HomeMy WebLinkAboutSIDEWALK FRANCE AVE 57TH TO 58THThe City Council
City of Edina
Petition
Petition Instructions
This petition form is to be used to ask the Edina City Council to consider the following types of improvements:
SIDEWALK
ALLEY PAVING
WATER MAIN
STORM SEWER
PERMANENT STREET SURFACING WITH CURB AND GUTTER
CURB AND GUTTER ONLY
(WITHOUT PERMANENT STREET SURFACING)
SANITARY SEWER
STREET LIGHTING
or another improvement you describe (called OTHER on this form).
You may use another petition form if you wish but the city council may reject such petitions unless they contain
the following infoimation:
1. Type of improvement(s) requested, e.g., SIDEWALK, STORM SEWER, WATER MAIN, ETC.
2. Precise locations(s) of the requested improvements.
3. A statement that all who sign the petition understand that the city council may assess the costs of
these improvements against the properties benefiting from the improvements in amounts
determined by the Council.
4. Printed name of property owner, owner's signature and phone number, and property address.
5. Signature of person circulating the petition.
If you have questions, please call the City Clerk at 952-927-8861 between 8:00 a.m. and 4:30 p.m.
DEBRA MANGEN
CITY CLERK
APRIL 2008
PROPERTY ADDRESS
(PRINTED)
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OWNER'S NAME
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PROPERTY OWNER'S
SIGNATURE
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City of Edina, Minnesota
CITY COUNCIL
4801 West 50th Street • Edina, Minnesota 55424
(952) 927-8861 • (952) 927-7645 FAX • (612) 927-5461 TDD
DAT REC
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PETITION TO THE CITY COUNCIL
SIDEWALK q ALLEY PAVING Ei WATER MAIN
O STORM SEWER
El SANITARY SEWER q STREET LIGHTING
q CURB AND GUTTER ONLY 0 PERMANENT STREET q OTHER:
SURFACING WITH
CURB AND GUTTER
To the Mayor and City Council::
The persons who have signed this petition ask the City Council to consider the improvements listed above to the
locations listed below.
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LOCATION OF IMPROVEMENT BY STREET NAME ADDRESS ADDRESS
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between
and
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and
LOCATION OF IMPROVEMENT BY STREET NAME ADDRESS ADDRESS
LOCATION OF IMPROVEMENT BY STREET NAME ADDRESS ADDRESS
LOCATION OF IMPROVEMENT BY STREET NAME
ADDRESS
ADDRESS
IMPORTANT NOTE: THE PERSONS WHO HAVE SIGNED THIS PETITION UNDERSTAND
THAT THE CITY COUNCIL MAY ASSESS THE COSTS OF THESE IMPROVEMENTS AGAINST
THE PROPERTIES BENEFITING FROM THE IMPROVEMENTS IN AMOUNTS DETERMINED
BY THE COUNCIL AS AUTHORIZED BY CHAPTER 429, MINNESOTA STATUTES.
This petition as circulated by:
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CO-V7-5gV
NAME ADDRESS PHONE
There is space for more signatures on the back.
APRIL 2008
PROPERTY ADDRESS
(PRINTED)
51 2-1 Fa_AN CA A
rt; tfCe
This petition was circulated by:
NAME
The Minnesota Data Practices Act requires that we inform you of your rights about the private data we are requesting on this form.
Under the law, your telephone number is private data. This petition when submitted will become public information. There is no
consequence for refusing to supply this information.
You may attach extra pages with signatures.
APRIL 2008
PROPERTY OWNER'S OWNER'S NAME
GNATURE (PRINTED)
ADDRESS PHONE
resourceful. naturally. BARR engineering and environmental consultants
Technical Memorandum
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
c: Drew McGovern and Kristy Morter (Hennepin County)
1.0 Introduction
Along France Avenue, just south of Wood End Drive and West 57th Street, there is a low area in the
topography which extends from France Avenue to the backyards of the properties on the east side of
France Avenue. This low area is subject to flooding even during relatively small rain events. Additionally,
this low area along France Avenue can overflow to the west down Wood End Drive where there is another
low area drained by four catch basins. This area has also been subject to flooding during relatively small
rain events. Multiple residents, particularly those on the east side of France Avenue, have reported these
flooding concerns to City of Edina (City) staff in recent years.
