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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> Maintenance quency a when Main- Action Needed (Pro- <br /> tenance is <br /> Component Routine Main-Neededcedures) <br /> Inspection (Stand <br /> arils) <br /> depth), temporary <br /> erosion control meas• <br /> ures should be put in <br /> place until per- <br /> manent repairs can <br /> be made. <br /> . Properly designed, <br /> constructed and <br /> established facilities <br /> with appropriate flow <br /> velocities should not <br /> have erosion prob- <br /> lems except perhaps <br /> in extreme events. If <br /> erosion problems <br /> persist, the following <br /> should be reas- <br /> sessed: (1)flow <br /> volumes from con- <br /> tributing areas and <br /> bioretention facility <br /> sizing; (2)flow velo- <br /> cities and gradients <br /> within the facility; <br /> and (3)flow dis- <br /> sipation and erosion <br /> protection strategies <br /> at the facility inlet. <br /> Erosion of sides Take actions to eliminate <br /> A causes slope to the hazard and stabilize <br /> become a haz- slopes <br /> and <br /> A, S Settlement Restore to design height <br /> greater than 3 <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 863 <br />