FLOOD FORM
23-18 31 AVENUE

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. Moderate infiltration potential — standard systems such as drywells and French drains are viable. Estimated groundwater depth of about 4' indicates a persistently shallow water table with elevated seepage potential into below-grade spaces. Soil records near this property point to groundwater that may sit close to the surface; 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 TypeMulti-Family Residential, Built 1940

Building Footprint1,180 SF

Roof Runoff 1" Rain736 Gallons

Elevation14'

Groundwater Depth4'

SewershedBB-029

Flood Exposure TypeScore

Sewer BackupLow

StormwaterLow

GroundwaterHigh

CoastalHigh

Infiltration CriteriaValue

Lot Impervious Area1,661 SF

Block Impervious %65%

Soil Infiltration Rate3 IN/HR

Available Area1,964 SF

Infiltration RatingModerate