05-22-17 CC WS Agenda CITY OF SHOREWOOD 5755 COUNTRY CLUB ROAD
CITY COUNCIL WORK SESSION COUNCIL CHAMBERS
MONDAY, MAY 22, 2017 6:00 P.M.
AGENDA
1. CONVENE CITY COUNCIL WORK SESSION
A. Roll Call
Mayor Zerby
Johnson
Labadie
Siakel
Sundberg
B. Review Agenda
ATTACHMENTS
2. STORMWATER DRAINAGE/FREEMAN PARK Engineer's memo
3. PARKS COMMISSION VACANCY INTERVIEWS:
a. NATHANIAL GORHAM—6:30
b. HOLLY ASHMORE—6:45
4. ADJOURN
#2
MEETING TYPE
City of Shorewood Council Meeting Item Work Session
..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Title/Subject: Freeman Park Area Drainage Study Discussion
Meeting Date: May 22, 2017
Prepared by: Paul Hornby, City Engineer
Reviewed by:
Attachments: Freeman Park Feasibility Study(DRAFT)
Policy Consideration: Should the City Council consider planning drainage improvements in the Freeman
Park area and downstream?
Background: Since the heavy precipitation events in June 2014,the City has had a number of drainage
concerns in the Freeman Park area. The City has authorized staff to review the drainage in the Freeman
Park area. The drainage area has expanded due to the number of drainage concerns brought to staff
and generally covers the area bounded by Eureka Road, Cathcart Drive,TH 7 and Smithtown Road.
The study was initiated after the City received resident concerns after the June 2014 rainfall events.
Expansion of the study to include Strawberry Lane was needed to meet the Capital Improvement Plan
funding schedule for Strawberry Lane reconstruction and trail. The study also discusses the downstream
effects of this drainage area along Grant Lorenz Road due to significant erosion that has occurred to the
Grant Lorenz Road drainage channel.
Staff has prepared the draft report and does recommend the final report become part of the
comprehensive plan update.
Recommendation/Action Requested: Staff requests that Council review the report and have
discussion about the potential improvements at the work session. Staff will need to refine costs
indicated in the draft report and will tabulate options in a manner for capital improvement planning.
Mission Statement: The City of Shorewood is committed to providing residents quality public services, a
healthy environment, a variety of attractive amenities, a sustainable tax base, and sound financial
management through effective, efficient, and visionary leadership. Page 1
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HYDROLOGIC/HYDRAULIC
ANALYSIS
FREEMAN PARK
FEASIBILITY STUDY
April 5, 2017
Prepared for:
City of Shorewood
5755 Country Club Road
Shorewood, MN 55331
WSB PROJECT NO. 1608-08
WSB
FREEMAN PARK FEASIBILITY STUDY
For:
City of Shorewood
April 5,2017
Prepared By:
WSB &Associates,Inc.
477 Temperance Street
St. Paul,MN 55101
(651) 286-8450
(763) 541-1700 (Fax)
Freeman Park Feasibility Study TITLE PAGE
City of Shorewood,MN
WSB Project No.1608-08
TABLE OF CONTENTS
TITLE PAGE
TABLE OF CONTENTS
1 INTRODUCTION.....................................................................................................................................1
2 SHOREWOOD OAKS ..............................................................................................................................1
3 STRAWBERRY LANE DRAINAGE.............................................................................................................2
3.1 Alternative 1: Route Runoff to Freeman Park ..............................................................................2
3.2 Alternative 2: Route via Smithtown Road to Smithtown Road Retention Pond ..........................2
3.3 Alternative 3: Brockwood Addition Route....................................................................................2
3.4 Alternative 4: Strawberry Gardens Route.....................................................................................3
3.5 Alternative 5: Pebble Brook Existing Channel...............................................................................3
4 GRANT LORENZ ROAD CHANNEL..........................................................................................................3
4.1 Freeman Park Retention/Wetland Creation.................................................................................3
4.2 Smithtown Retention Area ...........................................................................................................4
4.3 Low Flow Bypass—Grant Lorenz Road .........................................................................................5
4.4 Upstream Diversion at Strawberry Gardens Addition..................................................................6
5 ALEXANDER LANE POND.......................................................................................................................7
6 CHURCH ROAD PONDING .....................................................................................................................7
7 SHORT TERM SOLUTIONS .....................................................................................................................7
Freeman Park Feasibility Study TABLE OF CONTENTS
City of Shorewood,MN
WSB Project No.1608-08
1 INTRODUCTION
This report summarizes options identified to address five drainage issues within the Freeman
Park subwatershed(see Figure 1) in the City of Shorewood.
