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10.2 cm <br />(4") MAX. DIA. <br />HOLE <br />RISER MAXIMUM SEDIMENT <br />~ 1 STORAGE LEVEL <br />FLOW <br />SEDIMENT CLEANOUT <br />LEVEL <br />(60% 04 maximum sediment <br />storage level) <br />Single Perforation <br />(Cross Section) <br /> <br />i:~ <br />., <br />JPEN TOP <br />.ND HOTTOT <br />'ACK WELL <br />10.2 cm <br />-~") DIA. HOL <br />20.3 cm <br />9") DIR. 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 />Figure 36. Single perforation of riser barrel.~S <br />~~ <br />