Sewershed WI-059 · NYC DEP Combined Sewer Overflow Tributary Area
WI-059 - Morris Heights, Bronx
Properties in this area share the WI-059 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 Morris Heights, Bronx specifically.
WI-059 is a combined sewer area covering 378 properties in Morris Heights, Bronx. Flood Form rates 37% of them Moderate or High for stormwater exposure, and 21% for groundwater. 83% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 138 ft. The median building dates to 1930. 5% of parcels sit over a historic stream or pond.
378
Properties in sewershed
82.5%
Legally eligible for on-site infiltration
37%
Stormwater exposure: Moderate or High
21%
Groundwater exposure: Moderate or High
What sets WI-059 apart
138 ft
Median ground elevation
84%
Average impervious cover per lot
1930
Median year built
5%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Morris Heights 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-058Morris Heights490 properties · 20% with Moderate or High stormwater exposure
- WI-062Mount Eden3,099 properties · 44% with Moderate or High stormwater exposure
- WI-052Washington Heights365 properties · 33% with Moderate or High stormwater exposure
- NR-006Washington Heights657 properties · 53% with Moderate or High stormwater exposure
- WI-061Highbridge296 properties · 48% with Moderate or High stormwater exposure
- NR-017Washington Heights322 properties · 73% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form