Rapid Project Identification
and Conceptual Design
for 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
50 x
500
30 x
30
43 x 290
85 x 30
150 x 10
385 x 30
Calculations
Bioretention at low end
30 x 30 =
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
900
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
Length along 10-foot-wide median
1500/10
1500
150
Alum Rock at Pleasant Ridge
50 x 500
Alum Rock At Pleasant Ridge
245 x 37
460 x 40
400 x 50
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
•