and to establish the lengths of outfall sewers at Parry and Eniwetok at appraximately 450 feet. Similarly, the area of the sleek field for a shot island with a population of 200 would be 3,3 acres, the radius of the field 250 feet and the length of the out- fall sewer should be established at 325 feet". The lengths of the outfall sewers for individual installations tentatively established by the Reconnaissance Report were later adjusted for conformity with the designed systems and are covered in the detailed description of the design of each island system. ENIWETOK ISLAND The Island of Eniwetok is roughly gourd shaped. The protuberance or bulge at the southerly end of the island was entirely occupied by the airfield and its facilities, leaving only the long necklike por- tion to the north for development of living quarters and attendant faci- lities. This area was approximately one mile long and averaged between 500 and 600 feet wide. The elevation of this area varied from 9 to 14 feet above mean low tides, which established the elevation of the datum plane at zero. Maximum high tide occuring bianmally was 5.6 feet above this datum, average high tides being about 3.5 feet in elevation. Be- cause of the limiting conditions of elevation, tides, and proportion of length to width of the area, three central points of collection, at approximately equal distances apart and each comprising the head-point of a subaqueous outfall sewer, were required to serve the area, Mini- mun gradients of .30 percent, equal to .30 feet of slope per 100 lineal feet of pipe, were generally required for the lines that parrelleled the shore line, increased slopes being available in certain instances for lines branching therefrom and serving facilities located on slightly higher ground. At the southerly end of the island, a small system was provided for the detached group of facilities located on the northwesterly side of the airfield, Individual sewer lines discharging directly into the lagoon through 100 feet or less of subaqueous outfall line were provi- ded for each of the three separated and isolated latrines located along the northwesterly side of the airfield as well as for two detached buildings located on the southeasterly side of the airfield. Since the two northerly subaqueous outfall sewers served the concentrated area and were to receive the major population load, each was required to be 750 feet in length for adequate protection against contamination of the tidal lands and inshore waters. The only samd bathing beach on Eniwetok Island was located at the extreme northerly tip, adjacent to the lagoon; this was taken into consideration in the design of the sewer system, and the outfall located nearest thereto was strategically placed (considering distance, wind direction, ocean cur- rents, and tides) to minimize possibilities of pollution of the inshore waters and beach, 5-199