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Tuesday, November 13, 2012

GRASS's 6.4.1 Prediction of River Channels in Southern Staten Island

  In the map below, I used GRASS 6.4.1  Hydrology Program and the "Carve" option to predict river channels based on street elevation.  Instead of using the input "river stream" I used the subway line shape file.  The results indicate that at the western end of the Staten Island Rapid Transit Railway, there was an image of a river channel from Tottenvile to around Richmond Valley Station.  In addition, there appears to be a low lying area along Seguine Avenue near Wolfe's Pond Park.   I highlighted the potential "stream" areas in red pencil and it would interesting if some reader(s) can tell me if the map was accurate in predicting actual flooding conditions.  May the residents effected have a speedy recovery from their many hardships connected with the storm.  Tramway Null(0).

  In the map below, I brought in the Hurricane Zone layer for zones A,B and C, where A is the zone in most danger of flooding.  It appears that the river channel program was accurate in predicting Zone A.  The GRASS 6.4.1 program does take into effect the elevations but the hydrology option sought of outlines where a river type of channel may be created and you can see this clearly on portion of the Staten Island Rapid Transit right of way and near Seguine Avenue.

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