Sewershed WI-012 · NYC DEP Combined Sewer Overflow Tributary Area
WI-012 - Yorkville, Manhattan
Properties in this area share the WI-012 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 Yorkville, Manhattan specifically.
WI-012 is a combined sewer area covering 353 properties in Yorkville, Manhattan. Flood Form rates 26% of them Moderate or High for stormwater exposure, and 25% for groundwater. 72% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 31 ft. The median building dates to 1920. 31% of parcels sit over a historic stream or pond.
353
Properties in sewershed
72%
Legally eligible for on-site infiltration
26%
Stormwater exposure: Moderate or High
25%
Groundwater exposure: Moderate or High
What sets WI-012 apart
31 ft
Median ground elevation
93%
Average impervious cover per lot
1920
Median year built
31%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Yorkville 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-011Yorkville399 properties · 33% with Moderate or High stormwater exposure
- WI-015Yorkville220 properties · 30% with Moderate or High stormwater exposure
- WI-016Yorkville204 properties · 25% with Moderate or High stormwater exposure
- WI-008Upper East Side1,184 properties · 31% with Moderate or High stormwater exposure
- WI-023East Harlem930 properties · 50% with Moderate or High stormwater exposure
- WI-003Lenox Hill1,428 properties · 55% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form