The City and Hennepin County (County) have been actively working to address this known flooding issue.
This technical memorandum is intended to briefly describe the issues that have been identified by the
City, County, and residents, and also describe possible short- and long-term solutions.
2.0 Identified Issues
Multiple issues have been identified through investigation of the storm sewer system in this area. The
following sections discuss the data provided by a resident and data provided by the County.
2.1 Resident Data
The resident at 3811 West 57th Street provided data to the City via videos and pictures taken during
recent rainfall events that has been invaluable for helping understand the problem and the impacts in this
area. For example, a rain event on September 20th totaled about 3 to 4 inches over 24 hours in this area
(Figure 1). The resident captured video during a high intensity portion of the rainfall event where 0.6
inches fell in about 5 minutes, which is approximately an intensity that has only a 10% chance of occurring
each year. While the overall depth of the event over 24 hours was not very significant, the brief and high
intensity was similar to what we would expect from a 10-year event and the intensity can make it difficult
for catch basins to drain roads quickly.
Barr Engineering Co. 4300 Market Pointe Drive, Suite 200, Minneapolis, MN 55435 952.832.2600 www.barr.com
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Figure 1 Map of total rainfall over 24 hours from September 20th to September 21st, 2018 (MN
State Climatology Office)
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—
5717 France Ave. S
West 57° Street
3811 57" St. W
5705 France Ave. S
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 2
Based on the video that was provided, water was observed to be flowing west along West 57th Street
towards France Avenue, as expected based on topography. The two catch basins along West 57th Street
appeared to be largely ineffective, potentially due to the silt bags that are temporarily installed in the
catch basins due to nearby home construction (Figure 2). Therefore, much of the flow generated from
West 57th Street was bypassing the catch basins and flowing south along France Avenue.
Figure 2 West 57th Street catch basin (image capture from video) and location circled in red
on the image to the right.
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West 57'h Street
3812 57'h
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3811 571h St. W
5705 France Ave. S
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To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 3
The water in the northbound lane of France Avenue that was flowing south largely exceeded the capacity
of the catch basin near 3811 West 57th Street, and water continued to flow south to the next, lowest inlet
(Figure 3). This grated inlet at 5709 France Avenue was completely submerged and a vortex was
occasionally observed indicating at least intermittent flow into the storm sewer system at this location.
Additionally, the entire width of France Avenue was under water in this area, including the road centerline,
suggesting that the water level was up to at least 871.2 feet and likely a few inches higher.
Figure 3 France Avenue catch basin (image capture from video) and location circled in red
on the image to the right.
The video footage also captured flooding conditions in the backyards east of France Avenue and south of
57th Street. There is an inlet behind the home at 5709 France Avenue with a rim elevation of 869.4 feet.
This inlet is connected to the main storm sewer line along France Avenue. Water was observed bubbling
up through this inlet into (and filling) the backyards east of France Avenue (Figure 4). Given the water level
in France Avenue, it is possible that the water coming out of the inlet may have been flowing back
through the pipe from France Avenue, adding to the amount of flood water in the backyards. It is also
possible that this water was coming from the east (from within the upstream storm sewer), but with flow
through the pipes restricted by the flooding on France Avenue, the water from the east (Ewing Avenue
storm sewer) bubbled up to the surface.
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 4
SI
0
3812 57.
St. W
West Sr, Street
4000 Wood
End Dr.
381157^ St. W
5705 France Ave. S
5709 France Ave. S
5717 France Ave.
4001 Wood
End Dr.