1. Shorewood Oaks Development—Private property flooding due to surcharge of storm
sewer and private draintile connections to City storm sewer.
Suggested Action: Construct backflow preventers and/or disconnect draintile from the
City system.
2. Strawberry Lane—Drainage conveyance issues due to the flat topography.
Suggested Action: Construct storm sewer to utilize the existing drainage and utility
easement located on the Pebble Brook Addition.
3. Channel along Grant Lorenz Road—Water level and erosion issues, driveway and
culvert damage.
Suggested Actions:
- Construct a low flow bypass so the channel will convey the 2-year rainfall event.
Larger storm events would be conveyed via a bypass pipe.
- Construct a pond adjacent to Smithtown Road to reduce downstream flow rates.
- Redirect flow from the existing pond located on the Strawberry Gardens addition to
the west; increase pond size for rate control, if necessary.
4. Alexander Lane Pond—Constant standing water.
Suggested Action: Allow the pond to drain down by connecting to the proposed
Strawberry Lane storm sewer.
5. Church Road Ponding—Water pooling in street and backyards.
Suggested Action: Create an outlet for the water by constructing a ditch to the existing
railroad culvert.
The rest of the memo discusses each drainage issue in more detail.
2 SHOREWOOD OAKS
Residents in the Shorewood Oaks development, located along Shorewood Oaks Drive and Oak
Leaf Trail, have expressed concern with basement flooding after heavy precipitation in June
2014. The flooding is due to private draintile connections to a lateral sewer connecting to the
City's storm sewer. When the storm sewer is at full capacity, the private draintile (foundation
drains) discharge to the storm sewer system. This hydraulic connection results in periodic
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 1
surcharge of the storm sewer during heavy precipitation events, and can backflow into the
draintile system. We recommend the following measures to address these issues within
Shorewood Oaks:
1. Televise City storm sewer in this neighborhood to check condition and for obstructions,
2. Disconnect private draintile as feasible from City storm sewer,
3. Install backflow preventers and disconnect remaining draintile connections, and
4. Reduce downstream flood elevations for heavy precipitation events.
3 STRAWBERRY LANE DRAINAGE
The Strawberry Lane area is prone to standing water adjacent to the roadway due to the flat terrain.
Strawberry Lane is tributary to the channel along Grant Lorenz Road. Five alternatives were evaluated
for providing a piped outlet for the Strawberry Lane to address the existing drainage issue. Each
alternative would require either the expansion of an existing pond or the creation of new pond to provide
rate control.
3.1 Alternative 1: Route Runoff to Freeman Park
Alternative 1 was to divert the Strawberry Lane runoff to an area that already holds stormwater that is
located south of the Lake Minnetonka LRT Regional Trail(see Figure 2). This alternative utilizes an
existing storage area within Freeman Park(city property)for stormwater retention. However,the
elevations indicate that it is not feasible to construct this alternative due to the existing topography. The
low point elevation on Strawberry Lane is approximately 969.5. The lowest storage in the Freeman Park
storage area is 962.0 and approximately 2,400 feet away from the low point on Strawberry Lane. The
storm sewer from Strawberry Lane would be too deep to daylight in the Freeman Park storage area. No
engineer's estimate was evaluated since the alternative isn't feasible.
3.2 Alternative 2: Route via Smithtown Road to Smithtown Road Retention Pond
Alternative 2 routes storm sewer under Smithtown Road to a newly constructed Smithtown Retention
Pond(see Figure 3). The benefit of this alternative is it maintains the existing drainage patterns and the
Smithtown retention pond could be used for water quality treatment and rate control. This alternative
would require reconstructing approximately 600' of Smithtown Road that was recently improved.
