Rojoa (Aomon Group) and Runit waterworks systems were designed for populations of two hundred persons each. In addition to normal domestic requirements, a gasoline engine driven centrifugal pumping unit with a capacity of 250 gpm at 50 psi discharge head was provided for washedown of the winch cable after weapons test operation. blastproof structure. This pumping equipment was housed in a small The pump took its suction from a shallow dug well cased with 3 foot concrete pipe. The Engebi waterworks system was originally designed to serve a population of 340 persons. In general design, it was similar to the works for Runit and Rojoa, but larger distillation plant capacities were provided because of the larger population design figures. To supply the population, which doubled the anticipated number, four portable stills located adjacent to the mess hall were used. These were removed shortly before test detonations, This island also was provided with cable wash-down pump installation. The Japtan waterworks systems compared generally in scope with those designed for the experiment island camps. Facilities, however, were of a more permanent nature and the buildings covered more area than did those on the experiment islands, even though the population design figures were less. The larger area was due primarily to the detached location of the animal colony development, Since there were to be no blast effect, a separate salt water pump station after the pattern of the designs for Eniwetok and Parry was provided. Original design contemplated provision for 150 persons; this figure was later reduced to 80. Actual peak occupancy of the island was 131 persons. A small pumping station, housing one 100 gpm electric driven centrifugal pump and a 100 gpm gasoline engine driven standby unit was provided for animal run wash-down operations. This station took its suction from the salt water distribution system at a point adjacent to the animal run area and boosted the pressure for wash down service to this area. WATERWORKS OPERATION Actual records of distilled water production for each of the island installations are available for the 39 week period from September 3, 1950, through May 27, 1951. Figure 5.13-1 shows this record of production of distilled water plotted graphically. Due to the constant augmentation of the using population, no simultaneous population and production figures for individual islands are avail- able for comparison, with the possible exception of maximum peak periods. Known populations for these short periods may be compared with known maximum peak production figures for the same periods and thus "spot" per capita consumption figures may be calculated. Calcula- tions have been made by dividing the weekly total of distilled water produced by the days of a week for daily production figures and these daily figures have been divided by the maximum number of persons 5-193