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CITY OF PALO ALOTO

MATADERO CREEK RENATURALIZATION

December 5, 2019 // NVCAP Working Group Meeting

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Presentation Overview

• Project Status Update • Planning Outcomes • Design Alternatives • Discussion • Aesthetics

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Project Completion

• Design Planning – 90%

• Site Assessment – 100%

• Define Alternatives – 80%

• Hydraulic Modeling – 60%

• Site Concept Design – 35%

• Coordination - Ongoing

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• Poor habitat • Poor aesthetics • No public access • No geomorphic function

Problems

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• NVCAP • Redevelopment of 340 Portage • City acquisition of 3350 Birch

Opportunities

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• Beautify the creek corridor • Create public access and

connection to the creek • Create habitat • Provide mitigation planting

Objectives

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• Real estate • Flood conveyance • Public safety • Groundwater plume • Valley Water easement • Maintenance access • Maintenance cost • Channel stability • Bridge conveyance • Provide mitigation planting • Other city and public intereste

Constraints

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Alternative #0: No Action

• Lowest cost • No improvement

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Alternative #1:

• Work within boundaries of current SCVWD easement (60 ft)

• Lambert Ave to Park Blvd • Earthen channel bottom • Vertical sheet pile or concrete walls • Riparian plantings • Floodwalls to mitigate increase in

100-year flood WSEL • Public access

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Alternative #1

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Alternative #2:

• Provide access, form and function, with limited scope

• Lay left bank back, transitioning from vertical to 3:1 (H:V)

• Add walking paths and public access • Same bottom width as existing • Ornamental plantings • Low-flow channel meanders • Earthen channel bottom • Floodwalls to manage flood risk

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Alternative #2

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Alternative #2A

• Same as Concept #2, but expand to include same approach in Boulware Park

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Alternative #2A

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Alternative #3

• Maximum ecological function • Vertical walls • Roughly 3.5 times existing width • Geomorphic bankfull meanders

from wall to wall • New maintenance access ramps • Public walking trail • Replace Lambert Bridge and Park

Blvd Bridge • Acquire properties between Lambert

and Park

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Alternative #3

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Alternative 1: Hydraulic Modeling, 1% Chance Event

Railroad

Park Blvd. Lambert Ave.

El Camino Real

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Next Steps

• Refinement of alternatives • Hydraulic modeling of refined

alternatives • Coordination with Valley Water and

Resource Agencies • Documentation

Plan View of All Concepts

EXISTING ESTIMATED GROUNDWATERTOXIC PLUME BOUNDARYNOTE: DATA TAKEN FROM

WHATSDOWN.TERRADEX.COM

PROPOSEDSHEET PILE WALL EXISTING CONCRETE

WALL

EXISTINGSCVWD ACCESSRAMP

PROPOSED SHEET PILE WALL

EXISTING CONCRETEWALL

MATADERO CREEKCENTERLINE WITH

EARTHEN BOTTOM

PROPOSED PEDESTRIAN/BIKE PATH

PROPOSED PLANTINGS

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

PROPOSED SCVWDMAINTENANCEACCESS

EL C

AMIN

O R

EAL

LAMBERT AVENUE

PARK

BO

ULEV

ARD

ASH

STRE

ET

CHESTNUT AVENUE

ASH

STRE

ET

BOULWARE PARK

SCVWD EASEMENTBOUNDARY

CITY OF PALO ALTOMATADERO CREEK

RE-NATURALIZATIONFEASIBILITY STUDY

PALO ALTO,CALIFORNIA

CONCEPT 1PLAN VIEW

DATE: DECEMBER 2019FIGURE BY: ACSIMAGE SOURCE: AUTOCAD ROADS MAP

L:\Acad 2000 Files\29000\29113\CAD\dwg\29113_CONCEPT-1.dwgPath:

N

SCALE: 1 " = 100'

0 100

EXISTING ESTIMATED GROUNDWATERTOXIC PLUME BOUNDARYNOTE: DATA TAKEN FROM

WHATSDOWN.TERRADEX.COM

PROPOSEDSHEET PILE WALL EXISTING CONCRETE

WALL

EXISTINGSCVWD ACCESSRAMP

PROPOSED SHEET PILE WALL

EXISTING CONCRETEWALL

MATADERO CREEKCENTERLINE WITHEARTHEN BOTTOM

PROPOSED PEDESTRIAN/BIKE PATH

PROPOSED PLANTINGS

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

PROPOSED SCVWDMAINTENANCEACCESS

EL C

AMIN

O R

EAL

LAMBERT AVENUE

PARK

BO

ULEV

ARD

ASH

STRE

ET

CHESTNUT AVENUE

ASH

STRE

ET

BOULWARE PARKFR

Y'S

SCVWD EASEMENTBOUNDARY

CITY OF PALO ALTOMATADERO CREEK

RE-NATURALIZATIONFEASIBILITY STUDY

PALO ALTO,CALIFORNIA

CONCEPT 2PLAN VIEW

DATE: DECEMBER 2019FIGURE BY: ACSIMAGE SOURCE: AUTOCAD ROADS MAP

L:\Acad 2000 Files\29000\29113\CAD\dwg\29113_CONCEPT-2.dwgPath:

N

SCALE: 1 " = 100'

