WhereItGoes.org shows your personal sewage and stormwater overflow infrastructure. In a heavy rainstorm, sewage and stormwater mix and discharge into local waterways at CSOs (Combined Sewage Overflows).

WhereItGoes.org estimates the flow of stormwater and sewage for any address you provide. Factoring in rainfall, elevation and information about city-wide infrastructure, interactive maps show you the most likely CSOs serving your block.

Change location on the map, and see the CSO mapping change. Click a CSO to read more about it, upload your photos and leave comments. Add a CSO to your watch list, and get alerts via email, SMS or social media when an overflow is imminent.

(For more on CSOs in NYC, check out Storm Water Infrastructure Matters.)