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description:
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Official NYC East-of-Hudson and West-of-Hudson outer watershed boundaries delineated from 2009 LiDAR-derived 1-meter Digital Elevation Model (DEM). This representation of the NYC watershed replaces earlier versions that were based on lower-resolution information and is to be used for any NYCDEP BWS regulatory or programmatic mapping. These data are not a substitute for on-site inspection or survey, however, in cases where a location that is close to the border of this GIS representation is questioned.
FALL 2020 NOTE: In Fall 2020, two changes were made to the official NYC watershed and basin boundaries as follows: 1) The Diverting Reservoir boundary in EOH was updated, which in-turn required a change in the basin and subbasin boundary there. 2) Based on the results of a watershed boundary field inspection by REP and GIS Staff, as per the watershed delineation SOP, a very small portion of the outer Cannonsville Basin boundary in WOH, T. Delhi required updating, which in-turn required a change in the basin and subbasin boundary there. This resulted in a loss of .5 acres in the WOH watershed and the Cannonsville Basin. These changes have been reflected in this basin-derived dataset.
NOTE: This layer has been clipped to the Westchester County boundary (2022) |