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Legend (Public/Stormwater_System_Plan)

Wetted Drainage Classes (1)
Excessively drained Excessively drained
Somewhat excessively drained Somewhat excessively drained
Well drained Well drained
Moderately well drained Moderately well drained
Somewhat poorly drained Somewhat poorly drained
Poorly drained Poorly drained
Very poorly drained Very poorly drained
Dominant Hydrologic Soil Groups (HSG) (2)
 Information Not Available Information Not Available
A-Low Runoff Potential A-Low Runoff Potential
B-Moderately Low Runoff Potential B-Moderately Low Runoff Potential
C-Moderately High Runoff Potential C-Moderately High Runoff Potential
D-High Runoff Potential D-High Runoff Potential
Infiltration by Quarter Section (3)
<250 <250
250-500 250-500
500-750 500-750
750-1000 750-1000
1000-1250 1000-1250
1250-1500 1250-1500
1500-1750 1500-1750
1750-2000 1750-2000
2000-2250 2000-2250
2250-2500 2250-2500
2500-3000 2500-3000
>3000 >3000
USGS - Depth to Seasonal High Groundwater (5)
< 20 < 20
20 - 40 20 - 40
40 - 60 40 - 60
60 - 80 60 - 80
80 - 100 80 - 100
> 100 > 100
Taggart D Supplemental Depth to Groundwater (6)
< 10 ft < 10 ft
10-15 ft 10-15 ft
15-20 ft 15-20 ft
20-30 ft 20-30 ft
Holgate Lake Supplemental Depth to Groundwater (7)
0-10 ft 0-10 ft
10-20 ft 10-20 ft
20-30 ft 20-30 ft
30-40 ft 30-40 ft
40-50 ft 40-50 ft
> 50 ft > 50 ft
Plan Districts (8)
Cascade Station Cascade Station
Columbia South Shore Columbia South Shore
Wellfield Protection Area (9)
Percent Slope (11)
Less than 5% Less than 5%
5-10% 5-10%
10-15% 10-15%
15-20% 15-20%
Greater than 20% Greater than 20%
Regional Geology (12)
Alluvium Alluvium
Artifical fill Artifical fill
Basalt of Jenne Basalt of Jenne
Basalt of Powell Butte Basalt of Powell Butte
Basalt of Mt. Scott Basalt of Mt. Scott
Basalt of Ginkgo Basalt of Ginkgo
Basalt of Sand Hollow Basalt of Sand Hollow
Basalt of Waverly Heights Basalt of Waverly Heights
Neogene mudstones Neogene mudstones
Channel facies Channel facies
Coarse-grained facies Coarse-grained facies
Eolian Deposits Eolian Deposits
Fine-grained facies Fine-grained facies
Hillsboro Formation Hillsboro Formation
Landslide deposits Landslide deposits
Marine Sandstone Marine Sandstone
Ortley unit Ortley unit
R2 Grande Ronde Basalt R2 Grande Ronde Basalt
Sentinel Bluffs Sentinel Bluffs
Troutdale Formation Conglomerate Troutdale Formation Conglomerate
Undifferentiated Boring Lava Undifferentiated Boring Lava
Undifferentiated Col. River Basalt Undifferentiated Col. River Basalt
Winter Water unit Winter Water unit
Depth to Lithic Bedrock (13)
2 - 3 2 - 3
3 - 5 3 - 5
Depth to Fragipan (14)
< 2 < 2
2 - 3 2 - 3
3 - 5 3 - 5
Combined Sewer Basins (16)
Port of Portland DSM Boundary (17)