Figure 4 Backyard inlet bubbling water (image capture from video) and location circled in
red on the image to the right.
During this storm event, the resident also observed a significant amount of stormwater flowing north from
the inundation at the low area along France and westward to Wood End Drive. Water was pooled in the
low area along Wood End Drive up to an elevation of about 869.5 feet (roughly estimated based on LiDAR
elevation data and video). This is equivalent to over one foot of water in many places, and up to 1.5 feet
of water near the four catch basins along Wood End Drive. In the video, the four catch basins were not
visible due to the depth of water, but it does not appear that water was flowing quickly into the catch
basins. This restriction could be due to temporary silt bags in the catch basins (Figure 5) which are in place
for the purpose of catching sediment from construction upstream along Wood End Drive.
Figure 5 Google Street View image of Wood End Drive catch basins
pipe hydraulic grade
line —with sediment
ow
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pipe hydraulic grade
line —without sediment
sediment build-up
downstream most pipe
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 5
The videos provided suggest that there are inlet capacity issues both along France Avenue where the
catch basins are intended to drain water as it flows both north and south to the low area, and along Wood
End Drive where the catch basins are intended to drain water from the road surface to Minnehaha Creek.
The inlet capacity issues may be driven by either the presence of the silt bags, the number of catch basins,
or both.
2.2 Hennepin County Data
Hennepin County staff investigated the storm sewer pipes north of West 57th Street along France Avenue
and up to the discharge point to Minnehaha Creek. The trunk system in this area includes a 235 foot, 15-
inch reinforced concrete pipe (RCP), followed by a shorter 15-inch plastic pipe that discharges to the
creek. There were two issues found during this investigation. First, in the catch basin manhole where these
two pipes meet, the invert (controlling elevation) of the downstream plastic pipe was nearly 2 feet higher
than the invert of the upstream RCP. Figure 6 shows a longitudinal profile of the storm sewer system
under France Avenue (flowing from right to left, with the left side being north). This elevation difference
significantly reduces the efficiency of the storm sewer system at passing flow. When the longer RCP is
clean and open, it will always be flowing full, which is less efficient than a pipe that is not flowing full.
Additionally, the downstream-most 15-inch pipe with the elevated inverts will have less pressure driving
flow through the pipes. This will further reduce the efficiency or capacity of the storm sewer to pass flow.
Figure 6 Longitudinal profile of the storm sewer system with pipes that are not aligned
Second, because the downstream plastic pipe invert is nearly 2 feet higher than the upstream RCP,
sediment had deposited and collected in this longer RCP, further reducing the conveyance capacity of this Elevation, feet (NGVD29) 875
870
865
860
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 6
pipe. Hennepin County jetted and vacuumed out the sediment from this pipe and removed two
truckloads of sediment.
3.0 Potential Improvement Options
We considered several potential improvement options that can be implemented to help solve, or at least
improve, the flooding issue in this area. Some options are immediate or short-term and have already been
completed or can be completed soon. Others are longer-term solutions and can be implemented in the
years to come. These short-term options are expected to provide some improvement, but not significant
improvement on the peak flood elevations. The City's stormwater model was used as a tool to
demonstrate and quantify the benefits that each of these options provides during the 10-year, 24-hour
storm event. This event was chosen because of the readily available boundary conditions required, and
because of the ability to compare this storm to the recent event in September, 2018. The improvement
options are discussed in the next section.
3.1 Short-Term Options
Three short-term improvement options were considered:
• Increased inspection/maintenance frequency to keep pipe sediment free
• Removal of catch basin sediment control silt bags
• Review Wood End Dr system for condition
The first short-term improvement option is to clean out the sediment in the pipe and restore flow capacity
(maintenance). This has already been completed by Hennepin County. This option was evaluated with the
City's stormwater model by running two model simulations — (1) representing a condition of the pipe half
full of sediment and (2) representing a "clean" pipe (free of sediment). During a 10-year, 24-hour storm
event (design event from NOAA Atlas 14 simulating 4.3 inches of rainfall over a 24-hour period) this
short-term maintenance option reduces peak flood elevations as follows:
• The peak flood elevation in the low area along France Avenue is not affected.
