Concept plan development incorporating flood mitigation into an ecosystem restoration project
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Concept Plan Development Incorporating Flood Mitigation into an Ecosystem Restoration Project. Westside Creeks Restoration Project. 2 nd National Flood Workshop: February 29, 2012. Historical Background - Significance. Historical Background - Flooding. Historical Background - Flooding.

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Concept Plan Development Incorporating Flood Mitigation into an Ecosystem Restoration Project

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Concept plan development incorporating flood mitigation into an ecosystem restoration project

Concept Plan DevelopmentIncorporating Flood Mitigation intoan Ecosystem Restoration Project

Westside Creeks Restoration Project

2nd National Flood Workshop: February 29, 2012


Historical background significance

Historical Background - Significance

2nd National Flood Workshop: Westside Creeks Restoration


Historical background flooding

Historical Background - Flooding

2nd National Flood Workshop: Westside Creeks Restoration


Historical background flooding1

Historical Background - Flooding

2nd National Flood Workshop: Westside Creeks Restoration


Historical background channelization

Historical Background - Channelization

2nd National Flood Workshop: Westside Creeks Restoration


Historical background channelization1

Historical Background - Channelization

2nd National Flood Workshop: Westside Creeks Restoration


Existing condition discharges

Existing Condition - Discharges

  • Bankfull Discharge

  • The formative flow of water that characterizes the morphology (shape) of a fluvial channel

  • Typically associated with a 1.5-year return period flow

2nd National Flood Workshop: Westside Creeks Restoration


Existing condition floodplain

Existing Condition - Floodplain

Flood Depth

0 – 1’

1 – 2’

2 – 5’

2nd National Flood Workshop: Westside Creeks Restoration

5 – 10’

10+’


Existing condition habitat

Existing Condition - Habitat

2nd National Flood Workshop: Westside Creeks Restoration


Existing condition base flow

Existing Condition - Base Flow

2nd National Flood Workshop: Westside Creeks Restoration


Existing condition neighborhoods

Existing Condition - Neighborhoods

2nd National Flood Workshop: Westside Creeks Restoration


Design process catalyst sites

Design Process - Catalyst Sites

2nd National Flood Workshop: Westside Creeks Restoration


Design process fluvial geomorphology

Design Process - Fluvial Geomorphology

>>> Increasing Sediment Supply >>>

Moderate Stream Slope

Flat Stream Slope

Steep Stream Slope

2nd National Flood Workshop: Westside Creeks Restoration


Design process vegetation

Design Process - Vegetation

  • Natural Succession takes place over centuries

  • This goal of this project is to take the Westside Creeks from barren flood channels to a “climax community” in ~50 years

2nd National Flood Workshop: Westside Creeks Restoration


Design process flood mitigation

Design Process - Flood Mitigation

2nd National Flood Workshop: Westside Creeks Restoration


Concept plan aerial view

Concept Plan - Aerial View

2nd National Flood Workshop: Westside Creeks Restoration


Degrees of restoration intensity

Degrees of Restoration Intensity

Type A: This restoration alternative defines locations where the extents of stream modifications are expected to remain essentially within existing ROW limits and publicly owned property.

Type B: In locations where additional property may be required to meet flood mitigation needs, the restoration alternative is shown with potential ROW expansion into existing privately owned properties. Flood mitigation is being coordinated with the Master Planning efforts in the San Antonio River basin and the dredging project in Elmendorf Lake.

2nd National Flood Workshop: Westside Creeks Restoration


Project phasing

Project Phasing

The first phase recommended for implementation includes 9 stream reaches (4 Type A and 5 Type B) and trails along the entire Westside Creeks, totaling approximately $300M.

Of these Phase 1 projects, 4 were selected as initial demonstration projects (Totaling $50M, + $10M for trails on all other stream reaches, in coordination with the Linear Trails Initiative):

2nd National Flood Workshop: Westside Creeks Restoration


Concept plan cross sections

Concept Plan - Cross Sections

Alazán Reach 1 (Type A)

Apache Reach 1 (Type B)

Martínez Reach 2 (Type B)

San Pedro Reach 2* (Type A)

2nd National Flood Workshop: Westside Creeks Restoration


Concept plan phasing

MA-1

Concept Plan - Phasing

MA-2

AL-1

MA-3

AL-2

MA-4

AL-3

MA-5

AP-1

AL-4

SP-1

AL-5

SP-2*

AP-2

AL-6

SP-3

AP-4

AL-7

SP-4

AP-3

AP-5

SP-5

SP-6

SP-7

2nd National Flood Workshop: Westside Creeks Restoration


Concept plan cost estimate

Concept Plan - Cost Estimate

2nd National Flood Workshop: Westside Creeks Restoration


Schedule

Schedule

2nd National Flood Workshop: Westside Creeks Restoration


Conceptual plan documents

Conceptual Plan Documents

  • Appendix

    • Historic Resources

    • Public Meeting Minutes

    • Existing Conditions

    • Stable Channel Design

    • Cost Estimates

  • Report

    • Introduction

    • Plan Context

    • Community Vision

    • Existing Conditions

    • Stream Restoration Approach

    • Economic Development

    • Restoration Concept

    • Implementation

    • Glossary

2nd National Flood Workshop: Westside Creeks Restoration


For more information

For More Information

[email protected]

+1 (512) 457-7884 (office)

+1 (210) 381-3390 (mobile)

2nd National Flood Workshop: Westside Creeks Restoration


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