Sewershed WI-070 · NYC DEP Combined Sewer Overflow Tributary Area
WI-070 - Port Morris, Bronx
Properties in this area share the WI-070 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-070 is a combined sewer area covering 109 properties in Port Morris, Bronx. Flood Form rates 52% of them Moderate or High for stormwater exposure, and 20% for groundwater. 51% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 15 ft. The median building dates to 1931. 26% of parcels sit over a historic stream or pond.
109
Properties in sewershed
51.4%
Legally eligible for on-site infiltration
52%
Stormwater exposure: Moderate or High
20%
Groundwater exposure: Moderate or High
What sets WI-070 apart
15 ft
Median ground elevation
88%
Average impervious cover per lot
1931
Median year built
26%
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-071Port Morris228 properties · 44% with Moderate or High stormwater exposure
- WI-067Mott Haven265 properties · 23% with Moderate or High stormwater exposure
- WI-072Melrose583 properties · 37% with Moderate or High stormwater exposure
- WI-066Mott Haven139 properties · 56% with Moderate or High stormwater exposure
- WI-031East Harlem155 properties · 33% with Moderate or High stormwater exposure
- WI-035East Harlem220 properties · 47% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form