• , The peak flood elevation in the backyards east of France Avenue is not affected.
• The peak flood elevation in the low area along Wood End Drive is decreased by 0.1 feet.
While the removal of the sediment may reduce flooding during events smaller than the 10-year event, in
this particular case, the removal of the sediment has more of an impact on flooding duration, rather than
the peak flood elevation. The removal of the sediment shortens the duration because the system can
ultimately drain more quickly; the peak elevations are less affected largely because of (1) the limited inlet
capacity in the roads and (2) the high inverts of the downstream-most pipe. For example, the flooding
duration in France Avenue during the 10-year, 24-hour storm event is reduced from about 9 hours to
about 4 hours by conducting the pipe maintenance.
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 7
In addition to the removal of the built up sediment (which has already been completed), the second
short-term option is to remove the silt bags at the catch basins in this area, along Wood End Drive and
West 57th Street. This solution was also evaluated with the City's stormwater model by running two model
simulations — (1) representing a condition of almost no inlet capacity at these catch basins and (2)
restored inlet capacity. During a 10-year, 24-hour storm event this short-term maintenance option
reduces peak flood elevations as follows:
• The peak flood elevation in the low area along France Avenue is not affected.
• The peak flood elevation in the backyards east of France Avenue is not affected.
• The peak flood elevation in the low area along Wood End Drive is decreased by 0.2 feet, relative
to the base condition (silt bags and sediment).
The third short-term option is to inspect the catch basins, pipes, and the treatment structure manhole at
the low point along Wood End Drive. This inspection option has not been performed but may identify
restrictions in the storm sewer system that are currently unknown. Additional short-term options may also
be identified as a result of this inspection.
3.2 Long-Term Options
We considered five long-term options, in addition to the short-term options described in Section 3.1,
which could help solve or at least improve the flooding issue at this location. Any of these individual
options, or any combination of these options, could be implemented in the future as opportunities arise.
Performance for each option was reviewed for the following criteria and is reported in the
recommendations summary table below (Table 1).
• Reduction of peak flood elevation along France Avenue (MHS_1)
• Reduction of peak flood elevation in rear yards (MHS_74)
• Reduction of peak flood elevation on Wood End Drive (MHC_4, un-delineated)
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 8
Table 1 Summary of long-term improvement options and the incremental reductions in the
peak flood elevations for the 10-year, 24-hour storm event
Condition Flood Elevation
(France Avenue,
MHS_1)
Flood Elevation
(Rear Yards,
MHS_74)
Flood Elevation
(Wood End Drive,
MHC_4)
Existing (Base) Condition 871.0 872.3 870.9
Long Term Improvement Option Flood Elevation
Reduction (France
Avenue, MHS_1)
Flood Elevation
Reduction (Rear
Yards, MHS_74)
Flood Elevation
Reduction (Wood
End Drive, MHC_4)
Option 1 - lower inverts and increase
capacity, Section 3.2.1, recommended
0.2 feet 1.7 feet 1.0 feet
Option 2 - Option 1 plus additional France
Ave. inlet capacity, Section 3.2.2,
recommended
Option 1 + 0.8 feet Option 1 - 0.2 feet Option 1 + 0.3 feet
Option 3 - Option 2 plus additional Wood
End Dr. inlet and pipe capacity, Section 3.2.3,
recommended pending review
Option 2 + 0.0 feet Option 2 + 0.0 feet Option 2 + 1.5 feet
Option 4a - Option 1 plus diverting Ewing
Ave., Section 3.2.4, recommended if not 4b
Option 1 + 0.0 feet Option 1 + 0.2 feet Option 1 + 0.0 feet
Option 4b - Option 2 plus diverting Ewing
Ave., briefly discussed in Section 3.2.4,
recommended
Option 2 + 0.2 feet Option 2 + 0.4 feet Option 2 + 0.0 feet
Option 5 - Backflow preventers, not
recommended
0.0 feet 0.0 feet 0.0 feet
3.2.1 Lower Pipe Invert to Increase Capacity of France Avenue System
The first long-term option is to lower the invert of the downstream-most pipe, and increase the size of the
storm sewer system under France Avenue to 36-inch pipes (Figure 7). During a 10-year, 24-hour storm
event (design event from NOAA Atlas 14 simulating 4.3 inches of rainfall over a 24-hour period) this
improvement option reduces peak flood elevations as follows:
• The peak flood elevation in the low area along France Avenue is decreased by 0.2 feet, from 871.0
feet in the base condition to 870.8 feet. With this change, there would still be significant flooding
on France Avenue, albeit for a much shorter duration.
