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Ann Draper, Assistant Operating Officer National Levee Safety Summit, St. Louis Missouri, February 26, 2008. FloodSAFE – how one local agency works to keep its levees and public safe. About us . Located in Santa Clara County, California along South San Francisco Bay Home of Silicon Valley

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Ann Draper, Assistant Operating Officer

National Levee Safety Summit, St. Louis Missouri,

February 26, 2008

FloodSAFE– how one local agency works to keep its levees and public safe


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About us

  • Located in Santa Clara County, California along South San Francisco Bay

  • Home of Silicon Valley

  • Serve nearly 2 million residents

  • Integrated water resources agency

  • Drinking water wholesaler

  • Responsible for flood protection and stream stewardship


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Levees are significant to flood protection in Santa Clara County

More than 100 miles of levees protect thousands of parcels - 50 miles provide 100-year protection

Levees


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. County

66 % of 100-year levees met FEMA’s new certification standards


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Multiple actions required to ensure levee integrity and public safety

To do list:

Inspect

Control vegetation

Manage animal burrows

Repair erosion

Secure long-term permits

Ensure reliable funding sources

Keep community informed & satisfied


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Levee inspection must be systematic, consistent, verifiable public safety

Adequate levee inspection and maintenance is essential for providing a reliable flood protection system, reducing the risk of flooding and loss of life and property, as well as maintaining compliance with State and Federal regulations for funding and flood insurance requirements.

Adequate levee maintenance also ensures the accessibility and serviceability during flood events for emergency work.

This document describes general procedures and guidelines for field operations levee inspection and record keeping.


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Vegetation management has many purposes, considerations public safety

  • Allow for ease of inspection

  • Help with fire prevention

  • Recognize neighbors’ concerns with aesthetics, viewshed


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Burrow management is complex, crucial to ensuring levee integrity

Needs, behaviors of several species must be considered

California ground squirrel – the primary local species responsible for burrowing into levees

Salt marsh harvest mouse – a state and federal endangered species; bait stations used for ground squirrels must be specially designed to prevent inadvertent poisoning of the mouse

Western burrowing owl – a California species of special concern; often makes its home in abandoned ground squirrel burrows


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Burrow management is complex, crucial to ensuring levee integrity

Burrow must be vacated before repairs can begin

2

1

bait station

active burrow

Coyote Creek,

San Jose, CA


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Burrow management is complex, crucial to ensuring levee integrity

Burrows are deep and extensive

Coyote Creek,

San Jose, CA


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Burrow management is complex, crucial to ensuring levee integrity

Potential solution: bentonite clay slurry grout pumped into burrow entrances. Exploratory excavation confirms mixture completely fills and seals burrows.

Coyote Creek,

San Jose, CA


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Corrective maintenance cannot be overlooked integrity

San Jose, CA

Before

Porta-dam

Coyote Creek levee repair project

Rock toe

After


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Long-term permits are key to continuity of levee safety activities

10-year Stream Maintenance Program

August 2001

Permits from:

San Francisco Bay Regional

Water Quality Control Board

Central Coast Regional

Water Quality Control Board

U.S. Army Corps of Engineers

Department of Fish and Game


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Reliable funding sources must be secured activities

Santa Clara Valley Water District has spent more than $4 million on levee safety since fiscal 2002


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Community outreach improves flood hazard awareness activities

Annual direct mail to owners

and residents of floodprone properties

School outreach

Web pages


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Customer outreach and feedback confirms public support activities

3-year average

Completed project was a benefit to the neighborhood

89%

Good/excellent rating for overall job performance

92%

2152 responses




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Collaboration between local, state & federal agencies benefits our mutual constituency

Our shared future


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Santa Clara County, California benefits our mutual constituency a FloodSAFE community


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