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i� <br /> 2. Application rates in the range ofOtto 0.37 m3/hr-m are suitable <br /> for treatment of screened raw wastewater and primary effluent. <br /> Maximum rates should be used to determine required slope length. <br /> Intermediate rates should be used to compute area requirements. <br /> i <br /> 3. Application periods of 8 to 12 hr/day should be used for design. <br /> Application periods up to 16 hr/day may be used in practice without <br /> effecting process performance. <br /> 4. Continuous application may be used for short periods (1 week or <br /> less) without affecting process performance. Significant reduction <br /> I <br /> in BOD and nitrogen removal efficiency can be expected with <br /> I, prolonged continuous application. <br /> 5. Temperature is not a design consideration for BOD and TSS removal <br /> for average wastewater temperatures on the slope between 10 and <br /> 6 280C. <br /> i 6. Slope grade is not a critical design parameter in the range of 2 to <br /> I� 6 percent. <br /> 7. Raw wastewater must be screened prior to overland flow distribution. <br /> i� A screen size of 1.5 mm is recommended. <br /> 8. Double gated pipe should not be used for distribution 'unless a positive <br /> means is provided to separate the flow from each side of the pipe. <br /> 9. Cross-slopes should be avoided unless the width of slope is much <br />' greater than the down-slope distance. <br /> 10. Lined ditches or buried drain pipe are recommended for runoff <br /> collection on large systems. <br /> -66- <br /> I ' <br />