IMPERVIOUSNESS ESTIMATES FROM NEMO:
Imperviousness by CT sub-regional basin, Fall 1994 - example of C.L.E.A.R. Weston map (1985 shown below,1990, 1995, 2002 also in rolling slide show).  NEMO is the umbrella group, CLEAR is "son of NEMO."


 
 


LEGEND
Green= less than 10% estimated to be covered by impervious surfaces "The emphasis here is on protective planning strategies"

Yellow = 11-25% impervious surfaces "Streams impacted...more degradation with further development"

Red= over 25% impervious surfaces;  "Streams are most likely degraded"

METHODOLOGY:
The 1990 LANDSAT satellite imagery is used to identify land cover categories.  These categories are assigned impervious values according to published estimates.  The impervious values are then averaged over subregional basins