ESTIMATED PER CAPITA WATER CONSUMPTION On the basis of experience and engineering judgment, estimates were made of the amounts of water needed each day for each man, It was assumed that personnel quartered in aluminum barracks would use 50 gallons of brackish water and 50 gallons of distilled water per man per day and that those quartered in tents would use 50 gallons of brackish water and 35 gallons of distilled water per day. These as~ sumptions could not be checked because no comparable installations had been erected, ESTIMATED TOTAL RAW WATER SUPPLY ALLOWANCES It requires two gallons of brackish water to produce one gallon of distilled water, one half of the water supplied to the still being lost in the distillation process. Therefore an additional amount of raw water sequal to the amount of distilled water had to be taken into the system to provide for the intake requirements of the stills. In addition, the generation of electric power required a relatively large amount of water (measured by percentage of total water requirements) for cooling purposes. (The details of power generation and cooling for power generation equipment are discussed in Chapter 5.15 of this volume,) Water requirements for cooling varied with the fluctuations of generation of power, A flat allowance of 70 gpm for each generator installed, less one, was made for this requirement. Consequently, raw water intakes and pumping stations were required to handle the total of raw water domestic use, plus two times the distilled water use, plus the electric power generation cooling water, WATERWORKS SYSTEM DESIGN In general, the hydraulic characteristics of the design of all island waterworks systems were similar, The detailed design and ar- rangement of the component parts varied in conformity with the particular requirements for each island, with little if any modification of the functions of these component parts, Each system consisted of the following integrated features: 1. The raw water intake took raw brackish or salt water into the system for distribution as salt water and for conversion to fresh water, 2, The salt water pumping station placed the salt water supply 3. system under pressure by discharging salt water through a pipe or pipe network to elevated storage. The salt water distribution system received the discharge from the salt water pumping station and transferred this water to the elevated storage tank, simultaneously distributing salt water through outlets or service connections to facilities requiring this service. Fire hydrants for operation in conjunction with mobile fire pumper apparatus were 5-186