The estimated cost for this alternative is$430,000,which includes a 25% contingency.
3.3 Alternative 3: Brockwood Addition Route
Alternative 3 was to direct Strawberry Lane storm sewer to the wetland located to the northwest along a
drainage and utility easement in the Brockwood addition,Cathcart Drive,and Beverly Drive (see Figure
4). This alternative allowed water to be diverted away from an area with an existing drainage issue
(Grant Lorenz channel). The primary drawbacks of this alternative were that it was the longest of all the
alternatives,did not provide an opportunity for water quality or rate control,and would require very deep
construction to adequately drain Strawberry Lane(15-20 feet deep for approximately 1500 feet). An
engineer's estimate was not prepared because the pipe depth for construction would have been
prohibitively expensive.
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 2
3.4 Alternative 4: Strawberry Gardens Route
Alternative 4 is similar to Alternative 3. The proposed storm sewer would be directed to the northwest
wetland along a drainage and utility easement in the Strawberry Gardens addition,Cathcart Drive,and
Afton Road(see Figure 5). This alternative would divert flow away from Grant Lorenz channel. This
alternative would also force the storm sewer to be relatively deep(5-10 feet deep for approximately 1600
feet),be along a long route,and change existing flow patterns. The alternative would require that the
existing pond in the Strawberry Gardens addition to be expanded to provide rate control and water
quality.
The estimated cost for this alternative is$885,000,which includes a 25% contingency.
3.5 Alternative 5: Pebble Brook Existing Channel
Alternative 5 would direct the Strawberry Lane storm sewer to the newly constructed Smithtown
Retention Pond via a drainage easement through the Pebble Brook addition(see Figure 6). This
alternative offers several advantages over the other alternatives: the shortest route,wouldn't require
reconstructing a portion of Smithtown Rd,maintains existing drainage patterns. This option will require
additional stabilization of the channel in the drainage easement.
The estimated cost for this alternative is$242,000,which includes a 25% contingency.
Based on the analysis in this section,Alternative 5 is the most preferred option for improving the drainage
for Strawberry Lane.
4 GRANT LORENZ ROAD CHANNEL
The channel along Grant Lorenz Road begins north of the Lake Minnetonka LRT Regional Trail
and meanders under Smithtown Road, under several driveway culverts on the west side of Grant
Lorenz Road and ends at Noble Avenue (see Figure 7). The channel is approximately 2,000 feet
long and conveys runoff from the entire Freeman Park subwatershed, approximately 300 acres.
Velocities and flows in the channel are as follows:
• For a typical 2-year(2.8-inch)rainfall event,which has a 50%probability of occurring
each year, flows exceed 47 cfs and velocities exceed 5 fps.
• For the 100-year event, flows exceed 220 cfs and the velocity exceeds 11 fps.
The high velocities result in erosion in the channel and frequent sediment transport to the
receiving downstream wetland. Water levels in the channel impact private property during high
flow events,historically overtopping the driveways and destroying several culverts.
Several alternative were evaluated for reducing the peak discharge in the channel to improve
water quality and address high water levels.
4.1 Freeman Park Retention/Wetland Creation
In 2008, WSB completed a wetland enhancement plan for Freeman Park upstream of the outlet
control structure at the Lake Minnetonka LRT Regional Trail. This analysis builds on the
previous work to evaluate the benefit of additional flood storage in the park on downstream
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 3
flooding. The existing outlet is an inverted 18-inch pipe with a large capacity overflow that
conveys runoff from 163 acres.
WSB modeled the downstream impacts of closing the 18-inch pipe and completely storing the
runoff from the 100-year, 24-hour rainfall event behind the trail within Freeman Park. This
scenario only provides minimal benefits because the 18-inch pipe is already limiting the majority
of the runoff from travelling downstream. It only reduces the peak discharge in the channel by 5
cfs for the 100-year event and lowers the high water levels in the channel between 0.0-feet to
0.2-feet.
