HomeMy WebLinkAbout2.c. Storm Water IssuesCITY OF ROSEMOUNT
EXECUTIVE SUMMARY FOR DISCUSSION
COMMITTEE OF THE WHOLE OCTOBER 11, 2000
AGENDA ITEM: STORM WATER ISSUES
AGENDA NO.
DISCUSSION
PREPARED BY: THOMAS D. BURT, CITY ADMINISTRATOR
2. C.
ATTACHMENTS: UTILITY COMMISSION STAFF REPORT
This information was presented to the Utility Commission on Monday, September 11 2000. Our engineeing
consultant will be available for discussion and he asks for Council direction.
- 8441 Wayzata Boulevard, Suite 350 B.A. Mitteweadt, P.E.
Minneapolis, MN 55426, B ret
Wi R w eirs, P.E. WSB Peter R Willenbring, P.E.
Donald W. stun, P.E.
�- tel: 763- 541 -4800 Ronald B. Bray, P.E.
& Associates, Inc. fax: 763- 541 -1700
September 8, 2000
Rosemount Utility Commission
City of Rosemount
2875 145d` Street West
Rosemount, MN 55068 -4997
Re: Stormwater Management Issues /Concerns/Problems Within the City of Rosemount
WSB Project No. 1005 -140
Dear Utility Commission Members:
This letter and supportive documentation has been prepared to assist the City in properly responding to the
flooding problems that occurred within the City of Rosemount following an extremely heavy rainfall event
that occurred on July 7 and P, 2000. This event, which deposited up to eight inches of rain in three to five
hours was classified as an event that exceeded a 1 chance of occurrence in any given year. This has also
been referred to as an event that exceeded the intensity of a 100 -year storm. Additional information on this
event is included in Attachment A.
As a result of this rainfall event, many depressions, ponds, street areas, some septic systems, and a few
homes were flooded. Most of the areas that were impacted were located in larger depressional areas that
currently have no means for discharging water from these depressions except through evaporation or
seepage. As a result of this event, a call for a more rapid implementation of the City's stormwater
management plan was brought forth by many of the City's residents. Furthermore, some questions have
arisen concerning whether the current stormwater plan is adequate to address other anticipated impacts such
as those associated with flooding mature trees adjacent to these depressions during major events.
Outlined below, please find a more detailed description of the location and flooding problems experienced
in the identified problem areas. A map showing the location of these areas is also included as Attachment C.
1. Hawkins Pond - Hawkins Pond is a landlocked basin surrounded by residential homes located just
north of 145th Street and west of Shannon Parkway. This pond was developed with a clay -lined
bottom, thereby m aximizi ng the aesthetic features of the pond and minimizing the ability to allow
stormwater to infiltrate. This pond was intended to be controlled through the installation of a lift
station and forcemain outlet. The forcemain is installed within the subdivision, however, still needs
to be connected between the subdivision and Diamond Path. The forcemain was recently installed
along Diamond Path as a part of the Birger Pond storm sewer lift station. This project was
anticipated to be completed in 2003, and $200,000 was allocated for the construction activity.
Additional information will be handed out and reviewed with you at the September 11 2000
meeting.
M inneapolis_ - St. Cloud
Infrastructure Engineers Planners F: , %-P%%cttErrnmwrmosoo- fl..di+B.v+Pd
EQUAL OPPORTUNITY EMPLOYER
A
Rosemount Utility Commission
Rosemount, MN
September 8, 2000
Page 2
2. Marcotte Pond - This pond has been named after the property owner located adjacent to the pond.
The pond is located west of Shannon Parkway, just north of the new Evermoor subdivision. This
pond is a landlocked depression that receives water from properties current under development on
the west and east sides of Shannon Parkway. Prior to the July 7' rainfall, flooding in the depression
had not been a significant issue. According to the adjacent property owner, a number.of years ago,
a storm sewer from the east side of Shannon Parkway was sand- bagged to block flow from this area,
or the pond could have been at or above the projected high water level. This pond has been studied
in detail and a number of alternatives have been identified to address this problem. Flooding of trees
has also been identified as a significant concern. Attachment B provides information related to tree
flooding. This pond was not specifically identified in the CIP for construction, however, $250,000
was allocated for the Kelly Trust trunk in the years 2001 through 2003. Additional information will
be reviewed with you at the September 11`x, 2000 meeting.
