Sewershed RH-028 · NYC DEP Combined Sewer Overflow Tributary Area
RH-028 - Red Hook, Brooklyn
Properties in this area share the RH-028 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 Red Hook, Brooklyn specifically.
RH-028 is a combined sewer area covering 647 properties in Red Hook, Brooklyn. Flood Form rates 47% of them Moderate or High for stormwater exposure, and 63% for groundwater. 63% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 8 ft. The median building dates to 1925. 59% 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.
647
Properties in sewershed
63.1%
Legally eligible for on-site infiltration
47%
Stormwater exposure: Moderate or High
63%
Groundwater exposure: Moderate or High
What sets RH-028 apart
8 ft
Median ground elevation
78%
Average impervious cover per lot
1925
Median year built
59%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Red Hook 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
- RH-030Carroll Gardens482 properties · 40% with Moderate or High stormwater exposure
- RH-019Cobble Hill352 properties · 25% with Moderate or High stormwater exposure
- RH-031Carroll Gardens324 properties · 35% with Moderate or High stormwater exposure
- RH-018Cobble Hill242 properties · 33% with Moderate or High stormwater exposure
- RH-016Cobble Hill2,042 properties · 18% with Moderate or High stormwater exposure
- RH-035Carroll Gardens815 properties · 23% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form