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Planning Study
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Sanla Clara Valle~
Waler Dislricl
San Francisco Bay to Foothill Expressway
Presentation for:
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Cupertino City Council
March 6. 2007
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To brief City Council
members on top rated feasible
alternatives and identify potential
issues and opportunities
· What are the Flood Protection Issues?
· How can Flood Damages be Reduced?
. Planning Process
. Key Project Elements
. Feasible Project Alternatives
· Schedule
. Past floods in 1911, 1940, 1950, 1952, 1955,
1958,1983, 1995, and 1998
. In the 1950/60s, District built Permanente
Diversion channel and other concrete channels
. 1 % flood affects more than 3,100 properties
($48 million in damages per event)
. Numerous homes and businesses
in Los Altos and Mountain View
. Transportation: EI Camino Real,
Central Expressway, Miramonte Ave,
Springer Rd, and many local streets
. EI Camino hospital surrounded by
flood waters
. Schools: Bubb, Crittenden, Blach,
St. Francis, St. Joseph, etc, flooded
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. Public facilities such as Cuesta
Park and Annex, Eagle Park, etc.
flooded
~
3 Flood
Depth
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'Hundreds of feet of channel have
been repaired and replaced
'Thousands of feet of channel
require replacement in near future
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ays'tOProvid'e Flood Protection:
A) Flood Peak Reduction (Flood Detention)
B) Bypass Channels
C) Channel Improvement
D) Flood Proofing
Post. flood
Sediment
Deposition
. How can Flood Damages be Reduced?
· Planning Process
2
Marshal many ooints of view issues and aotions
Comprehensively address the exoectations of the community
Secure the health, safety and quality of life of the community via
flood orotection
Provide qdditional trails Darks and opens spaces along creeks
Ensure the benefits of streams and natural resources are orotected
or restored to ensure their benefits to the community's quality of life
Balance the following Natural Flood Protection objectives:
- Cooperation with local agencies achieves mutually beneficial goals
- Homes. school, business. and transportation networks are protected
from flooding and erosion
- Ecobgical functions and processes are supported
- Physical stream functions and processes are integrated
- Projects are integrated within the watershed as a whole
- The quality and availability of water is protected
- Community benefits beyond flood protection
- Ufe-cycle costs are minimized
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Key Flood
Protection
Elements
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Goal:
. Protect the 1667 parcels in 1% floodplain north of EI Camino Real by 2016
Planning Process:
Planning area: Entire watershed from Santa Cruz Mts.-SF Bay
20 project elements developed
25 conceptual alternatives developed and screened
10 feasible alternatives
Feasible alternatives rated as to ability to meet Natural Flood Protection (NFP)
objectives
Community Input:
Seven Permanente Task Force meetings
Six public meetings
Resource agency meetings
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. Presentation Coverage:
Key Project Elements
3
Concrete channel
to be removed and
_with
vegetated urth
Channel with one
bank ntmIIlnlng
concrete
Benefits
Flood protection for Mt.
View and Los Altos
Protect about 3500 It of
Hale Cr. habitat
Constraints
Temporary construction
impact for 2-4 years (in
stages)
ntonio
8erwrflts
8 acres r.j endar:'9ered Red
;.,'~~:rog habttat potentially
Early flOOd ~roteclion to Min.
VI~ and City r.j Los Alios
Reduce construcllon Impact to
residential & buSiness areas
Minimal disruption of pari< use
Is.ueslConstralnls
T~p~ary c~struction
dlsrupbon (nOlseldust)
Visual impact 10 nearby houses
Rej)lacement of upstream
maintenance bridge
Public support
Benefits
Flood protection to Mountain View
. New facilities - all weather playing surface
Constraints
Temporary construction Impact (approx. 1 year)
Restoration of fields after detention
Public support
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Annex
Benefits
. Flood protection to Mountain View
. Collaboration opportunity for
City concept B
Constraints
. Temporary construction impact (1-2
years)
. Public support
Features:
. 15 fl by 8 acre
contoured depression
area
.1Q-year flood
inundation frequency
'Planting of native
trees
'Removal of non-
native trees
4
Benefits
Flood protection to
Mountain View and Los
Altos residents
Reduce construction
impact to residential area
Constraints
Impact to 12 acres of
existing habitat (red-
legged frog)
Very high mitigation cost
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Ffr~~~~t~iion' Coverage:
Schedule
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Presenfation'toverage:
Feasible Project Alternatives
Recreational
