21-20 30th Avenue, Queens, NY 11102 Flood Risk | Flood Form
FLOOD FORM 21-20 30 AVENUE
Queens, 11102
D
Resilience Grade
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Property Summary
Moderate Compound Flood Exposure index.Stormwater flooding is the primary exposure factor for this property.Moderate infiltration potential — standard systems such as drywells and French drains are viable. 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 1970
Building Footprint1,197 SF
Roof Runoff 1" Rain746 Gallons
Elevation19'
Groundwater Depth23'
SewershedBB-029
Flood Exposure TypeScore
Sewer BackupLow
StormwaterModerate
GroundwaterLow
CoastalMinimal
Infiltration CriteriaValue
Lot Impervious Area4,562 SF
Block Impervious %81%
Soil Infiltration Rate3 IN/HR
Available Area2,505 SF
Infiltration RatingModerate
Flood Exposure TypeScore
Infiltration CriteriaValue
Sewer BackupLow
Lot Impervious Area4,562 SF
StormwaterModerate
Block Impervious %81%
GroundwaterLow
Soil Infiltration Rate3 IN/HR
CoastalMinimal
Available Area2,505 SF
Infiltration RatingModerate
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