Sewershed BB-034 · NYC DEP Combined Sewer Overflow Tributary Area
BB-034 - Ditmars, Queens
Properties in this area share the BB-034 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 Ditmars, Queens specifically.
BB-034 is a combined sewer area covering 5,122 properties in Ditmars, Queens. Flood Form rates 39% of them Moderate or High for stormwater exposure, and 6% for groundwater. 79% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 49 ft. The median building dates to 1930. 9% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to East River / Open Waters. NYC DEP has built 1 green infrastructure asset here.
5,122
Properties in sewershed
79%
Legally eligible for on-site infiltration
39%
Stormwater exposure: Moderate or High
6%
Groundwater exposure: Moderate or High
What sets BB-034 apart
49 ft
Median ground elevation
90%
Average impervious cover per lot
1930
Median year built
9%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Ditmars 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-031Astoria555 properties · 45% with Moderate or High stormwater exposure
- BB-036Ditmars277 properties · 10% with Moderate or High stormwater exposure
- BB-041Steinway1,644 properties · 29% with Moderate or High stormwater exposure
- BB-035Ditmars116 properties · 36% with Moderate or High stormwater exposure
- BB-032Hallets Point180 properties · 8% with Moderate or High stormwater exposure
- BB-030Hallets Point235 properties · 60% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form