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REFERENCES 757 11-7. If the flow to a lateral is 5.0 gal/min and the lateral contains 26 orifices spaced 3 ft apart on center,determine the minimum theoretical size for the lateral so that the discharge from the first and last orifices will not vary by more than 5 percent, 10 percent, or 15 percent (to be selected by the instructor). What practical lateral size would you recommend and what will be the corresponding difference(percent)between the flow through the first and last orifices? 11-8. Lay out and size an intermittent sand filter and distribution system for a four-bedroom .house.Assume that the following conditions apply: r ,. Item Unit A 8 C Average occupancy persons/d 3.0 4.0 6.0 F Size of septic tank gal 1200 1500 2D00 Loading rate gal/ft2-d 0.75 1.5 1.25 Dosing rate times/d 12: 16 18 Orifice size in ' ' , Orifice discharge head ft 8 s 10 a 5 a 11-9. Using data given in Example 11-5,estimate the pump discharge using the unrestricted pump curve given in Fig.6-9:Assume the elevation difference between the septic tank and the filter is 60 ft and the length of pipe required from the septic tank to the filter I is 90 ft. 11-10. Size and prepare a layout sketch of a recirculating sand filter for a community with a population of 1000 persons_ Use a flowrate of 60 gallcapita d.Assume the hydraulic application rate,based on forward flow, is 5.0 gallft2-d(200 Llm2-d). ' 11-11. Prepare a one-page abstract of the article by J.L.Darby,G.Tchobanoglous,M.A.Nor, i and D. Maciolek (1996), Shallow Intermittent Sand Filtration: Performance Evalua- tion,Small Flows Journal, Vol. 2, Issue 1. 11-12. Prepare a one-page abstract of the article by R.W.Emerick,R.Test,G.Tchobanoglous, and J..L. Darby (1997), Shallow Intermittent Sand.Filtration:.Microorganism Re- moval,Small FIows Journal, Vol. 3,Issue I. i. 11-13. Anintermittent sand filter is dosed either once,4 times, 12 times,or 24 times per day. Prepare a table and.indicate what effect these dosing frequencies will have on BOD, i TSS,NH3,total N, total P.bacteria,and virus removal. 11-14. Prepare a one-page abstract of the article by M.Hines and R.E.Farveau(1974),Re- circulating Sand Filters:An Alternative to Traditional Sewage Absorption Systems,in r Proceedings ASAE National Symposium of Home Sewage Disposal, Chicago,ASAE Publication Proc-175,pp. 130-137,American Society of Agricultural Engineers, St. j I Joseph,MI. REFERENCES k r I Anderson,D.L., R.L. Siegrist, and R:J. Otis (1986) Technology Assessment'of Intermit I tent Sand Filters, Municipal Environmental Research Laboratory. U.S. Environmental E Protection Agency, Cincinnati, OH. 'I