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No.21-Conveyance Storm Pipes <br /> Drainage System Potential Conditions When Maintenance Is Results Expected When Maintenance <br /> Feature Defect Needed Is Performed Or Not Needed <br /> General Obstructions, Root enters or deforms pipe,reducing Use mechanical methods to remove root <br /> Including Roots flow. if possible.Use of chemicals to remove <br /> roots shall be done in accordance with <br /> applicable regulations. If necessary, <br /> remove the vegetation over the line. <br /> Pipe Dented or Inlet/outlet piping damaged or broken Pipe repaired and/or replaced. <br /> Broken and in need of repair. <br /> Pipe Rusted or Any part of the piping that is crushed Pipe repaired and/or replaced. <br /> Deteriorated or deformed more than 20%or any <br /> other failure to the piping. <br /> Sediment& Sediment depth is greater than 20%of Install upstream debris traps(where <br /> Debris pipe diameter. applicable)then clean pipe and remove <br /> material. <br /> Debris barrier or A debris barrier or trash rack that had Debris barrier or trash rack is replaced. <br /> Trash Rack been installed on the end of a drainage <br /> Missing pipe is missing <br /> Joint/Seal The joint between pipe sections is The joint and/or seal is repaired so that <br /> Problems separated and/or the seal at the joint is joint is not separated and is properly <br /> cracked or broken. sealed. <br /> January 2016 Snohomish County Drainage Manual Volume V-Runoff Treatment BMPs 50 <br />