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From page 63... ... 63 Table A.1 through Table A.6 provide mitigation ratios for forest restoration, uplands restoration, and wetland restoration out-of-kind mitigation. The mitigation ratio indicates the area of mitigation needed per unit area of new impervious highway impact given a range of highway impact sizes from 2% of the subbasin to 20% of the subbasin. Read the entire page →
From page 64... ... 64 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide Mitigation type 100year peak flow 50year peak flow 25year peak flow 10year peak flow 2year peak flow 100year event volume 50-year event volume 25-year event volume 10-year event volume 2-year event volume Forest restoration 2.0 1.9 1.8 1.6 1.3 1.6 1.9 2.6 4.0 N/A Uplands (Grassland) restoration 2.0 1.9 1.8 1.6 1.3 10.3 5.7 3.1 2.1 1.5 Wetland restoration 2.0 1.9 1.8 1.6 1.3 4.0 2.1 1.6 N/A N/A N/A: not available as no consistent pattern was detected. Read the entire page →
From page 65... ... Mitigation Tables 65 Mitigation type 100year peak flow 50year peak flow 25year peak flow 10year peak flow 2year peak flow 100year event volume 50-year event volume 25-year event volume 10-year event volume 2-year event volume Forest restoration 4.3 5.6 7.3 N/A N/A 1.3 1.5 1.9 2.4 7.0 Uplands (Grassland) restoration NE NE NE NE NE NE NE NE NE NE Wetland restoration 3.4 4.5 6.0 8.8 N/A 2.4 2.8 3.4 4.1 9.0 N/A: not available as no consistent pattern was detected. Read the entire page →
From page 66... ... 66 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide AP location Mitigation location 2-year through 100-year peak flow 100year event volume 50-year event volume 25-year event volume 10-year event volume 2-year event volume At transportation project Upstream 45 410 320 50 N/A N/A Downstream Downstream 230 30 30 25 10 N/A Downstream Upstream 60 60 55 50 20 N/A N/A: not available as no consistent pattern was detected. Table A.7. Read the entire page →

From page 63...

... 63 Table A.1 through Table A.6 provide mitigation ratios for forest restoration, uplands restoration, and wetland restoration out-of-kind mitigation. The mitigation ratio indicates the area of mitigation needed per unit area of new impervious highway impact given a range of highway impact sizes from 2% of the subbasin to 20% of the subbasin.

Read the entire page →

From page 64...

... 64 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide Mitigation type 100year peak flow 50year peak flow 25year peak flow 10year peak flow 2year peak flow 100year event volume 50-year event volume 25-year event volume 10-year event volume 2-year event volume Forest restoration 2.0 1.9 1.8 1.6 1.3 1.6 1.9 2.6 4.0 N/A Uplands (Grassland) restoration 2.0 1.9 1.8 1.6 1.3 10.3 5.7 3.1 2.1 1.5 Wetland restoration 2.0 1.9 1.8 1.6 1.3 4.0 2.1 1.6 N/A N/A N/A: not available as no consistent pattern was detected.

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From page 65...

... Mitigation Tables 65 Mitigation type 100year peak flow 50year peak flow 25year peak flow 10year peak flow 2year peak flow 100year event volume 50-year event volume 25-year event volume 10-year event volume 2-year event volume Forest restoration 4.3 5.6 7.3 N/A N/A 1.3 1.5 1.9 2.4 7.0 Uplands (Grassland) restoration NE NE NE NE NE NE NE NE NE NE Wetland restoration 3.4 4.5 6.0 8.8 N/A 2.4 2.8 3.4 4.1 9.0 N/A: not available as no consistent pattern was detected.

Read the entire page →

From page 66...

... 66 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide AP location Mitigation location 2-year through 100-year peak flow 100year event volume 50-year event volume 25-year event volume 10-year event volume 2-year event volume At transportation project Upstream 45 410 320 50 N/A N/A Downstream Downstream 230 30 30 25 10 N/A Downstream Upstream 60 60 55 50 20 N/A N/A: not available as no consistent pattern was detected. Table A.7.

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