FLOOD FORM
21-34 23 STREET

Queens, 11102

Resilience
Grade

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Property Summary

Moderate Compound Flood Exposure index. Stormwater flooding is the primary exposure factor for this property. Low infiltration potential — conveyance and management strategies may be more appropriate. Soil borings about 190' away found no groundwater to a depth of 37' in 2024. Soil records near this property point to deep fill soil; a percolation test is recommended before any infiltration work. 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 TypeMixed Use, Built 1950

Building Footprint990 SF

Roof Runoff 1" Rain617 Gallons

Elevation21'

Groundwater Depth37'

SewershedBB-029

Flood Exposure TypeScore

Sewer BackupLow

StormwaterModerate

GroundwaterMinimal

CoastalMinimal

Infiltration CriteriaValue

Lot Impervious Area1,763 SF

Block Impervious %81%

Soil Infiltration Rate3 IN/HR

Available Area1,003 SF

Infiltration RatingLow