• The peak flood elevation in the backyards east of France Avenue is decreased by 1.7 feet, from
872.3 feet in the base condition to 870.6 feet. Based on the 2011 LiDAR data, this appears to
remove all impacts to homes along France Avenue and 57th Street from the backyard area.
• The peak flood elevation in the low area along Wood End Drive is decreased by 1.0 feet, from
870.9 feet in the base condition to 869.9 feet. This is an improvement, but there would still be
substantial flooding on Wood End Drive.
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To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 9
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Figure 7 First proposed long-term improvement option —*ncreasing capacity of France
Avenue storm sewer system and lowering downstream-most pipe invert
3.2.2 Additional catch basins in the low point on France Avenue
In addition to the first long-term option described in Section 3.2.1, the second long-term option
considered is the addition of three catch basins in the low point on France Avenue (and connection to the
larger (36-inch) France Avenue system (Figure 8). During a 10-year, 24-hour storm event (design event
from NOAA Atlas 14 simulating 4.3 inches of rainfall over a 24-hour period) this improvement option
reduces peak flood elevations as follows:
• The peak flood elevation in the low area along France Avenue is decreased by 1.0 feet, from 871.0
feet in the base condition to 870.0 feet. With this change, there would be no flooding along
France Avenue.
• The peak flood elevation in the backyards east of France Avenue is decreased by 1.5 feet, from
872.3 feet in the base condition to 870.8 feet. This improvement is not as good as long-term
option 1 alone, because of the additional water that is allowed to enter the system along France
lower inverts
of this pipe
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To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 10
Avenue, thus restricting drainage from the backyards. However, homes still appear to be not
impacted from the backyard at this elevation based on LiDAR data.
• The peak flood elevation in the low area along Wood End Drive is decreased by 1.3 feet, from
870.9 feet in the base condition to 869.6 feet. This is a greater improvement, because there is now
no flow coming from France Avenue into Wood End Drive. However, the front yards of two
properties are inundated.
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Figure 8 Second proposed long-term improvement option — increasing capacity of France
Avenue storm sewer system, lowering invert of downstream-most pipe, and adding three catch
basins along France Avenue
3.2.3 Additional catch basins in the low point on Wood End Drive, and larger 18-inch
pipes to Minnehaha Creek
In addition to the second long-term option described in Section 3.2.2, the third long-term option is to add
two catch basins at the low point on Wood End Drive and increase the pipe sizes (to 18-inch) to
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 11
Minnehaha Creek (Figure 9). During a 10-year, 24-hour storm event (design event from NOAA Atlas 14
simulating 4.3 inches of rainfall over a 24-hour period) this improvement option reduces peak flood
elevations as follows:
• The peak flood elevation in the low area along France Avenue is decreased by 1.0 feet, from 871.0
feet in the base condition to 870.0 feet. With this change, there would be no flooding along
France Avenue. The option described in this section provides no additional benefit to the low area
along France Avenue that is not already provided by the option described in Section 3.2.2.
