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Rapid Project Identification and Conceptual Designfor Green Infrastructure
Dan Cloak, P.E. April 8, 2015
Topics
• Using Google Maps to identify projects• Desktop screening and
conceptualization using Street View• Project investigation
– Utility information– Site reconnaissance and measurements
• Conceptual design process– Example and preliminary insights
• 8 Projects: Status and Next Steps
Watershed Scale (Map View)
• Old Urban– Street Grid
• Arterial Streets• Old Industrial
– Near water and rail
– Large parcels
Subwatershed Scale (Satellite)
Subwatershed Scale (Satellite)
Desktop Screening (Street View)
Desktop Screening (Street View)
Utilities
Site Reconnaissance
Conceptual Design
Alum Rock Ave. at Birch Lane
30 x 30
385 x 30
50 x 500
85 x 30
150 x 10
43 x 290
Calculations
Bioretention at low end 30 x 30 = 900
Tributary area max. @ 0.04 900 X 25 = 22,500
Alum Rock Avenue 385 x 30 = 11550
Frontage Street 85 x 30 = + 2550
Total Tributary Area 14100
Next upgradient bioretention facility
Birch Lane 50 x 500 25000
Frontage Street 43 x 290 + 12470
Total Tributary Area 37470
Bioretention Area Required 37470 x .04 1500
Length along 10-foot-wide median 1500/10 150
Alum Rock at Pleasant Ridge
Alum Rock At Pleasant Ridge
400 x 50460 x 40
245 x 37
50 x
500
Alum Rock at Pleasant Ridge
Summary: Alum Rock
• About 50,000 SF (1.1 acres) arterial roadway• Additional 72,000 SF (1.6 acres) residential streets• Plus portion of residential lots draining to street• 3 bioretention facilities totaling about 5230 SF• Need for traffic calming and pedestrian access
Some preliminary insights
• This is a craft• Potential sites are easy to find
– But are not available in all areas
• Subtle differences in elevation determine feasibility and cost
• Creating changes to surface drainage will be a key part of many projects– Overlays– Removing catch basins– Using trench drains
Eight Projects
Location Type
1 Alum Rock Ave. Arterial Street/Residential Streets
2 Commercial St. Old Industrial Street and Facility Entrance
3 Hedding Street Arterial - Disperse runoff to airport approach area
4 San Felipe Road Suburban Arterial
5 N. 5th St. Bioretention facilities in residential parkway strips
6 St. James Alleyways Permeable Pavement and Infiltration Trenches
7 South Grant St., San Mateo
Curb extensions/bulb outs in mixed-use area
8 River Oaks Pump Station
Divert dry weather and low flows to bioretention
Format for Work Product
• Rapid Project Identification & Conceptual Design– Methods and Applicability
• Section for each of eight projects– Detailed narrative description of design
• Issues, opportunities, potential conflicts• Design considerations. proposed solutions• Issues to be resolved in next design stage
– Marked-up satellite photos• Tributary areas (with dimensions)• Facility footprints (with dimensions)• Direction of flow, storm drain connections
– Calculations for treatment or dispersal area– Site photographs– Concept-level cost estimates
•