3. Keegan Lake - Keegan Lake is located north of County Road (CR) 38 and east of Trunk Highway
(TH) 3 and has no defined outlet. The outlet for this pond is intended to be extended north and east
through the current undeveloped property, ultimately discharging into the Uof N4 property. $500,000
was identified for this outlet to be constructed in the year 2003. Construction of this outlet is
somewhat premature, considering that it was anticipated to be extended through a property that is
yet undeveloped. However, other alternatives can be explored to address this issue in the near term.
Additional information will be handed out at the September 11 2000 meeting.
4. Arland Evanson Property -Arland Evanson lives north of CR 38 just west of Keegan Lake on
132nd Court. Mr. Evanson has a garage that sits on the low side of his property and has a small
ponding area that receives storm water discharged from his neighborhood area, as well as water that
is directed to it from the south side of CR 38 and the Broadway complex. Mr. Evanson's drainfield
was under water during the storm and his garage was flooded. This issue is somewhat related to the
Keegan Lake situation, since this water would typically be directed into Keegan Lake. Additional
information on the problem area will be handed out at the September 11'x, 2000 meeting.
5. Scott Selic -.'&. Selic has a situation similar to Mr. Evanson. His property is next to a ponding area
adjacent to CR 38, just west of Shannon Parkway. This area receives storm water from the Oakridge
Estate area and does not have a positive outlet. Mr. Selic's drainfield is also located in the low area
that is easily flooded, thereby creating not only a health hazard, but an unusable septic system. We
have instructed Mr. Selic to relocate his septic system to higher ground. Additional information on
the problem area will be handed out at the September 11 2000 meeting.
Rosemount Utility Commission
Rosemount, MN
September 8, 2000
Page 3
Recommended Approach/Process for Addressing Flooding Problems;
In order for the City to properly respond to the flooding problems experienced above, it is recommended
that the City take the following approach:
1. Review the policies and design standards that were utilized to develop the City's Comprehensive
Stormwater Management Plan and define whether or not these standards currently are adequate to
meet the City's needs.
• As part of this effort, alternatives would be presented to the City Council in regard to
providing various levels of water quantity management, quality management, funding, and
in general, how you may want to design stormwater storage and conveyance systems,
maintain these systems, provide related concerns.
2. Review City's Trunk Drainage System Layout.
• As part of this task, the City's trunk system layout would be reviewed and discussed for the
3.
4.
purpose of assuring we are meeting, the goals and policies of the City, as well as meeting the
needs of downstream communities in accepting water from these areas. Trade -offs will also
be discussed with the Council concerning the benefits and impacts associated with increasing
discharge rates, decreasing discharge rates, acquiring stormwater storage areas, purchasing
property and/or low homes as opposed to building improvements to protect existing
structures, defining perceived City values regarding loss of vegetation around ponding
systems, and other related issues.
Review/Refine/Redefine City's Stormwater Trunk System Layout and Design Standards.
• The task will compile current City perspectives outlined above.
Provide detailed review and analysis of each of the problem areas and develop proposed solutions
based on updated City policies and perspectives concerning stormwater management.
• Some of this information will be available at the September 11' meeting, but additional
follow -up will be necessary.
5. Develop implementation plan for stormwater management improvements.
• As part of this task, it is anticipated a short-term and long -term implementation plan would
be developed. The short-term plan will include the identification of capital improvement
projects, as well as further define and support City policies and perspectives regarding short
F wpd
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Rosemount Utility Commission
Rosemount, MN
September 8, 2000
Page 4
and long -term water - related impacts. The long -term implementation plan will also be
developed.
Much of the information that has been identified to be developed in the above paragraphs has been, in part,
developed as part of our initial review of these problem areas. Specific recommendations concerning how
to address problems within these areas cannot be finalized until the City has an opportunity to review and
rethink some of the design standards and policies that have been utilized in the past. At the meeting on
Monday, September 11 we will provide you with additional information on each of the problem areas
identified, as well as describe potential alternatives for corrective actions.
Sincerely,
WSB & Associates, Ins
Peter R. Willenbring, P.E. Bret A. Weiss, P.E.
Vice President President
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Torrential Rains Douse South Metro July 7 -10, 2000
Torrential Rains Douse South Metro
July 7 -10, 2000
Torrential rains fell upon the Twin Cities Rainfall Totals
metropolitan area during the weekend of July 7
10.
The spate of severe weather began during the
morning of Friday, July 7 when severe storms
rumbled through the east metro. High winds, hail,
and possible tornadoes led to significant property
damage.
