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2. Select maximum value of application rate (q) in valid range of the <br /> model. <br /> Select q = 0.37 m3/hr•m <br /> 3. Determine required value of slope length (z) using Figure 4-3. <br /> Vz = 41.5 m <br /> - 4. Select application period (P). <br /> P = 8 hrs/day <br /> 5. Compute q for area calculation. <br /> 0.37 m3/hr •M <br /> g q = 1 .5 —4— .._ P,63 SAFr= Y FPr.-rO!L <br /> f <br /> q = 0.25 m3/hr-m <br /> 6. Compute required total area. Assume 7 day/wk application frequency. <br /> Area = (glP) <br /> P <br /> Area = (3,000 m3/day) (41.5 m) <br /> R (0.25 m3/hr-m) (8 hr/day) <br /> i Area = 62,250 m2 = 6.2 ha <br /> The required area of 6.2 ha is considerably less than would be calculated <br /> using existing design criteria. Using 3 cm/day as a typical hydraulic loading <br /> rate currently used for design, an area of 10 ha would be calculated. The <br /> implication is that current design criteria may be quite conservative. <br /> DESIGN AND OPERATING GUIDELINES <br /> The following general guidelines for overland flow design and operation <br /> are based on the findings from the Phase II field studies. Additional detailed <br /> information on overland flow design is presented in the EPA Process Design <br /> Manual for Land Treatment of Municipal Wastewater (USEPA 1981) and in Smith <br /> and Schroeder (1982). <br /> 1. Design of overland flow systems should be based on the parameters <br /> - application rate, slope length, and application period. <br /> f <br /> -65- <br />