HomeMy WebLinkAboutCOUNCIL - AGENDA ITEM - 03/13/2007 - CANAL IMPORTATION PONDS AND OUTFALL PROJECT DATE: March 13, 2007 WORK SESSION ITEM
STAFF: Jim Hibbard FORT COLLINS CITY COUNCIL
SUBJECT FOR DISCUSSION
Canal Importation Ponds and Outfall Project.
GENERAL DIRECTION SOUGHT AND SPECIFIC QUESTIONS TO BE ANSWERED
The purpose of this work session item is to provide Council with information on the Canal
Importation Ponds and Outfall (CIPO) drainage improvement project.
BACKGROUND
Staff is ready to begin design of the CIPO drainage improvement project. This project will impact
several neighborhoods in west/central Fort Collins in different ways. 'These impacts will generally
be excavation of new and existing detention areas,construction of large diameter pipelines in public
right-of-way and construction/restoration in the Red Fox Meadows Natural/Storm Water Detention
Area. As staff begins public outreach and design of this project, Council will likely receive
questions from citizens.
Definition of the Problem
According to the Colorado Climate Center and the U.S. Geological Survey, on average, there are
about 150 100-year rainfall events in Colorado every year. At any given location, there is a 1%
chance of 100-year storm in any given year. According to the Colorado Water Conservation Board,
that means that over the life of a typical 30-year mortgage,a property in the 100-year floodplain has
a 26% chance of experiencing a 100-year flood and only a 1-2% chance of a fire.
The Canal Importation Drainage Basin spans nearly five square miles in west-central Fort Collins.
Three major irrigation canals traverse the basin from north to south and impact drainage in the basin.
The canals intercept runoff traveling through the basin and transport it out of the basin,and they also
spill runoff into the basin when their capacity is exceeded. Drainage patterns in this basin are
extremely complicated. During storms, water from as far west as the foothills flows into the three
irrigation canals until they fill up and spill where the banks are low. Floodwaters travel east until
they reach the Colorado State University campus and Old Town area, and eventually the Poudre
River.
The basin has experienced flooding many times due to its urbanized nature and because development
took place with little or no detention. Existing storm sewers are sized for very small rainfall events,
sometimes less that a 2-year storm. Additionally, the loss of the natural drainage channels due to
fanning and urbanization assure future flooding potential.
March 13, 2007 Page 2
In September, 1938, over four and a half inches of rain fell in 48 hours west of town and caused
widespread damage. More flooding occurred in August 1951, when over six inches of rain fell in
27 hours,with slightly more than one inch falling in 15 minutes. Runoff caused the irrigation canals
to overflow, with the water flooding the Colorado A&M college campus. During the morning of
August 13, 1974,the basin received nearly four inches of rain. The hardest hit area was near Avery
Park. In 1992, two and a half inches of rain fell in little over an hour. Twenty-five houses in the
basin reported damages, including both basements and main floors. Flooding in July 1997 caused
significant damage throughout the Canal Importation Basin. CSU suffered$100 million in damages
to buildings and property in the worst flooding ever seen in the area. A stone in April 1999 also
caused some minor flooding damage to homes in the basin. It does not take a large storm to cause
flooding in this basin. The regulatory 100-year floodplain for a portion of the Canal Importation
Basin is shown on Attachment 1.
Council Policy Direction
The City's Natural Areas, Stone Drainage, and Water Quality programs have a strong record of
collaboration in the joint acquisition of land and the design ofprojects that meet multiple community
needs. The following guidance provided by City Council indicates how the programs overlap and
therefore must collaborate.
City Code Section 26-492 states that in addition to protecting the health,safety,property,and welfare
of the city, the purpose of the Stormwater Program includes pollution reduction and enhancement
of the environment. City Council Resolution 2004-092 adopted the mission of the Natural Areas
Program;to protect and enhance natural areas and habitats while providing education and recreation.
City Council Resolution 1995-014 directs stormwater staff to view watersheds holistically,protect
habitat, establish stormwater treatment criteria, and establish a program of pollution prevention
education. City Council Resolution 2001-094, The Natural Areas Easement Policy states,
"To the maximum extent feasible,planning for storm drainage, water quality and
natural areas and open lands acquisitions shall continue to be coordinated so that
lands needed for all of these uses are purchased jointly.
