Sewershed NCM-005 · NYC DEP Combined Sewer Overflow Tributary Area
NCM-005 - Lenox Hill, Manhattan
Properties in this area share the NCM-005 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 Lenox Hill, Manhattan specifically.
NCM-005 is a combined sewer area covering 392 properties in Lenox Hill, Manhattan. Flood Form rates 38% of them Moderate or High for stormwater exposure, and 9% for groundwater. 63% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 53 ft. The median building dates to 1910. 19% of parcels sit over a historic stream or pond.
392
Properties in sewershed
63%
Legally eligible for on-site infiltration
38%
Stormwater exposure: Moderate or High
9%
Groundwater exposure: Moderate or High
What sets NCM-005 apart
53 ft
Median ground elevation
96%
Average impervious cover per lot
1910
Median year built
19%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Lenox Hill 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
- NCM-032Turtle Bay156 properties · 46% with Moderate or High stormwater exposure
- WI-003Lenox Hill1,428 properties · 55% with Moderate or High stormwater exposure
- NCM-036Upper East Side1,944 properties · 56% with Moderate or High stormwater exposure
- NCM-034Turtle Bay131 properties · 66% with Moderate or High stormwater exposure
- WI-008Upper East Side1,184 properties · 31% with Moderate or High stormwater exposure
- BB-027Queensbridge130 properties · 58% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form