| Popis: |
The perforated lateral pipe and center manifold strainer system for rapid sand filters is one of the older systems in common use. It has certain advantages that commend it to engineers and, when properly designed, has generally given good results in practice. Some experimental work on the hydraulics of such a system, undertaken some years ago, may be of interest to engineers. The experiments carried on in 1920 at Sacramento, California, by H. N. Jenks, Assistant Engineer of the Filtration Division of the City Water Department, were for the purpose of determining the proper relation between the size and spacing of perforations and the size and length of the lateral pipe in this type of underdrain system. The relative cross sectional areas of different sized perforations and of various sized laterals were studied thoroughly and some important deductions made. The conclusions reached by Mr. Jenks in this study were as follows |
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