Rock filters have been designed using a number of varying parameters. A summary of the design parameters used for several locations is provided in Table 5.13. The parameters shown for Illinois are the current standards and were not necessarily used to design the systems diagrammed in Figure 5.3. The critical factor in the design of rock filters appears to be the hydraulic loading rate. Rates less than 0.3 m3/m3-d appear to give the best results with rocks in the range of 3 to 8 in. (8 to 20 cm), a depth of 6.6 ft (2 m), and water applied in an upflow pattern.
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