site planning and infrastructure - aventri...lid site planning principles 1. conserve natural areas...
TRANSCRIPT
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PUGET SOUND LID TECHNICAL WORKSHOP SERIES
Site Planning and Infrastructure Jeff Cox, ASLA
Rick Tomkins, PE
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• Site Planning and Infrastructure
• Brief Overview of Site Planning Considerations
• Review of 3 Completed LID Projects
- Site Planning Considerations
- LID Elements
- Infrastructure
- Lessons Learned
• Questions and Answers
Agenda
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Traditional Site Planning Considerations
Project Context: Land Use, Zoning, and Development Regulations, Cultural Constraints
Physical and Natural Constraints
Storm Water Management
Circulation Requirements for Vehicles, Bicycles, and Pedestrians
Utility Availability and Location
Integrating Park and Open Space
Costs
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Additional Considerations for LID Projects
• For LID Projects, the Following Principles Must Be Emphasized Early in the Site Planning Process:
1. Understanding of Development Goals
2. Conserve Natural Areas
3. Minimize Site Disturbance
4. Minimize Impervious Coverage
5. Disconnect Impervious Areas
6. Maintain Site Hydrology
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LID Site Planning Principles
1. Conserve Natural Areas
Protect Sensitive Resources
Cluster Improvements
Retain Trees, Native Vegetation
Create Connected Open Spaces
2. Minimize Site Disturbance
Reduce Disturbance Envelope
Minimize Cuts / Fill
Avoid Site’s More Pervious Areas
Consolidate Construction Activities
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LID Site Planning Principles
3. Minimize Impervious Coverage
Reduce Pavement Width / Sidewalk
Incorporate Permeable Surfacing
Soil Amendments
Green Roofs
4. Disconnect Impervious Areas
Reduce Effective Impervious Area
Minimize Closed Pipe Conveyance
Utilize Multiple Small-Scale Facilities
Dispersion not Point Discharge
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LID Site Planning Principles
5. Maintain Site Hydrology
Reduce Runoff Leaving the Site
Discharge at the Natural Location
Distribute Flows in Sheet Fashion
Provide for Recharge
Promote Drainage Contact w/Soil and Vegetation
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LID and Infrastructure Design
Project Infrastructure Constraints
• Integrate into Existing Built Environment
• Influence of Road Design
• Site Plan Dictates
• Storm Water Management
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Review of Three Completed LID Projects
• Danielson Grove , City of Kirkland
Cottage Company, Ross Chapin
• Kirkland Bungalows, City of Kirkland
CamWest Development, Mithun Partners
• Shamrock Heights, King County
CamWest Development, Dahlin Group
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
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Danielson Grove
Road Section
Site Plan
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Danielson Grove
Composite Utility Plan
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Danielson Grove
Road and Storm Drainage Plan
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Danielson Grove
Sanitary Sewer and Water Plan
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Lessons Learned
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Kirkland Bungalows
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Kirkland Bungalows
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Kirkland Bungalows
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Kirkland Bungalows
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Kirkland Bungalows
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Kirkland Bungalows
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Kirkland Bungalows
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Alternative Street Section
Low Impact Road Section
Driveway Infiltration Trench Detail Trench to Swale Detail
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Road and Storm Drainage Plan
Kirkland Bungalows
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Water and Sewer Plan
Kirkland Bungalows
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Lessons Learned
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Lessons Learned
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Lessons Learned
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Shamrock Heights, King County
• 34.5 acres
• 25 acres developed
• 73 LID lots
• 129 total # of Lots
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Plan View
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Rain Garden
Rain Garden Section
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Rain Garden
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Rain Garden
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Rain Garden
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Rain Garden
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Rain Garden
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Bioretention Swale
Bioretention Swale Profile
Bioretention Swale Section
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Bioretention Swale
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Bioretention Swale
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Bioretention Swale
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Curb Drop
Grass-Lined Conveyance Swale Low Impact Flow Through Curb
Road Section
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Curb Drop
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Shamrock Heights Monitoring
Sampling Period
Water Quality (Grab Samples at Inlet)
Water Quantity
• Begins at 75% occupancy
• 3 years of data
• Turbidity
• Total Suspended solids
• Dissolved zinc
• Hardness
• Continuous recording of flow at outfall of both ponds
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LID Benefits Realized
• Enhanced water quality
• Relatively high densities achieved
• Reductions in infrastructure footprint and cost
• Differentiation in the market place.
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PUGET SOUND LID TECHNICAL WORKSHOP SERIES
Site Planning and Infrastructure
Questions?