0 100

EXISTING ESTIMATED GROUNDWATERTOXIC PLUME BOUNDARYNOTE: DATA TAKEN FROM

WHATSDOWN.TERRADEX.COM

PROPOSEDSHEET PILE WALL EXISTING CONCRETE

WALL

EXISTINGSCVWD ACCESSRAMP

PROPOSED SHEET PILE WALL

EXISTING CONCRETEWALL

MATADERO CREEKCENTERLINE WITHEARTHEN BOTTOM

PROPOSED PEDESTRIAN/BIKE PATH

PROPOSED PLANTINGS

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

PROPOSED SCVWDMAINTENANCEACCESS

EL C

AMIN

O R

EAL

LAMBERT AVENUE

PARK

BO

ULEV

ARD

ASH

STRE

ET

CHESTNUT AVENUE

ASH

STRE

ET

BOULWARE PARK

FRY'

S

SCVWD EASEMENTBOUNDARY

PROPOSEDSCVWD ACCESS

RAMP

MATADERO CREEKCENTERLINE WITHEARTHEN BOTTOM

PROPOSED SHEET PILE WALL

PROPOSED PEDESTRIAN/BIKE PATH

CITY OF PALO ALTOMATADERO CREEK

RE-NATURALIZATIONFEASIBILITY STUDY

PALO ALTO,CALIFORNIA

CONCEPT 2APLAN VIEW

DATE: DECEMBER 2019FIGURE BY: ACSIMAGE SOURCE: AUTOCAD ROADS MAP

L:\Acad 2000 Files\29000\29113\CAD\dwg\29113_CONCEPT-2A.dwgPath:

N

SCALE: 1 " = 100'

0 100

EXISTING ESTIMATED GROUNDWATERTOXIC PLUME BOUNDARYNOTE: DATA TAKEN FROM

WHATSDOWN.TERRADEX.COM

PROPOSEDSHEET PILE WALL

EXISTINGSCVWD ACCESS

RAMP

PROPOSED SHEET PILE WALL

EXISTING CONCRETEWALL

MATADERO CREEKCENTERLINE WITHEARTHEN BOTTOM

PROPOSED PEDESTRIAN/BIKE PATH

PROPOSED PLANTINGS

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

MATADERO CREEKCENTERLINE WITH

CONCRETE BOTTOM

PROPOSED SCVWDMAINTENANCEACCESS

EL C

AMIN

O R

EAL

LAMBERT AVENUE

PARK

BO

ULEV

ARD

ASH

STRE

ET

CHESTNUT AVENUE

ASH

STRE

ET

BOULWARE PARK

FRY'

S

SCVWD EASEMENTBOUNDARY

PROPOSEDSCVWD ACCESS

RAMP

MATADERO CREEKCENTERLINE WITHEARTHEN BOTTOM

PROPOSED SHEET PILE WALL

PROPOSED PEDESTRIAN/BIKE PATH

CITY OF PALO ALTOMATADERO CREEK

RE-NATURALIZATIONFEASIBILITY STUDY

PALO ALTO,CALIFORNIA

CONCEPT 3PLAN VIEW

DATE: DECEMBER 2019FIGURE BY: ACSIMAGE SOURCE: AUTOCAD ROADS MAP

L:\Acad 2000 Files\29000\29113\CAD\dwg\29113_CONCEPT-3.dwgPath:

N

SCALE: 1 " = 100'

0 100

60'

~85'

100'

CONCEPT #0: NO ACTION ALTERNATIVE (30FT WIDTH)

CONCEPT #1: SCVWD EASEMENT ONLY (60FT)· WITHIN BOUNDARIES OF CURRENT SCVWD EASEMENT· EARTHEN CHANNEL BOTTOM· VERTICAL SHEET PILE WALLS· RIPARIAN PLANTINGS· FLOODWALLS TO MITIGATE INCREASE IN 100-YEAR FLOOD WSEL· PUBLIC ACCESS

CONCEPT #2: SAN LUIS OBISBO-STYLE IN PARKING LOT (~85FT)· OPTIMIZE ACCESS, FORM AND FUNCTION, WITH LIMITED SCOPE· LAY LEFT BANK BACK, TRANSITIONING FROM VERTICAL TO 3:1 (H:V) WITH TERRACES· ADD WALKING PATHS AND PUBLIC ACCESS· SAME BOTTOM WIDTH AS EXISTING· ORNAMENTAL PLANTINGS· LOW-FLOW CHANNEL MEANDERS· EARTHEN CHANNEL BOTTOM· FLOODWALLS TO MANAGE FLOOD RISK

CONCEPT #2A: SAN LUIS OBISBO-STYLE FROM CHESTNUT TO PARK BLVD (~85FT)· SAME AS CONCEPT #2, BUT EXPAND TO INCLUDE SAME APPROACH BOULWARE PARK

CONCEPT #3: CHANNEL MIGRATION ZONE FROM CHESTNUT TO PARK BLVD (100FT)· MAXIMUM FORM AND FUNCTION· VERTICAL SHEET PILE WALLS· ROUGHLY 4 TIMES EXISTING WIDTH· GEOMORPHIC BANKFULL MEANDERS FROM WALL TO WALL· NEW MAINTENANCE ACCESS RAMPS· PUBLIC WALKING TRAIL· REPLACE LAMBERT BRIDGE AND PARK BLVD BRIDGE· ACQUIRE PROPERTIES BETWEEN LAMBERT AND PARK

SHEET PILE FLOODWALL SHEET PILE FLOODWALL

SHEET PILE FLOODWALL SHEET PILE FLOODWALL

SHEET PILE FLOODWALLSHEET PILE FLOODWALL

MAINTENANCEACCESS

MAINTENANCEACCESS

MAINTENANCEACCESS

SHEET PILE WALL

CITY OF PALO ALTOMATADERO CREEK

RE-NATURALIZATIONFEASIBILITY STUDY

PALO ALTO,CALIFORNIA

SECTION VIEWS

DATE: DECEMBERR 2019FIGURE BY: ACS

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