Additionally, a 48-inch outlet for the Shorewood Oaks development discharges into the Freeman
Park storage area. Any increase in the high water level in Freeman Park negatively impacts the
capacity of the 48-inch pipe. The park high water level creates a tailwater condition that doesn't
allow the 48-inch pipe to discharge until the water level in the park recedes. The high water level
in Freeman Park contributes to the surcharging of the Shorewood Oaks storm sewer and reduces
its capacity.
Due to the limited hydraulic benefit downstream and the potential to exacerbate upstream
flooding,we do not recommend additional retention in Freeman Park. Shorewood staff
recommends reconstructing the existing outlet control structure, as it poses significant and
ongoing maintenance issues for Public Works Staff. The debris and plugging at the outlet
structure impacts the water level in Freeman Park. Redesign of the outlet structure must balance
reducing the high water level in the Shorewood Oaks area without increasing discharge
downstream.
It should be noted that the existing 100-year high water level in Freeman Park is 968.4, which
results in water on the adjacent ballfields.
4.2 Smithtown Retention Area
Approximately 222 acres are tributary to the dual 42-inch culverts crossing under Smithtown
Road. With this option we evaluated providing additional flood storage upstream of Smithtown
Road. Figure 7 generally shows the 2-acre footprint of the proposed pond. The pond provides
8.1 ac-ft of flood storage. This location of the pond was selected for the following reasons:
• It collects runoff both from Freeman Park and areas from the west under Strawberry Lane
• Existing culvert failures prompt the need for work in this area
• The pond would be located upstream of the Grant Lorenz Road channel
Table 1 lists the existing and proposed discharge rates at the proposed Smithtown Road pond:
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 4
Table 1 —Smithtown Road Outflow Comparison
Storm Event Existing Discharge Proposed Discharge
cfs cfs
2-year (2.8") 29.5 28.2
10-year (4.2") 96.5 79
100-year (7.3") 188.9 150
The most significant reduction in peak discharge with the retention at Smithtown Road is for the
100-year rainfall event.
Under existing conditions, the 100-year HWL upstream of Smithtown Road is approximately
956.8,which is 0.2-feet below the adjacent low properties. The pond would reduce the high
water level to 955.8, increasing the freeboard to the adjacent properties.
In addition to hydraulic benefits,retention at Smithtown Road also has water quality benefits.
The 2.0 ac-ft of wet volume removes approximately 20 lb/year of total phosphorus and 63,726
lb/year of total suspended solids that otherwise reaches a downstream wetland and then Lake
Minnetonka.
The approximate cost for constructing a pond upstream of Smithtown Road is $194,500, not
including land acquisition. Costs include 10% for contingencies and 30%indirect costs.
4.3 Low Flow Bypass—Grant Lorenz Road
As shown with Table 1, even with additional flood storage upstream of Smithtown Road, the
discharge in the channel still exceeds the channel capacity. Therefore, we evaluated conveying
the low flows in the channel and bypassing high flows (greater than 2-year) through a large
diameter pipe. The low flow bypass was modeled both with and without retention upstream at
Smithtown Road.
The bypass pipe is shown under Grant Lorenz Road to provide adequate cover and within City
right-of-way. This option also includes:
• Stabilization of the channel
• Lowering the driveway overflows
• Pipe extension at the first driveway north of Smithtown road to collect additional runoff
in the bypass pipe
Grant Lorenz Road is scheduled for a sealcoat in 2019 based on the City's Capital Improvement
Program. Constructing the bypass pipe will require complete excavation and restoration of the
roadway, or reconstruction of the roadway.
Tables 2 and 3 show the existing and proposed discharge and high water levels in the channel.
The channel information was measured in the first section of channel after it crosses under Grant
Lorenz Road near Smithtown Road.
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 5
Table 2—Channel Dischar a Comparison cfs
2- ear 10-year 100-year
Existing Proposed Existing Proposed Existing Proposed
46.7 19.3 105.8 38.9 221.1 75.7
Table 3—Channel High Water Level Comparison
2- ear 10-year 100-year
Existing Proposed Existing Proposed Existing L Proposed
943.5 942.6 946.7 943.3 951.4 1 945.3
As shown in Table 2, the peak discharge in the channel is reduced by approximately 65% for the
100-year event and 59% for the 2-year event. The reduction in peak discharge reduces the high
water level 6.1 feet for the 100-year event.
