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~ :: <br />10.2 cm <br />(4") MAX. DIA. <br />J HOLE <br />RISER (MAXIMUM SEDIMENT <br />~ 1 STORAGE LEVEL <br />FLOW <br />~- <br />SEDIMENT CLEANOUT <br />LEVEL <br />(60% o} maximum setllment <br />storage level) <br />Single Perforation <br />(Cross Section) <br />i- <br />JPEN TOP <br />ND BOTTOP <br />'ACK WELI <br />10.2 cm <br />-~") DIA. HOL <br />20.3 cm <br />9") DIA. PIP <br />CUT IN HAL <br />LENGTHWIS <br />i <br />MAXIMUM <br />SEDIMENT <br />STORAGE <br />LEVEL <br />7.6 cm <br />(3,. ) <br />Single Perforation With Skimmer <br />(Elevation) <br />Ftgure 36. Single perforation of riser barrel." <br />~~ <br />