the average annual daily supply, but in this case,
owing to the skilful way in which the various sources of
supply are being interlocked, a somewhat smaller storage is
The construction of the Garden Service Reservoir
permissible.