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Duluth Watersheds
MillerChester
Tischer
Amity
Aerial Photos
Impervious Surfaces
Relationship Between % Imperviousness and Water Quality
8080
7070
6060
5050
4040
3030
2020
1010
00
ADAPTED FROM SCHUELER, ET. AL., 1992STREAM DEGRADATION
WA
TER
SH
ED
IM
PER
VIO
US
NES
S(%
)
DEGRADED
PROTECTED
IMPACTED
Impervious Surface is a Strong Indicator of Water Quality
Current Impervious Surfaces by Watershed
Land Use/Cover
NEMO Classes
Red – Urban areas, roads and railroadsYellow – Farmsteads and rural developmentsGreen – Forested areasBrown – Grasslands, agricultural, bare rock, gravel pits, regeneration forestBlue – Open water, wetlands
Zoning Boundaries
City of Duluth Land Use/Covercombined with
zoning boundaries
Removal of Steep Slopes
Removal of Steep Slopes and Wet areas
Removal of Steep Slopes, Wet areas, and current
Impervious areas
Build-out Impervious Surfaces