Innovative approaches shall continue to be used so that flood control and water
quality facilities are designed, constructed and managed to maintain or enhance
natural area protection values while meeting flood control, stream stability and
water quality needs. "
For these reasons, the Stormwater Program and Natural Areas Program jointly purchased the Red
Fox Meadows Natural/Stormwater Detention Area over the last 16 years. The Natural Areas
Program delayed establishing a vision or making significant enhancements in this area until the
Stormwater Program determined its needs. Stormwater and Natural Areas are collaborating to
ensure the project meets the needs and concerns of both.
Approach to the Problem
City staff has assembled a strong team to tackle the public outreach,design and construction of the
CIPO Project. The project managers will be leading a team of stormwater and natural areas staff,
March 13, 2007 Page 3
design consultants,specialty consultants,communications specialists,and a contractor with aproven
performance record and customer service attitude.
The project team is focused on the importance of keeping citizens informed and involved in plans
for final design and construction. As a group,including Utilities and Natural Areas,staffhas worked
hard to develop a good understanding of the proposed project area and its current uses,including its
role in stormwater detention and as a neighborhood natural area.
Canal Importation Basin Stormwater Master Plan
The Canal Importation Basin stormwater master plan was adopted by City Council in 2001 and
reaffirmed in the City-Wide Stormwater Master Plan, adopted in 2004. The master plan called for
$51.5 million in flood control improvements in order to avoid an estimated $125 million of direct
flood damage over the next 50 years. Included in the master plan are improvements to stream habitat
and riparian vegetation,enhancing or expanding wetland areas,maintaining and connecting wildlife
travel corridors and incorporating water quality. To date $15.3 million of the estimated $51.5
million in capital projects have been completed, for an actual cost of$9.8 million. The master plan
estimate of the CIPO Project is $21.5 million. After completion of the CIPO Project, there will be
$14.7 million in remaining projects in this basin.
The master plan considered and evaluated over 60 alternatives for detention and conveyance in the
Canal Importation Basin. In general, these alternatives were considered: (1) level of protection—
providing 100-year flood protection throughout the basin versus providing a lower level of flood
protection;(2)balancing detention and conveyance requirements—maximizing regional and on-site
detention within the basin versus providing less detention along with larger conveyance facilities;
and (3) protecting and enhancing habitat areas. Seven specific criteria were considered for
evaluating the conceptual alternatives; these criteria were as follows:
(1) provide flood protection for homes and buildings;
(2) reduce flood hazards along streets and road crossings;
(3) minimize the exportation of runoff to downstream drainage basins;
(4) minimize adverse impacts to existing habitat areas;
(5) enhance/expand habitat areas and water quality opportunities;
(6) cost of improvements;
(7) maintenance requirements.
After each successive round of evaluation, more detail was added to the remaining alternatives.
Based on the evaluation and recommendations made by City Utilities staff,other City departments,
the technical consultant, and other sources, a recommended plan of improvements was selected.
Proposed Conceptual Solution
The CIPO Project is one element of the improvements in the Canal Importation Basin. As such, it
must work in concert with existing and other proposed improvements in the Canal Importation
March 13, 2007 Page 4
Basin. The conceptual design of the CIPO Project, shown on Attachment 2,includes the following
elements:
• Creation of a new detention area at Taft Hill Road and Glenmoor Drive,
• Modification to the outlet structure at the existing Plum Detention Area, at Skyline and
Elizabeth,
• Expansion of the Avery Park Pond and modification of its outlet structure,
• Expansion of the Fairbrooke Detention Area, southwest corner of Prospect and Taft Hill,
• Relocation of the outdoor classroom in the Fairbrooke Detention Area,
Creation of a new detention area and wetlands, southeast comer of Prospect and Taft Hill
(Kane Detention Area),
• Expansion of the existing Red Fox Meadows Detention Area,
• Creation of water quality areas in Fairbrooke and Red Fox Meadows Detention Areas,
• Approximately 5,000 feet of 24 inch through 102 inch storm sewer pipe and associated
inlets, and
• Restoration and enhancements to Red Fox Meadows Natural/Stormwater Detention Area
Special Considerations for Red Fox Meadows Natural/Stormwater Detention Area
The project team is aware of the interest and sensitivity to the design of the detention areas and
natural area enhancements at Red Fox Meadows. In preparation for public outreach,several design
concepts have been created. An overall design concept diagram is Attachment 3. A conceptual
rendering is Attachment 4. A conceptual slope design concept is Attachment 5. A conceptual
detention area design concept is Attachment 6.
