CO129-328 - Governor Nathan - 1905 [1-6] — Page 330

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325

2,292 acres made up as follows:-

Tytam Dan...

Tytam #. Catchwater...

...690 acres.

Mt. Farker Catchwater (part of). Direct Catchment................

210

.110 .1.282

2,292 acres.

*

Though statistics show that a maximum rainfall of

3 inches per hour has occurred here, it may safely be assumed

that on so large a catchment area rain water will not run off at a greater rate than 11⁄2 inches per hour and this will amount on

2,292 acres to 75,638,000 gallons per hour 3,381 cube feet per

second.

Tunnel, &c..

Additional

supply during construction of dam.

In order to deal with this volume of water 1

suggest a tunnel of the approximate size and shape shewn on

Drawing No. 2.

By means of intercepting channels and temporary

dams at AB and CD the whole of the rain (except that portion

failing on the estuary) from the catchment area can be diverted

into the tunnel and carried away clear of the dan site.

The area of the estuary is small and the rain

falling on it can be easily dealt with.

This tunnel can be subsequently used to take the

draw-off pipes from the reservoir, a valve tower being construct-

-ed at the inlet end,

This arrangement will have the advantage that

only fresh water will be drawn off as the heavier sait impregnat-

-ed water if any will remain near the upstrear face of the dan

where the reservoir is deepest.

The water off the catchment area intercepted by

the dam at CD can be utilized as an additional supply to the

pumps during the construction of this reservoir; all that is

required is a short length of iron pipe to join up to the suction

main now being 1813.

The dam at AE intercepts, of course,

a far

larger

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