Sewershed WI-071 · NYC DEP Combined Sewer Overflow Tributary Area
WI-071 - Port Morris, Bronx
Properties in this area share the WI-071 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 Port Morris, Bronx specifically.
WI-071 is a combined sewer area covering 228 properties in Port Morris, Bronx. Flood Form rates 44% of them Moderate or High for stormwater exposure, and 31% for groundwater. 57% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 36 ft. The median building dates to 1931. 21% of parcels sit over a historic stream or pond.
228
Properties in sewershed
56.6%
Legally eligible for on-site infiltration
44%
Stormwater exposure: Moderate or High
31%
Groundwater exposure: Moderate or High
What sets WI-071 apart
36 ft
Median ground elevation
86%
Average impervious cover per lot
1931
Median year built
21%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Port Morris 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
- WI-070Port Morris109 properties · 52% with Moderate or High stormwater exposure
- WI-072Melrose583 properties · 37% with Moderate or High stormwater exposure
- WI-067Mott Haven265 properties · 23% with Moderate or High stormwater exposure
- WI-066Mott Haven139 properties · 56% with Moderate or High stormwater exposure
- HP-002Hunts Point824 properties · 42% with Moderate or High stormwater exposure
- WI-064Concourse213 properties · 43% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form