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Table L-1. Mitigation Methods for Tree and Infrastructure Conflict <br />Method Description Benefits Considerations Example Image <br />Pervious <br />Concrete <br />A high-porosity <br />concrete that <br />allows air and <br />water to reach <br />soil and tree <br />roots. <br />May reduce <br />stormwater runoff, <br />encourage deeper <br />root growth, reduce <br />root damage to <br />sidewalks, provide <br />better growing <br />conditions. <br />Requires deeper <br />excavation for <br />installation, <br />requires more <br />maintenance than <br />standard concrete. <br />Cost is a concern. <br />Reinforced <br />or Thicker <br />Slab <br />Concrete <br />reinforced with <br />steel rebar or <br />wire mesh and/ <br />or poured <br />thicker near <br />edges. <br />Helps resist uplift of <br />tree roots, may be <br />used to correct uplift <br />after other <br />corrective actions <br />have been taken. <br />May not be <br />compatible with <br />future utility <br />installation, should <br />not be used where <br />additional root <br />growth is <br />anticipated. <br />Expensive, worst- <br />case scenario only. <br /> <br />Expansion <br />Joints <br />Separations <br />between two <br />sections of <br />sidewalk at any <br />interval. <br />Allow for some <br />movement of <br />concrete, used to <br />control the location <br />of sidewalk cracking. <br />Not recommended <br />for areas where <br />significant <br />additional root <br />growth is <br />anticipated, short- <br />term solution. Wide <br />joints can serve as <br />tripping hazard. <br /> <br />Tree Pits/ <br />Expanded <br />Tree Pits <br />Cutout in the <br />sidewalk in <br />which a tree is <br />planted. <br />Provides space for <br />new plantings where <br />previously not <br />possible. <br />Must establish <br />minimum sizing <br />requirements to <br />ensure adequate <br />soil volume, <br />difficult to <br />implement in <br />private easement <br />areas. <br />