The south metro, specifically the city of Eagan,
received an extraordinary amount of precipitation
later on the 7th and during the early morning
hours of Saturday, July 8. Over eight inches of rain
fell in a three to five hour span across a small area
of northern Dakota county. The climatological
probability of receiving eight inches of rain in a
five hour period for a given location in the
metropolitan area, in a given year, is far less than
Pagel of 2
_= 9
s:
7
6
3
4
3
2
�
Inches
1 %. Prepared by. State CCatrato logy Office. ONR• Waters
Data provided by. Dakota Sod and Water Conservation District
Metropolitan Mosquito Control District
An additional two to three inches of rain drenched National Weather s ervic e
already sodden neighborhoods during the evening
of July 8 and the early morning of Sunday, July 9. Light rainfall fell again late in the late evening
of July 9 and the early morning hours of Monday, July 10. The highest reported weekend rainfall
total was 11.33 inches in southeastern Eagan.
The heavy rains led to extensive damage in some south metro communities. Serious urban
flooding was commonplace, and severe erosion was reported m many areas. One life was lost in a
flood- related incident.
WSI radar based precipitation estimate July 8
WSI radar based precipitation estimate - July 9
WSI radar -based precipitation estimate -July 10
(revised 7 /11 /00)
Return to the Climate Journal
mcw Q, o113.uznn.cd,r
URL: http- J/climste umn e d u /d o di curn al/flash_ffoodstOW10 m
Lan modified: July 11. 2000
711'7
PRECIPITATION
( INCHES)
FIGURE _ 1
GRAPH OF PRECIPITATION VS. TIME FOR MAJOR
RAINFALL EVENTS
RP
7/23- 24/87
INFALL. EVENT
4,
9130/17
'
,°
'RAIN
ALL E,
f:NT
•
45
TIME 4
(HRS.)
I le
O
0
2 4 6 8
10
PRECIPITATION
( INCHES)
TABLE 2
RAINFALL IN HNNEAPOLIS -ST. PAUL METROPOLITAN AREA
FOR DURATIONS FROM 30 MINUTES TO 24 HOURS AND
CHANCES OF OCCURRENCE PER YEAR RANGING -FROM 1% TO 99%
Data Taken from U.S. Department of Commerce - Weather Bureau
Technical Paper No. 40 - Dated May; 1961
Chance of 24 -Hour 12 -Hour 6 -Hour 3 -Hour 2 -Hour 1 -Hour
30 Minu tes
Occurrence
_99+ 2.3 2.0 1.7 1.5 1.4 1.2
0.9
50% 2.8 2.4 2.1 1.9- 1.7 1.4
1.1
20 3.6 3.1 2.7 2.3 2.2 1.8
1.4
10% 4.2 3.7 3.1 2.6 2.5 2.1
1.7
4% 4.6 4.2 3.5 3.0 2.8 2.3
.1.9
2 % 5.3 4.6 4.0 3.4. 3.1 2.7
2.1
1% 5.9 5.0 4.4 3.8 3.5 2:9
2.4�
City of A Anthony
Page 9
WSB Project No. 1065.11
BA Mmdmmd r, P.E.
350 Westwood Lake Office Bret A Weiss, RE -
8441 Wayzata Boulevard Peter R. Willenbting. P.E.
Minneapolis, MN 55426 Donald W. sterna, EE
Ronald B. Bray, EE.
- -- 612- 541 -4800
& Associates, Inn% FAX 541 -1700
Memorandum
To: Bret Weiss
Pete Wdknbring
From: _ Andi Moffatt
Date: August 24, 2000
Re: Affect offlooding on oak trees
As requested, I have investigated the flooding tolerance of bur oak and swamp white-oak. These
two species were determined to be the trees present near the pond in Rosemount based on leaves
collected by Bret.
The following sources were consulted to detennine the general flooding tolerance of the oaks:
• National Audobon Society Field Guide to North American Trees
• MnDOT Plan Matrix CD-ROM
• Minnesota Plant List that Occur in wetlands
• Flooding and Its Effects on Tres
• Professional opinions from Jeff Lutz and Tom Moffatt
While oaks in general are generally intolerant of flooding, based on the information gathered, both
species at the site are somewhat tolerant of flooding. Information from the document Flooding and
Its Effect on Trees ( attached) indicates that swamp white oak and 'bur oak are able to survive
flooding or saturated soils for 30 consecutive days within the growing season. With that said, this
type of continuous. stress on the tree year after year could eventually lead to its decline and death.
