364 PARKS 



11. Flat treads for all ladders. Advantage: Reduces to minimum 

 danger of slipping. 



12. Four springboards, two three feet from surface of water (edge of 

 scum gutter) and two 10 feet, and diving tower with platform 16 feet from 

 water, meeting as far as possible all requirements of N. C. A., A. A. C., 

 and N. A. A. F., centralized at deep area extending 50 feet at one side of 

 pool midway of length. (See Plate 157 for location.) Advantages: Pro- 

 vides regulation equipment for all swimming meets. Concentration of 

 springboards at one point in a large pool is an advantage from the point 

 of view of supervision and safety. This arrangement also minimizes the 

 danger of divers striking swimmers, the latter being free from this form of 

 interference except at this one location. This concentration, however, must 

 not approach the point of congestion. The proper location of ladders is 

 important in avoiding this danger. 



13. Diving tower 8x12 feet with platform 9 feet from water, provid- 

 ing station for life guard as well as base for two springboards (10 feet high), 

 and second platform 6x8 feet, 16 feet from water, waterproofed. Advan- 

 tages: Places life guard in most advantageous position to observe deep 

 area of pool as well as to supervise diving. Second platform affords some 

 protection from sun. 



14. Bronze chain supported by wooden floats suspended across pool 

 50 feet from each end at depth of four and one-half feet. Advantages: 

 Chain is superior to rope, which very soon becomes slimy and rots, Bronz-e 

 chain is recommended for the purpose of permanency, but galvanized chain 

 is quoted in the estimates submitted herewith. 



15. Thirty-inch concrete drain and 1 2-inch supply. Local conditions 

 must be considered in deciding on size of drain and supply pipes. Former 

 should take available sewer connections into consideration, and latter is 

 dependent on available water pressure and size of supply main. Advantages : 

 If local conditions allow drain and supply pipes of sizes indicated, this makes 

 possible emptying the pool in three and one-half hours and refilling in an 

 equal length of time, with supply at 30 pounds pressure. Allowing five 

 hours for cleaning pool, water can thus be changed in 12 hours. 



1 6. Intake distributed at four points at one end of pool. Advantages: 

 High pressure of large main is thus reduced before entering pool, mini- 

 mizing erosion. If purity of water is maintained by continuous flow method, 

 stirring up of sediment on bottom is reduced to minimum. 



17. Concrete runway 10 feet wide entirely around pool sloping away 

 from the edge at pitch of three-fourths inch in one foot. Advantages : Wide 

 concrete runway reduces dirt and other impurities carried into pool. Slope 

 prevents water from draining back into pool, especially when cleaning 

 runway. This slope obviates necessity of raised edge around pool. 



