Sewershed BB-009 · NYC DEP Combined Sewer Overflow Tributary Area
BB-009 - Sunnyside, Queens
Properties in this area share the BB-009 combined sewer — during moderate-to-heavy rain, runoff can exceed pipe capacity faster than it drains, which is what drives sewer backup exposure block by block. Here’s what that looks like for Sunnyside, Queens specifically.
BB-009 is a combined sewer area covering 1,749 properties in Sunnyside, Queens. Flood Form rates 46% of them Moderate or High for stormwater exposure, and 11% for groundwater. 76% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 73 ft. The median building dates to 1931. 30% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to Newtown Creek. NYC DEP has built 113 green infrastructure assets here.
1,749
Properties in sewershed
75.9%
Legally eligible for on-site infiltration
46%
Stormwater exposure: Moderate or High
11%
Groundwater exposure: Moderate or High
What sets BB-009 apart
73 ft
Median ground elevation
91%
Average impervious cover per lot
1931
Median year built
30%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Sunnyside properties
Downspout Diversion
Redirects roof runoff away from the combined sewer and into landscaped or permeable areas on the lot.
Infiltration System
Drywells or infiltration chambers that let stormwater soak into the ground on-site instead of entering the sewer.
Detention System
Holds stormwater temporarily and releases it slowly, reducing peak flow into the combined sewer during a storm.
Drain Improvement
Upgrades yard, area, or foundation drains so water is carried away from the building instead of pooling.
Foundation Waterproofing
Protects the foundation from groundwater intrusion, relevant where groundwater exposure runs high.
Nearby sewersheds
- BB-026Sunnyside628 properties · 63% with Moderate or High stormwater exposure
- NCQ-029Sunnyside216 properties · 21% with Moderate or High stormwater exposure
- BB-028Woodside5,778 properties · 37% with Moderate or High stormwater exposure
- BB-024Queensbridge459 properties · 67% with Moderate or High stormwater exposure
- BB-023Long Island City282 properties · 73% with Moderate or High stormwater exposure
- NCB-027Greenpoint920 properties · 57% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form