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

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