The excavation was begun at the end of May, 1907, and completed in January, 1908, by Scott and Lee, the contractors. The embankments were then allowed to stand until the beginning of July, 1908, to permit the whole to become thoroughly settled and consolidated prior to beginning the lining. In July the work of trimming the embankments and excavating for the foundations of the reservoir columns was commenced, under the Company's own administration, which completed the entire work.

Plate VI.—Details Of Beams And Columns For South Reservoir.
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Plate VIII, Fig. 1.—Details Of Forms For South Reservoir.
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Plate VIII, Fig. 2.—View of Western Half of South Reservoir, Showing Final Setting Up of Derrick on Central Columns.

Concrete Lining and Roof.—The general arrangement and details of the side-walls, columns, and roof are shown on Plates VI, VII, VIII and [IX]. The principal feature consists in dividing the reservoir into radial sections and supporting the roof on 135 primary and 670 secondary beams, from 135 columns, spaced as follows: