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