The salt water distribution system consisted primarily of a net- work of 6 feasible, mum flows buildings inch and 4 inch transite pipes buried underground. Where the system was designed as a "looped" system to provide maxiwith a minimum loss of pressure head, Isolated areas and scattered along the shore line or located at the extremities of the island were served with a single pipe supply line with requisite branches serving the individual facilities. Later changes in location of structures and additional facilities did not seriously affect the main distribution system but simply required extensions to it or relocation of service connections. Atamic weapons test operations required that there be made available at the drone plane parking area at the airfield on Eniwetok a supply of both salt and fresh water at a rate of 125 gpm under 50 psi pressure for washdown of drone planes. A small booster pump station, housing one 125 gpm salt water and one 125 gpm fresh water pump, was designed to provide this service. It was located at the southerly end of the island, near the cargo plier, and was arranged to take suction from the distribution line of the main system for supply and to discharge into the same line under added pressure. The station was manually operated. Check valves installed in both salt and fresh water lines between suction take-offs and points of discharge permitted the lines to function under the added pressures exerted by the pumps. The salt water elevated storage tank was procured from Navy sur- plus stocks at Pearl Harbor and designed capacity was predicated upon sizes available. The tank for Eniwetok consisted of a two ring tank and had a rated capacity of 1000 barrels (42,000 gallons). The tower structure was located in the heart of the housing area near the north end of the island. It was 50 feet high. Because the ground contour of the island was essentially level, the height of the tower plus the additional head established by the minimum operating level of the water in the tank surmounting the tower provided approximately 25 psi static pressure upon the system. This pressure was considered the minimum for proper operation of the system. Maintaining the system at minimum pressure tended to eliminate waste, leakage, and excessive usage, Distillation equipment finally designed and procured for the Eniwetok fresh water system canprised eight 600 gph units. The total daily rated capacity of these units was 115,200 gallons per day. The design population criteria was 756 persons housed in quarters and 1080 housed in tents for a total of 1836 persons, Estimated requirements for this population of 1836 men was 75,600 gallons per day. The difference between full rated capacity of 115,200 gallons per day and estimated consumption of 75,600 gallons per day was conceived as a tolerance or flexibility factor providing for one or more units for standby service, reduced number of hours of the operation schedule, and for shut-down periods of units requiring necessary periodic or emergency maintenance. 5-189