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LAYOUT OF PERFORATED PIPE LATERALS FOR <br />PRESSURE DISTRIBUTION IN MOUND <br />PERFORATED PLASTIC PIPE, . <br />PERFORATIONS SPACED 30" OR 36" <br />END ON CENTER PERFORATION <br />VIEW SIZE MAY BE <br />OR .16. <br />PERFORATIONS ON BOTTOM OF <br />rIM <br />_ -sue--- <br />_ SPACINU <br />- MANIFOLD -- <br />PIPE <br />"6 P 1 PE FROM <br />PUMPING CHAMBER <br />FM <br />