The project team has incorporated the follow design elements into the concept drawings:
• Gentle slopes on the banks of the new Kane detention area and the expanded Red Fox
Meadows detention area,
• Peninsulas and varied bank shapes to provide a natural look,
• A natural, meandering stream to carry low flow runoff and ground water,
• A small pond or riffle areas in the Kane detention area for improved wildlife habitat,
• Irrigation canals in current locations to minimize loss of riparian habitat,
• Removal of the existing flume over the Latimer County No. 2 Canal,
• A minimum of new exposed concrete structures,
• Special treatments and landscaping to buffer necessary structures and minimize potential for
graffiti,
• Removal of Russian olive and small caliber Siberian elm trees,
• Larger caliper Siberian elms removed after collaboration with Natural Areas and Forestry
staff,
• High quality stands of native trees and shrubs preserved where possible,
• Existing fox dens preserved when possible;recreate dens in an isolated area of site when not
possible,
• Native species for re-vegetation,
• Clumps of trees and shrubs throughout newly constructed areas for future wildlife habitat,
• A temporary irrigation system to speed establishment of native grasses, shrubs, and trees,
March 13, 2007 Page 5
• A new gravel parking area along Longworth Road for 8-10 cars and 1-2 busses,
• Educational kiosk, vault toilet, bike rack, trash receptacles near parking lot,
• A rock trail system with access from parking area to Red Fox Meadows Detention Area,
• An access from the south (via Stuart), including pedestrian bridges over irrigation canals,
• A detached slightly meandering sidewalk along the east side of Taft Hill Road,
• A wetlands education area near the parking area for use by school groups, and
• Relocation and enhancement of the outdoor classroom at Fairbrooke detention area.
Public Communication, Education and Outreach
The public communication effort will be extensive and will include staff from the Utilities Customer
Communications Department and Natural Resources. Outreach will begin in March 2007.
The outline for the public communication, education and outreach plan is listed below.
Three areas of focus:
• Project need and benefits
• Construction impacts for businesses and neighborhoods affected by the project
• Natural Area impacts and restoration
Outreach Goals:
• Inform community about the project
• Help gather input for design planning
• Provide ongoing communication support for the project
Education Goals:
• Inform community about how stormwater drainage and water quality work in the
basin
• Provide information about the natural area affected, including habitat, wildlife and
wetlands
• Help interpret how both construction and restoration will impact the existing area
Communication Plan:
• Project newsletter
• Open House(s)
• Neighborhood/HOA presentations
• City Boards and Commissions
• Community/neighborhood tours
• Project phone line
• Targeted mailings and staff outreach when needed
Continuously updated web site
March 13, 2007 Page 6
ATTACHMENTS
1. Existing Canal Importation Floodplain
2. Overall Conceptual Design
3. Red Fox Meadows Conceptual Design
4. Red Fox Meadows Conceptual Rendering
5. Red Fox Meadows Slope Design Concept
6. Red Fox Meadows Detention Area Design Concept
7. PowerPoint Presentation
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Attachment 5
Red Fox Meadow Detention Area Concept
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New Mercer Ditch New Mercer Ditch
Attachment 6
Drainage
C IImprovement
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' PO Project
Canal Importation Ponds & Outfall
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Attachment 7
Drainage
C I PO Improvement
Project
Canal Importation Ponds & Outfall
Definition of the Problem
1
It Really Does Rain
in Fort Collins . . .
• On average , there are 150 100 -year rain events
in Colorado every year .
• At any given location , there is a 1 % chance of a
100 -year storm in any given year .
• Some properties have higher risk due to
smaller , more frequent floods .
