SALT WELL WATER SYSTEM AT HONOLULU LABORATORY 



171 



were required. Also, strands of a diatom 

 {Melosira sp.) which broke off from the 

 sides of the pool caused the water to be- 

 come turbid. Second, the wind over the 

 pool could also be reduced or eliminated. 



Wind ripples pre^'ented clear observations 

 through the water surface of the outdoor 

 pool. 



In August 1961 a new system was set 

 into operation (fig. 2). The well is 73 



Figure 2. — Present salt-water system. The pumps and well are housed in the building at the right. 

 The aerator, in the center, is resting atop the concrete sump. The fish pool is housed in the 

 quonset hut on the left. 



feet deep, cased with a 12-inch asbestos- 

 cement pipe down to 42 feet. The depth 

 of the well was determined by the depth 

 at which 1,000 gallons of water per minute 

 could be provided. The depth of the cas- 

 ing was determined by the depth at which 

 hard coral rock was reached. Water is 

 presently being pumped at 82 gallons per 

 minute, but the well is capable of provid- 

 ing water at 1,000 gallons per minute with 

 a drawdown of 6 inches. A centrifugal 



pump with a cast-iron housing and a steel 

 impeller is being used because this type of 

 pump happened to be readily available. 

 Thus far, its performance has been satis- 

 factory. 



The aerator is 6 feet wide, 7 feet 9 inches 

 long, and 10 feet high at its apex. All four 

 sides have louvers. The two ends are 

 hinged so that they may be opened for 

 cleaning. It houses 16 aeration trays 

 spaced 6 inches apart. The trays are made 



712-029 O - 64 - 12 



