HomeMy WebLinkAbout2021 10-12 CC WORKSHOP PACKETCity of.Gem Lake, Minnesota -
City Council Workshop, October 12, 2021
Cali to Order of City Council Meeting
By May orArfig-Swomley at 7:_p:m.
Call of Roll
Others In Attendance: Sign=up.Sheet Agenda
New Business
City Council Workshop Agenda. for this Meeting (Accept Agenda)
• Introduction
• Scheuneman Road Storm Water Report Presentation=Emily Jennings, SHE
• Question. and Answer Session
Future Council Meetings
Next City Council Meeting, Tuesday October 19, 2021
Adjournment The meeting :adjourned at
11/2/2021
C i of Gem lake
North Scheuneman Road Surface
Water Management Plan
July 20:. M21
A
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Introduction
• Spring 2019 — Late:winter snow, rain and an
expedited melt
Inundation and Flooding in the Scheuneman
Road Area
• Summer 2020 - Culvert lnspedons
Structural, SedlmentaWn, £roson and
Submerged Conditions
—Generally speaking, culverts were in good shape
— Not evaluated for hydraulics
• Hydraulics evaluation by preparing SWMP
Study Area
• North Scheuneman Road between Highway
61 to Otter Lake Road with the primary areas
of interest located at:
Cross.culvert and ditch system discharging to
39g9 Scheuneman Road ("Culvert -Area")
- Low areas at 3M.and 3924.Scheuneman Road
("South Area")
- Low area 4076 Scheuneman Road
• Receiving Waters
- Golf Course Pond, Gem Lake, Wetlands, Hillary
Farm Lane Pond
- Other Low Areas
1
11/2/202I
Approach
• XPSVVMM 2D
- Numerically and graphically estimate where and to
what depth inundationnay occur during a given
design storm event
- Survey data, LiDAR data, Web Soil Survey
• Design Storm Events
- Worst flooding observed during Spring
— 2-year, 24-hourpreclpitatlan eventon frozen ground
— 10-year, 24-hour precipitation event on frozen grs7und
- "Typical Major Event'.
100 year, 24-hour Precipitation event on non -Frozen
ground (.9%chance of occuning.in any given year)
.5f Ha:aws a e•o�r vraw e. rr e:ir
Existing Conditions
• Peak Inundation and Depth (>0,2 feet)
• Verified drainage issues:. observed: and: as
reported
Culvert Area - Ineffective Flow
• South Area -.Lack of Conveyance
• 4076 Scheunerrtan Road - Lack of
Conveyance
2
11/2/zozl
3
11/2/2021
I
I
11/2/2021
Flood Risk
• For the purpose of the SWIUfP, flood risk is
defined as properties that are wiit.hid 1 foot of
the peak water surface elevations
• Study area is not in a mapped floodpla'in
• Recommended that properties that are at risk
for flooding consider purchasing flood
insurance
SEN
Existing Conditions
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Culvert Area
• Provide Effective Flow
• Two Scenarios
— (.1) U.psize.culvert+and backyard swale.grading
— (2) Upsize culvert and side yardlROW swale
grmding
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South Area
• Provide Discharge
Location
• Three Scenarios
(t).Storm sewer _
System to
natural low area
(2) Storm sewe:
system Id
Hillary Farm Lane
Pond
= (3):Storm sewer
system. to Gem Lake
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11/2/2021
Recommendations
CulvertArea.
Scenario 2 -�-•-
- Red::,,e F'ped Risk
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Recommendations 1
• South Area
5ceriario 2 or 3
2: To Hillary Farm Lane Pond
3. Ta Gem Lake
Scenario 2 requires additional
investigation
— Scenario 3 requires agency
approvals
Similar benefit to flood risk.and
inundation durabon
Similar impacts; slightly more to
private property in Scenario 2
21,
SEH ,..... _.
Questions?
Emily Jennings.
(651).302-7669
e ienh ings0i), seh inc.co m
SEH lWf.rga0••i iV�M4 /.'sNu�•
9
CITY OF GEM LAKE
Heritage Hall
420U Otter Lake Road I Gem Take, MN 55110.
651447-2790/921651-747-2.795 (fax) -
E-mail cit iyQumlakemn.ore
Gem Lake Workshop
October 12; 2021
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