• The peak flood elevation in the backyards east of France Avenue is decreased by 1.5 feet, from
872.3 feet in the base condition to 870.8 feet. The option described in this section provides no
additional benefit to the backyards east of France Avenue that is not already provided by the
option described in Section 3.2.2.
• The peak flood elevation in the low area along Wood End Drive is decreased by 2.8 feet, from
870.9 feet in the base condition to 868.1 feet. With this change, there would be no flooding on
Wood End Drive. This option provides greater benefit to the low area along Wood End Drive than
the options described in Sections 3.2.1 and 3.2.2.
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To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 12
ID C
WOODLAND OR
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increase pipe
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Figure 9 Third proposed long-term improvement option — increasing capacity of France
Avenue storm sewer system, lowering invert of downstream-most pipe, adding three catch
basins along France Avenue, adding two catch basins on Wood End Drive, and increasing pipe
size from Wood End Drive to Minnehaha Creek
3.2.4 Diverting water from Ewing Avenue
In the base condition, restricted flow capacity in the France Avenue storm sewer system limits outflow
from the low backyard area east of France Avenue. Additionally, this capacity limitation forces water from
Ewing Avenue to surcharge from the storm sewer system, bubbling out at the surface in the backyards.
Diverting water from Ewing Avenue could provide additional benefit to the backyard areas. In addition to
the first long-term option described in Section 3.2.1, the fourth long-term option is to abandon the
existing pipe draining Ewing Avenue towards France Avenue, and install a new 18-inch pipe from Ewing
Avenue north to 57th Street (Figure 10). During a 10-year, 24-hour storm event (design event from NOAA
Atlas 14 simulating 4.3 inches of rainfall over a 24-hour period) this long-term improvement option
reduces peak flood elevations as follows:
,11.1 fen4a AKS add three
catch basins
1_
5711 L..
I L.
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 13
• The peak flood elevation in the low area along France Avenue is decreased by 0.2 feet, from 871.0
feet in the base model to 870.8 feet. With this change, there would still be significant flooding on
France Avenue, albeit for a much shorter duration. If the three additional catch basins were
included in this option, such as described in Section 3.2.2, the peak flood elevation would be
reduced to 869.8 feet, a 1.2 foot reduction from the base condition.
• The peak flood elevation in the backyards east of France Avenue is decreased by 1.9 feet, from
872.3 feet in the base condition to 870.4 feet. This appears to remove all impacts to homes along
France Avenue and 57th Street from the backyard area based on LiDAR, and is an improvement in
this area over long-term options 1 through 3.
• The peak flood elevation in the low area along Wood End Drive is decreased by 1.0 feet, from
870.9 feet in the base condition to 869.9 feet. This is an improvement, but there would still be
substantial flooding on Wood End Drive. The additional catch basins and increased pipe sizes that
are described in Section 3.2.3 would prevent the flooding at Wood End Drive.
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To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 14
Figure 10 Fourth proposed long-term improvement option — increasing capacity of France
Avenue storm sewer system, lowering invert of downstream-most pipe, abandoning the existing
pipe from Ewing Avenue to the west, and adding new 18-inch pipe to divert stormwater from
Ewing Avenue
3.2.5 Backflow preventers between France Avenue and the backyards to the east
There was initially some suspicion that the flow bubbling up from the storm sewer system in the
backyards (described in Section 2.1, and Figure 4) was coming from France Avenue flooding. However,
further analysis indicates that the surcharging will continue to occur in the backyard area if backflow
preventers are installed due to the limited flow capacity in the France Avenue system and incoming
stormwater flows from the Ewing Avenue storm sewer system. Therefore, we do not recommend installing
backflow preventers in the existing pipes between France Avenue and the backyards (Figure 11).
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To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 15
Figure 11 Fifth proposed long-term improvement option — backflow preventers between France
Avenue and the backyards east of France Avenue (not recommended).