If flooding occurred in the late winter when the trees were dormant, it is anticipated that the
negative impact of flooding would be signif cantly reduced since 1) the trees would not as actively
be transporting materials through the vascular system as they do during the growing season, and 2)
the soil would rely not reach anaerobic conditions since soil microbes are not as active -in cold
temperatures.
Many other factors play a role in a tree's susceptibility to being impacted by flooding such as
species variation, general health and age of the tree, and water movement, etc. Therefore, while it
cannot be determined for certain, it is anticipated that these trees could withstand 30 consecutive
days of flooding provided that this type of stress did not occur annually and/or occurred when the
trees were dormant. It is anticipated that less prolonged flooding (1 -2 weeks) would have less of an
impact if it occurred on an annual basis.
If you have any questions, please let me. know.
Minneapolis St. Cloud
Infrastructure Engineers Planners
FLOODRSTG and its effects Trees, Flood Tolerance of Trees
�
Page 1 of 6
- 7 _
Flood Tolerance* of Frees
Numerous studies have been conducted to help foresters and natural resource managers
understand the impact of flooding on trees (see bibliography). The state -of -the -art,
however, has not developed sufficiently td warrant a- precise statement on the adaptability
of a species to a specific flooding situation. Conclusions from different studies are often
contradictory, caused in part by the physiological responses of the tree as it interacts with
environmental conditions. Since these environmental conditions are not well understood,
as well as the difficulty in catego tree species over their entire range, flood tolerance
predictions must be carefully evaluated in general terms. A brief review of soil, tree, and
flood characteristics indicates the complexity of these interactions.
soils
The following soil- related points are important in understanding flooding effects on trees.
Soil Aeration
Flooding results in poor soil aeration because the supply of oxygen to flooded soil
is severely limited. Oxygen deficiency is likely the most important environmental
factor *.hat triggers growth inhibition and injury in flooded plants. -
PH
Flooding of soil increases the pH of acid soils and decreases the pH of alkaline
soils.
Organic Matter
The rate of decomposition of organic matter in flooded soil tends to be only half
that in an unflooded soil. The major end products of decomposition of organic
matter in flooded soils are carbon dioxide, methane, and humic materials. In
addition, high concentrations of ethanol and hydrogen sulfide are produced in
waterlogged soils which can be damaging to root systems.
Sedimentation
Deposits of silt or sand as shallow as three inches may seal over and smother tree
roots by limiting the supply of oxygen. Species vary in tolerance to sedimentation,
but all seedlings are susceptible to root injury. Eastern cottonwood, baldcypress,
tupelo, and black willow seedlings can withstand moderate station.
Scouring
Strong currents, waves, or suspended particulates may cause soil around the base _
of the tree to be washed away, exposing tree roots. Exposed roots can lead to not
http: //willow.ncfes.i mn.edu/Flood/toler.htm 08/17/2000
FLOODING and is effects Trees, Mood Tolerance of 'Frees Wage 2 of b
only tree stress but can make the tree more vulnerable to windthrow.
Trees
Various characteristics of a tree affect its flood tolerance with the most prominent
presented below. -
Height
Tree in ury increases in proportion to the percent of crown covered by water.
Species that can survive standing in several feet of water for months may die in less
'than one month when their foliage is completely covered. Few species can tolerate
more than one month of complete submersion during the growing season
Crown Class
Trees in the dominant crown class survive flooding much better than trees in lower
crown classes.
Age
,A-&h trees tolerate flooding better than overmature trees or seedlings of the same
species. Therefore, some species rated as flood tolerant may quite sensitive in
the seedling stage. Seedlings often die because they are pushed over, buried in mead,
or uprooted.
Vigor
Tree vigor at time of flooding influences tolerance. Vigorously growing, healthy
trees withstand flooding better than less vigorous trees. Tree vigor may be
irrelevant, however, if the tree is totally submersed in water.
Roots
Long -term flooding leads to death and decay of large portions of a tree's root
system (see section on Management implications for windthrow problems). During
flooding, some species can maintain normal roots in an active or dormant condition,
others rely upon new secondary and adventitious roots tha rmay form from the root
collar or on the trunk near the water surface. Species unable to either maintain
normal roots or grow new ones can qulcldy die.
