FLOOD FORM
21-31 31 ROAD

Queens, 11106

Resilience
Grade

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Property Summary

High Compound Flood Exposure index. Groundwater flooding is the primary exposure factor for this property. Low infiltration potential — conveyance and management strategies may be more appropriate. Estimated groundwater depth of about 1' indicates a persistently shallow water table with elevated seepage potential into below-grade spaces. Property drains to the BB-029 combined sewer outfall. Site overlaps a buried historic stream — groundwater levels may rise rapidly during rain events independent of the resting water table depth; subsurface investigation is recommended before any infiltration work.

Property TypeTwo Family Residential, Built 1940

Building Footprint609 SF

Roof Runoff 1" Rain380 Gallons

Elevation10'

Groundwater Depth1'

SewershedBB-029

Flood Exposure TypeScore

Sewer BackupMinimal

StormwaterModerate

GroundwaterHigh

CoastalHigh

Infiltration CriteriaValue

Lot Impervious Area1,120 SF

Block Impervious %91%

Soil Infiltration Rate3 IN/HR

Available Area961 SF

Infiltration RatingLow