Elmt_ID Chan_ID Contributing_Area (ha) Channel_Type
   26    1            14.79                perennial 
   27    2             5.59                perennial 
   28    3            16.59                perennial 
   29    4            27.42                perennial 
   30    5             7.40                perennial 
   31    6            19.50                perennial 
   32    7            42.39                perennial 
   33    8            72.32                perennial 
   34    9            82.11                perennial 
   35   10           109.53                perennial 
   36   11           124.33                perennial 
   37   12            16.35                perennial 
   38   13           173.67                perennial