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Friday, March 18, 2016

The Manhattan Municipal Building Water Shed

   Several of my last postings dealt with the ease of creating a watershed map using ARCGIS on-line vs. the difficulty of doing it several years ago in GRASS.  One blog that deals with streetlamps and New York and various forms of Transportation (Forgotten NY) had a posting on the mysterious and perhaps haunted Chamber Street subway station at Chambers  and Centre Street Manhattan, under the Municipal Building.  That station has what is called a "water condition" and the site where the Municipal Building  is located was once the site of a pond or some sort of collect pool, according to old maps.  I ran a watershed analysis in ARCGIS on-line and the results are above for a focal point of Chambers and Centre Streets.  The watershed is shown bounded by the red line..  It is interesting to note that in the bounded region, there is a park called the "Collect Pond Park" and is one source perhaps of the water.  The range was set at 1000 feet.  Larger ranges over 2000 feet creates a watershed that goes to Brooklyn, which is an impossibility because of the East River.

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