Urban Development

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Urban Development
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Urban Development
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Streamgage Record
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Effect on Storm Hydrographs

• Hydrologic Effects
• Larger peak discharge
• Increased runoff volume
• Decreased flow travel times

After
Q
Before
t
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Effect on Hydrologic Cycle
Before Urbanization
After Urbanization
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Impacts to Water Quality

• Before Urbanization

• After Urbanization

Phosphates
Water
Water
Pesticides
Nitrogen
Heavy Metals
Naturally Occurring Compounds
Oil
Sediments
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Riparian (Stream) Impacts

• Streambank stability

• Vegetation

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Riparian (Stream) Impacts

• Habitat suitability

• Aesthetics

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Traditional Stormwater Design

• Storm sewers
• Stream channel improvements
• Stormwater detention
• Floodplain zoning
• Infiltration basins

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Detention Pond Example

• Detention Pond

• Willow Creek downstream of pond

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Detention Pond Example

• Outlet Structure

• Maintenance??

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Traditional Stormwater Design

• Storm sewers
• Stream channel improvements
• Stormwater detention
• Floodplain zoning
• Infiltration basins

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Low Impact Development (LID)

• Stormwater Best Management Practices (BMP)
• Restoring a natural water balance
• enhanced overland flow
• native vegetation
• other infiltration enhancements
• Can address both stormwater quantity and quality

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Driveways

• Traditional Design

• Alternative Design

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Median Design

• Traditional Design

• Alternative Design

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Native Vegetation
Turf Grass
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Rain Garden
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Permeable Pavements

• Porous Asphalt
• Turf Blocks
• Wood Mulch
• Crushed Aggregate

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Potsdamer Platz, Berlin
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Comparisons...

• Turf Grass

• Native Vegetation

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Comparisons...

• Traditional Landscaping

• Native Landscaping

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Comparisons...

• The Urban Goose

• Real Wildlife

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Comparisons

• Lucent Technologies, Lisle, IL
• Before and After

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Comparisons...

• University Research Park, Madison, WI
• Before and After

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Ralston Creek and NE District Planning