CO129-302 - Public Offices - 1900 — Page 231

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tration, Ser-

reservoirs, Distributary system.

224

(6) The proposed arrangement of the outlet culvert and valve well does not entirely commend itself to my judgment. It would be more in accordance with modern practice to remove it from beneath the bank, constructing it as a tunnel, In determining åta section, provision should be made for carrying off the perennial flow of the streams, and even of considerable floods, during construc- tion. It will scarcely be possible to complete the dam

If it be not carried up to the during one dry season. full height before the first monsoon so that the permanent bywash can come into play, then during the monsoon the incomplete dam may be overtopped, and if earth be the constructive material, considerable damage will result. One of the advantages of concrete is that if an incom- plete dam is overtopped, no serious damage ensues. If a masonry dam is adopted, the arrangement at Tytam

may be followed.

(7)

The size of overflow should be proportioned to the area of gathering ground in the ratio which ob- tains at Tytam. This sufficed to carry off the extra- ordinary flood of 1889, one that is not likely to be exceeded. According to the figures given in the report, the area of overflow will probably suffice.

(8)

The proposed arrangement of filter beds and service reservoirs, is as far as can be seen from the plans, thoroughly sound; also the proposed distribu-

tary-system.

Madonment of bld works.

(9)

The existing works will doubtless be aban- doned ultimately, if for no other reason, because the

Mr gathering ground will be wanted for occupation. Gibbs in his report lays stress upon the saving that