3
Over a 30 - Year Mortgage
• 26 % chance of a 100 -year flood on a property
in a floodplain
• 1 -2 % chance of a fire
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Canal Importation Basin
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Major Flow Paths
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Irrigation Canals
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Irrigation Canal Spills
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Existing Canal
Importation Floodplain
F)d66ng Canallmportauon
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Floods in
Canal Importation Basin
1902 — 6 . 8 inches , no damages due to few buildings
1938 — 4 . 5 inches in 48 hours , $ 10 , 000 damage at CSU
1951 — 6 inches in 27 hours , $ 270 , 000 damage
1975 — 4 inches , 25 homes damaged in Avery Park area
1992 — 2 . 5 inches in 2 hours , $466 , 000 damage
1997 — 14 . 5 inches in 31 hours , $ 100 , 000 , 000 damage
1999 — Local flooding
to
5
Contributing Factors
• Historic streams obliterated by irrigation
canals , agriculture and urbanization
• Urbanization without detention
• Discharge into irrigation canals
• Upstream flows not considered
Stormwater system designed for very small
storms
Development by Decades
�J V BOOM 1950
186Qt
19505�
19605
1970s
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Flood Simulation
Constitution Avenue
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Flood . •
Constitution Avenue
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Damage to Vehicles
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Damage to Structures
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Water Overtopping
New Mercer Canal
4
��uth storm% aters from Mercer ditch and West
at Woodbox Condos i_ re- eirq �4e%utfi /irn ,
17
It ' s Not Just the Water . . .
• Raw sewage
• Mold
• Disease
• Flooded arterial and collector streets
• Death
18
9
Other Considerations
• Basin hit hard in 1997
• History of multiple floods , including smaller
storms
• Basements not insurable
• Neighborhood vitality issue
• Economic impact to community
• Improvements postponed for 10 years
, 9
Drainage
Improvement
t
Project
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Canal Importation Ponds & Outfall
A Stormwater and Natural Areas Joint Project
10
Purpose of the
Stormwater Program
City Code Section 26 -492
• Drain and control flood water
• Reduce pollution
• Enhance the environment
• Protect the health , safety , property and
welfare of the city
2 ,
Mission of the
Natural Areas Program
City Council Resolution 2004 - 92
protect and enhance :
• Lands with existing or potential natural area
values . . .
Protection of natural habitats and features while
providing education and recreation
1t
11
Stormwater Watershed Approach
City Council Resolution 1995 - 14
• Pollution prevention education
• Stormwater treatment criteria
• Protection of habitat
• Integrated approach
23
Natural Areas Easement Policy
City Council Resolution 2001 -94
. . . To the maximum extent feasible , planning for
storm drainage , water quality and natural areas
and open land acquisitions shall continue to be
coordinated so that lands needed for all of these
uses are purchased jointly .
2:1
12
Natural Areas Easement Policy
City Council Resolution 2001 -94
. . . Innovative approaches shall continue to be
used so that flood control and water quality
facilities are designed , constructed and managed
to maintain or enhance natural area protection
values while meeting flood control , stream stability
and water quality needs .
25
Drainage
Improvement
J *M/ IPO Project
1
Canal Importation Ponds & Outfall
A Team Approach
to Provide Exceptional Service
for an Exceptional Community
Our "A" Team
JaASSOCIATES
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BHA DESIGN INCORPORATED Cla.t Cntc �-Y.tLrm la .
27
Our Approach to the Problem
Our project team is focused on the
importance of keeping citizens informed and
involved in plans for final design and
construction .
I
Our Approach to the Problem
As a group , including Utilities and Natural
Areas staff , we have worked hard to develop a
good understanding of the proposed project
area and its current uses — including its role in
stormwater detention and as a neighborhood
natural area .
Drainage
Improvement
C
PO Project
Canal Importation Ponds & Outfall
A History of
Successful Collaboration
30
15
Sheldon Lake
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Redwing Marsh Natural Area —
Stormwater Detention Area
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C & S Railroad Detention Area
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Rolland Moore Detention Area
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Locust Street Outfall
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Stormwater Treatment Area
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Spring Creek at Drake Road
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Drainage
C I PO Improvement
Project
Canal Importation Ponds & Outfall
Proposed Conceptual Solution
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19
Canal Importation
Stormwater Master Plan
City Ordinance 121 - 2001
• Adoption of master drainage plan for the
Canal Importation Basin
• $ 51 . 5 million in improvements to avoid
$ 125 million in damages
• Proposes improvements to stream habitat and
riparian vegetation , enhancing or expanding
wetland areas , maintaining and connecting
wildlife travel corridors and incorporating water
quality
z :
Master Plan Status
• Master plan estimate — $ 5115001000 *
• Projects completed — $ 15 , 300 , 000 *
• CIPO estimate — $ 21 , 5001000 *
• Projects remaining — $ 14 , 700 , 000 *
• Actual cost of completed projects — $ 9 , 800 , 000
` 2001 Master Plan estimate dollars , not actual costs
40
20
The CIPO Project
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Project Overview
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Current Floodplain
Existing Canal Importation
Floadplain
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Post Project Goal
CIPO Post Project '
Fboopmin �
44
22
Alternatives Considered
The Canal Importation Master Plan evaluated over
60 detention and conveyance facility alternatives .
