They proposed the establishment of the dam crack opening degree statistic model and analysis method, the time series analysis method of horizontal displacement of dam crest, and the multiple-arch dam
displacement deterministic model's theory and method.
Extra rigidity is possible if the buttresses can be linked together, as in the multiple-arch dam
, but such a structure, is only possible where no movement is anticipated in the buttress foundations.
This reinforced-concrete multiple-arch dam was built by the Littlerock Creek and Palmdale Irrigation Districts in 1922-1924 and--in stark contrast to the privilege afforded the city of Los Angeles--the farmers in these districts could not build their dam until obtaining explicit approval from the State Engineer.
While gravity-dam design may have escaped stagnation, the new law proved enormously burdensome to hoped-for advances in multiple-arch dam technology and, in California, did much to eliminate the technology from the realm of acceptable design.