Both of the options (with and without retention at Smithtown Road)provide similar benefits in
terms of reducing the high water level and peak discharge in the channel. The biggest additional
benefits from providing retention at Smithtown Road is water quality treatment and reduction to
the size of the downstream bypass pipe.
There are also water quality benefits to the proposed low flow bypass. The existing high
velocities in the channel have led to significant erosion. The estimated annual total suspended
sediment load from the channel erosion is 1.4 tons/year,using the Board of Soil and Water
Resources (BWSR) RUSLE calculator. Re-stabilization of the channel would eliminate the
ongoing erosion. The low flow bypass would also provide bio-retention within the channel for
small storm events.
The estimated cost of the bypass option with no retention at Smithtown Road is $725,000 and
$860,000 with retention. Road reconstruction using City Standard Section are approximately an
additional $2,275,000. Costs do not include land acquisition for the Smithtown Road ponding
area and reconstruction of Grant Lorenz Road.
4.4 Upstream Diversion at Strawberry Gardens Addition
Another potential option to reduce flow rates at the Grant Lorenz channel would be divert water
at the existing stormwater pond located on the Strawberry Gardens addition(see Figure 8).
Instead of overflowing from the pond and eventually reaching the Grant Lorenz channel, a
diversion would direct low flow to the wetland located northwest of the existing pond. The pond
could be expanded to provide further rate control and water quality benefits. Table 4 shows the
anticipated reduction in rate and HWL at Grant Lorenz channel if this option were chosen.
Table 4—Change in Rate and HWL at Smithtown Road
Rate cfs HWL
Existing Proposed Existing Proposed
188 160 951.4 955.3
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 6
A negative effect from this option would be that existing drainage patterns would be altered and
flow rates to the wetland would be increased. Therefore, the Minnehaha Creek Watershed
District(MCWD) should be consulted before this option is chosen.
The estimated cost for this improvement is $613,000, which includes a 25% contingency.
5 ALEXANDER LANE POND
A stormwater pond is located in the recent development at Alexander Lane (see Figure 9). The
pond currently does not function as intended with standing water for longer than designed for
large storm events. An outlet pipe could be connected to the proposed storm sewer under
Strawberry Lane to reduce the drawdown time.
The estimated cost for this improvement is $43,000,which includes a 25% contingency.
6 CHURCH ROAD PONDING
Residents report that ponding occurs in yards and on Church Road after large storm events (see
Figure 9). There is currently not a clear outlet for stormwater to leave the area. Ponding could
be reduced by constructing a ditch running southwest parallel to the Lake Minnetonka LRT
Regional Trail towards the existing dual culverts.
The estimated cost for this improvement is $29,000, which includes a 25% contingency.
7 SHORT TERM SOLUTIONS
Due to the significant cost of the bypass pipe along Grant Lorenz Road,several short-term solutions,that
will help reduce erosion and enhance flood control,have been identified.
The following short-term solutions are recommended:
• Shorewood Oaks: Construct backflow preventers and/or disconnect draintile from City system.
Assuming approximately 30 properties are impacted with an estimated cost of$1,500 per
household,the estimated cost is$45,000.
• Smithtown Road Pond: Purchase land adjacent to Smithtown Road for future ponding. Assuming
a cost for land acquisition of$220,000/acre the estimate cost is $440,000 for approximately 2.0
acres of property needed for the pond.
• Strawberry Lane: allocate funds for Alternative 5.
• Upgrade/modify the Freeman Park existing drainage structure,approximate cost$10,000. As
noted previously,it isn't feasible to modify the outlet from Freeman Park without increasing peak
flows downstream. This would need to be reviewed with MCWD. Additional acre-feet of live
storage over the soccer fields in Freeman Park could also be considered,but the grading of
Freeman Park will require additional study if this alternative is pursued.
• Begin discussions with MCWD Staff to determine potential cost sharing alternatives.
Freeman Park Feasibility Study
City of Shorewood,MN
WSB Project No.1608-08 Page 7
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