In general , alternatives considered included :
• Level of protection ;
• Balancing detention vs . conveyance ; and
• Protecting and enhancing habitat areas .
45
Evaluation Criteria
• Provide flood protection for homes
• Reduce flood hazards along streets
• Minimize the exportation of runoff
• Minimize adverse impacts to existing habitat
• Enhance habitat and water quality opportunities
Cost of improvements
• Maintenance requirements
46
23
Alternatives Considered
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Additional Alternatives
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Impact on Neighborhood —Excavation
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Impact on Neighborhood —
Pipe Laying
max-
25
Impact on Neighborhood —
Red Fox Meadows
Red Fox Meadows Natural Area
�I
Drainage
C I PO Improvement
Project
Canal Importation Ponds & Outfall
History of Red Fox Meadows
52'
26
1950 Aerial Photograph
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53
/ Aerial • •
R " • Fox Meadows
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1956 Aerial Photo
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1969 Aerial Photo
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1985 Aerial Photo
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2005 Aerial Photo
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29
Acquisition History
Red Fox Meadows Natural Area
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Acquisition — 1975
t875
I DO`'t SW Fox Meadows Natural Area Red a
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Acquisition — 1984
I CAN
!ao% sW IV$
SW Red Fox Meadows NaWral Area
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Acquisition — 1991
1W
'00% SW 1975
100% SW Red Fox Meadows Natural Area
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11q� SW
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31
Acquisition — 1992
�rrroren rr.
190a
100% Sw 1975
100% Cw Red Fox Meadows Natural Area
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1902
iB81 90% ra
10% SW
IWM S1N
Acquisition — 1995
1954
100% SIN 1975
t00% SW Red Fox Meadows Natural Area
i
1992
1W1 W% NA
IO% 9W
1 Ww 5tv
64
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Acquisition — 1998
' e LO't: 3w 1975
100% SY7 Red Fox Meadows Natural Area
1999
6511 NA
45% SW
1992
t 9D% KA
eat
o% SW
10D% S4
Acquisition — 2000
1901
100% SW 1975
IW% Sw Red Fox Meadows Natural Area
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! NANA
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Tile ;eel W% MA
W 10% SW
root ti�::
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33
1980 Stormwater Master Plan
F '=
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M
/ SrcDarcd for the C.tr of Fort rouiI3. Colorado
Volume II PRELIMINARY DESIGN REPORT
DIVERSION OF STORM -\VATER RUNOFF
THROUGH IRRIGATION CANALS FROM
MULBERRY STREET TO SPRING CREEK
FORT COLLINS , COLORADO
Drainage
I PO Improvement
Project
Canal Importation Ponds & Outfall
Design Concepts
68
34
Site Concept
4 Concept DDiI
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69
Concept Rendering
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35
Slope Design Concept
Slope Design Concept
Detention Area Design Concept
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Drainage
C I PO Improvement
Project
Canal Importation Ponds & Outfall
Public Communication ,
Education and Outreach
Communication Plan Focus Areas
• Project need and benefits
• Construction impacts for businesses and
neighborhoods affected by project
• Natural area impacts and restoration
74
37
Outreach Goals
• Inform community about the project
• Help gather input for design planning
• Provide ongoing communication support
for the project
75
Education Goals
• Inform community about how stormwater
drainage works in the basin
• Provide information about the natural area
affected , including habitat , wildlife and
wetlands
• Help interpret how both construction and
restoration will impact the existing area
76
38
Communication Plan
• Periodic project newsletter
• Open house( s )
• Neigh borhood / HOA presentations
• Community/ neighborhood tours
• Project phone line
Targeted mailings and staff outreach when
needed
• Continuously updated Web site
77
Drainage
I PO Improvement
Project
Canal Importation Ponds & Outfall
Project Status
39
Project Schedule
• Preliminary design investigations — 2006
• Public outreach — starting March 2007
• Final design — summer 2007
• Construction at Red Fox Meadows —
winter 2007 -2008
• Project completion — 2010
C I PO Drainage
Improvement
1 Project
Canal Importation Ponds & Outfall
Discussion
40