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World Environmental and Water Resources Congress 2017 390

Deputy District Attorney Dennison asked him “Do you understand that Mr. Mulholland and you
designed the Hollywood Dam? Bayley answered “Well, in effect, yes. Mr. Mulholland, the
detail, and myself the stress diagrams.” Sample design calculations were reproduced in the few
available textbooks of the era, and Bayley stated that he had used Morrison & Brodie’s Design of
Masonry Dams. An example “stress diagram” from Morrison & Brodie’s 1916 text is presented
in Fig. 8.
After the jurors had completed their inquiries of W.W. Hurlbut, the examination was
passed onto Deputy District Attorney A.J. Dennison. He asked Hurlbut about the blueprints
brought to the Inquiry, specifically, if they were “for the St. Francis Dam?” He replied that these
are the “original drawings” used in the construction of the dam, but that their supporting
computations were in the files at their office.
Dennison got Hurlbut to admit that St. Francis Dam not “designed” per se, but
constructed according to the layout and general dimensions previously developed for the
Hollywood Dam in Weid Canyon. When pressed for the “computations,” Hurlbut answered
“The original records which have been submitted here by various other witnesses who have been
called, and the computation books on the design of the Hollywood Dam on which the basis of the
design of the St. Francis Dam was used.”

Figure 8. Example of the “stress diagrams” described by Edgar Bayley, taken from
Masonry Dam Design, 2 Edition by Morrison & Brodie (1916). This shows a maximum
nd
compressive stress of 20 tons per square foot (tsf) along the ‘Line of Pressure-Reservoir
Full.’ These were the same values used by Bayley in the design of Hollywood Dam, which

were then applied to St. Francis Dam.

World Environmental and Water Resources Congress 2017