Sewershed OH-015 · NYC DEP Combined Sewer Overflow Tributary Area
OH-015 - Bensonhurst, Brooklyn
Properties in this area share the OH-015 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 Bensonhurst, Brooklyn specifically.
OH-015 is a combined sewer area covering 21,675 properties in Bensonhurst, Brooklyn. Flood Form rates 37% of them Moderate or High for stormwater exposure, and 2% for groundwater. 75% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 42 ft. The median building dates to 1925. 1% 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 8 green infrastructure assets here.
21,675
Properties in sewershed
74.9%
Legally eligible for on-site infiltration
37%
Stormwater exposure: Moderate or High
2%
Groundwater exposure: Moderate or High
What sets OH-015 apart
42 ft
Median ground elevation
87%
Average impervious cover per lot
1925
Median year built
1%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Bensonhurst 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
- OH-002Borough Park17,937 properties · 34% with Moderate or High stormwater exposure
- OH-021Gravesend6,804 properties · 44% with Moderate or High stormwater exposure
- OH-017Bay Ridge8,555 properties · 35% with Moderate or High stormwater exposure
- OH-003Sunset Park3,000 properties · 19% with Moderate or High stormwater exposure
- CI-004Flatlands32,638 properties · 46% with Moderate or High stormwater exposure
- OH-018Bay Ridge4,732 properties · 35% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form