4.0 Conclusions
The area around the intersection of France Avenue and West 57th Street experiences flooding, even during
relatively small rain events. There are short-term and long-term improvement options that can be
implemented to reduce both the peak flood elevations and flood durations.
In the short term, Hennepin County has already removed sediment that was restricting flow capacity of
the storm sewer system under France Avenue. The City could also remove the temporary silt bags from
the catch basins on West 57th Street and Wood End Drive, although the flooding benefit from this would
be marginal. The relationship between sediment controls and flooding is rather complex. The temporary
inlet protection (silt bags) can exacerbate flood elevations due to reduced inlet capacity. However, without
silt bags, the sediment that accumulates in the pipe can also exacerbate flood elevations in the long term
due to reduced pipe capacity (until periodic maintenance occurs).
In the long term, we recommend that the city consider lowering the upstream invert of the downstream-
most pipe under France Avenue, increasing the pipe size along France Avenue to 36-inch pipes, and
installing additional catch basins to the low points on both France Avenue and Wood End Drive.
To: Ross Bintner
From: Cory Anderson and Sarah Stratton
Subject: Stormwater Issues and Findings at West 57th Street and France Avenue
Date: January 3, 2019
Page: 16
Additional reductions in the flood elevations in the backyard area could be achieved by diverting flow
from Ewing Avenue north to West 57th Street.
Please let us know if you have questions about the data, the analysis, or the conclusions as you are
reviewing this technical memorandum. If so, please contact Cory Anderson, PE, at 952-832-2872 or at
canderson@barr.com.
You're West 58th Street Reconstruction Invited:
Oper,House
c
c
oA
Pamela
Park
Tell us your experience on West 58th Street from Wooddale Avenue to Xerxes Avenue.
Edina would like to design a solution for your transportation challenges.
Join us at an open house Monday February 25, 2019 from 6 - 8 p.m.
at the Public Works Building, 7450 Metro Blvd, Edina.
• le
Better
Together
Unable to Attend?
Participate online at www.BetterTogetherEdina.org to start the conversation, provide ideas, sign-up for email
updates, sign-up to participate in a project focus group, and stay ur*,4-' i West 58th Street progress.
0
•
West 58th Street Reconstruction
— Open House
You're
Invited
Monday, February 25, 2019
6 — 8 p.m.
Public Works Building
7450 Metro Blvd
Edina, MN 55424
For more information visit:
www.BetterTogetherEdina.org
PRSRT STD
US POSTAGE
PAID
TWIN CITIES MN
PERMIT 30308
*********************ECRWSS"C 006
Terri E Matavovsky
Or Current Resident
3811 W 57th St
Edina MN 55410-2370
1 69
W 58th St
O S any So ueJd SAV el Epp OOM West 58th Street
Reconstruction
Participate online at www.BetterTogetherEdina.com to start the conversation, provide ideas, sign-up for email updates,
sign-up to pariticpate in a project focus group, and stay up-to-date on West 58th Street progress.
- —
Better Together
EDINA
All paved streets have a limited life-cycle and will require reconstruction. Reconstruction is required when normal maintenance like
pothole patching is no longer effective. Reconstruction is an opportunity for the residents to consult Edina on the needs for the corridor.
Reconstruction may allow for changing the street width, installing new pedestrian facilities, upgrading bike lanes, and a variety of other
options. Changes to the existing roadway design will take into account residents feedback. You are invited to provide feedback and
help Edina determine needs along West 58th Street.
Project Development Process Timeline
EIE,E
IE.ERE
MAY Ut APR' FEBRUARY MARCH APRIL
c12 a a
Final Des1211111
Construction Open House Design Alternatives Development
Feedback
• Identify • Resident and Stakeholder Focus Group discussions • Opportunity • Provide feedback
resident needs to provide feedback on alternatives. for feedback on for final design
— Sign-up for a focus group. initial design adjustments
— Comments are accepted online