. Potential 2000 ft of new trails in Mountain View (Middlefield Way to Middlefield)
. parks/open space protection
Flood protection
. From 1667 parcels to 2.190 parcels protected under CSC (All S)
. El Camino Real & Central Expressway protected
Environmental enhancement
PotentialS acres of red legged frog habitat enhanced (with Rancho San Antonio)
. 1.6 mites of natural creek preserved
. 1.3 mites of creek restoration (with all detention alts)
Efficiency of public funds
Combine design effort
Combine EIR effort
. Combine outreach effort
5
Sanla Clara Valle~
Waler Dislricl
Phase 1: 1,670 parcels $53M
Floodwalls
Channel Widening
Culvert Expansion
EI Camino Bypass
EI Camino Flood Collection
Culvert
Phase 2: 1500 parcels $52M
Hale Bypass
Permanente Bypass
Channel Widening
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Phase 1: 2,450 parcels $28m
Flow Detention:
South Branch Dam
Rancho San Antonio
McKelvey Park
Channel Widening
Floodwalls
Phase 2: 700 parcels $25m
Hale Bypass
Channel Widening
Riparian Restoration
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Phase 1: 1,670 parcels $56M
Floodwalls
Channel Widening
Long EI Camino Bypass
EI Camino Flood Collection
Culvert
Phase 2: 1500 parcels $52M
Hale Bypass
Permanente Bypass
Channel Widening
Phase 1: 2,190 parcels $27m
Flow Detention:
Rancho San Antonio
. Cuesta Annex
. McKelvey Park
Channel Widening
Floodwalls
Phase 2: 980 parcels $32m
Hale Bypass
Permanente Bypass
Channel Widening
Riparian Restoration
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Phase 1: 2,190 parcels $26m
Flow Detention:
- Cuesta Annex
- McKelvey Park
Channel Widening
Floodwalls
Phase 2: 980 parcels $43m
Hale Bypass
Permanente Bypass
Channel Widening
Riparian Restoration
Phase 1: 2,860 parcels $33m
Flow Detention:
South Branch Dam
Rancho San Antonio
Cuesta Annex
Channel Widening
Floodwalls
Phase 2: 310 parcels $22m
Hale Bypass
Channel Widening
Riparian Restoration
Phase 1: 2,550 parcels $30m
Flow Detention:
- South Branch Dam
- Cuesta Annex
Channel Widening
Floodwalls
Phase 2: 610 parcels $30m
Hale Bypass
Channel Widening
Riparian Restoration
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Phase 1: 2,450 parcels $46m
Flow Detention:
South Branch Dam
- Rancho San Antonio
- EI Camino Bypass
Channel Widening
Floodwalls
Phase 2: 700 parcels $16m
Hale Bypass
. Channel Widening
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Phase 1: 2,190 parcels $26m
Flow Detention:
South Branch Dam
McKelvey Park
Cuesta Annex
Channel Widening
Floodwalls
Phase 2: 980 parcels $33m
Hale Bypass
Channel Widening
Riparian Restoration
Phase 1: 2,570 parcels $32M
Flow Detention:
- Rancho San Antonio
- Cuesta Annex
Extended Hale Bypass
Channel Widening
Floodwalls
Phase 2: 600 parcels $29M
Hale Bypass
Permanente Bypass
Riparian Restoration
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Benefits
. Reduce planning costs
. Opportunity to extend
Permanente Cr. trail to
Middlefield
Constraints
Reduced easement for
flood protection options
. Short duration (especially at peak)
. Well-suited to flow detention alternatives
. Episodic events
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Benefits
. Flood protection for Mt.
View and Los Altos
Protect about 3500 ft of
Hale Cr. habitat
Constraints
. Temporary
construction impact for
2-4 years (in stages)
8
Permanente Creek - Feasible Alternatives Cost Summary
Current Clean Safe Creeks Phase Cost
(for protection up to EI Camino Real):
Estimated number of Parcels Protected:
Estimated parcels Remaining in SCVWD
Floodplain:
Additional Funds Needed to provide
protection up to Foothill Ex.:
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Alt. D Alt. E Alt. GAIt. SAlt. T Alt. U Alt. V Alt. WAIt. X Alt. V
$53.0
1,670
1,500
$52.4
$55.6
1,670
1,500
$52.4
$28.3
2,450
700
$24.9
$27.1
2,190
980
$31.9
$25.9
2,190
980
$42.9
$45.7
2,450
700
$16.4
$33.1
2,870
310
$22.0
$25.6
2,190
980
$32.7
$30.1
2,570
600
$29.8
$31.7
2,570
600
$29.0
Total Capital Cost: $105.4 $108.0 $53.2 $59.0 $68.8 $62.1 $55.1 $58.3 $59.9 $60.7
Exceeds Exceeds Hanson, County, Hanson, Hanson, Hanson,
Issues: CSC CSC County, M K I McKelvey, County, County, McKelvey, Hanson, County,
c e vey, C t exceeds Cuesta Cuesta
Funds Funds McKelvey Cuesta ues a funds Cuesta Cuesta
Attachment 2
PermanentI' Creek Planning Study
Paue!s in Flood Plain: 3170
Mt. View: 2740
Los Altos: 430
SCV\VD 11~,u Flood Plain
FE1'\IA 1"-'" Flood Plain
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Pt"rmanente Creek
\Vatershed Boundd1'Y
Cupertino
Los Altos
Los Altos Hills
f\'Iountain View
P.uo Alto
Sunnyvale
Santa Clara County
Unincorporated
UNIN( '( m.l'(Ht\TII,1
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2. South Branch
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SoUNNY\ .\1 F
Road can be
relocated/
removed
Pump Station
(hidden by vegetation)
relocated/removed
Existing view from Cristo Rey Drive looking southwest
Visual simulation of proposed project
fNVIRON/l\fNIAL VISION
Visual Simulation
Rancho San Antonio Pond
Santa Clara County, California
CID305