Species Variations
Flood tolerance variations within a species are not well understood. Mood tolerance
may be an inherited trait and this may explain some of the discrepancies in reports
on surruvival. (Research methodologies also may vary from one study to another, -
ccntnbuting to contradictory conclusions). However, it is generally accepted that
some species have greater tolerance for flooding. than others (see Tables 1, 2, and
3).
Floods
Determining flood tolerance is complicated by the diverse characteristics of floods.
Season
httpJ flow .ncfes.;mm.edu /1~loodltoler.htm 08/17/2400
FLoODING and its effects Trees, Mood Tolerance of Trees Wage 3 of S
Flooding during the growing season usually is more harmful to woody plants than
flooding during the dormant season. Specifically, trees are most susceptible to
flooding in late spring just after the first flush of growth. The tithing of a spring
flood influences species differentiation. For example, since silver maple flushes
earlier than green ash, an early flood might be more damaging to silver maple while
a later flood more injurious to green ash
Duration
The longer trees are exposed to flooding, the greater the potential for fury. Most
trees can withstand only 14 months with water being continuously over the soil
surface. Short periods of flooding during the growing season can be tolerated by
most trees. However, if flooding is recurrent and keeps the sod saturated or
prevents recovery from previous flooding, injuries will accumulate and serious
damage may occur.
Water Level
The depth of water influences flood tolerance. The mortality rate is less for trees in
saturated soils than for trees with water covering the soil. Alter water covers the
soil, the depth may have little significance until the lower foliage is covered;
research results, however, differ on this point. Tolerance to complete submersion is
much lower than tolerance to shallower depths of water.
Temperature said Oxygen
Cold water is less injurious than warm dater due to cold water's capacity to hold
more dissolved oxygen. Rapidly flowing water (with higher oxygen content) is less
harmful than stagnant water.
Mechanical uajuries
An often overlooked aspect of flood damage is mechanical injury caused by cur -
rent, wave action, and floating debris. Young tree plantings may be especially
damaged by current and wave action. Floating debris can injure both small and
large trees.
Chemicals
Floods may carry various chemicals that have been pit up as runoff from
agricultural fields and other areas or from sewage released why treatment facilities
become unable to handle large volumes of water. The impact depends upon the
type and dosage of chemicals.
Tolerance Categories
Tables and Table 1 present a summary of the research pertirtent to flood-tolerant trees
and shrubs for three geographical divisions (districts) of the U.S. Army Corps of
Engineers: Lower Mssimippi Valley, Missouri River, and North Central (see Figure 1).
These three divisions include a majority of the foresdand flooded during 1993.
http:// willow .ncfes.umn.edu /Flood/toler.htm 08AV2000
F..... OODLNG and its effects Trees, flood Tolerance of Trees
Page 4 of 6
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Table ? combines research results from the Lower Nssissippi Valley and the Missouri
River divisions. Since classification is relative, flood tolerances are best viewed as
overlapping from one tolerance category to the next. Where research results differed
between Lower Mississippi Valley and Missouri River studies, species are classified into
two tolerance categories. The tolerance categories in Table I should be interpreted as
follows:
Very Able to survive deep, prolonged flooding for
Tolerant more than one year.
Tolerant Able to survive deep flooding for one growing
season, with significant mortality occurring if
flooding is repeated the
following year.
Somewhat Able to survive flooding or saturated soils for 34
T'oler'ant consecutive days during the growing season.
intolerant Unable to survive more than a few days of
flooding during the growing season wWx)ut
significant mortality.
Table 2_ which presents the results of an Illinois study, is the most comprehensive in the
North Central Division. It is important to note that the flood tolerance categories in Table
2 differ from Table I in both name and definition. Table 2 tolerance categories should be
interpreted as follows:
http- //willow.ncfes.umiL edu/Flood/toler.htm 03/17/2000
FLOODING and its effects Trees, Flood Tolerance of Trees
Page 5 of 6
Tolerant Most individuals survived more than 150 days of
. flooding during the growing season
Somewhat Some individuals killed by less than 90 days of
Tolerant flooding and some individuals survived greater
than 150 days of flooding.
Slightly most individuals survived more than 50 days but
Tolerant less than 100 days of flooding.
intolerant Severe effects wah less than 50 days of flooding.
Mg-ble 3 provides flood tolerance ratings for cultivated woody plants in New York
subjected to a growing season flood- (June 1972). The species listed in Table 3 are
commonly available in the landscape trade and are frequently used in park landscapes and
urban settings in the Midwest and the Great Plains. Because Table 3 'is based on a short
duration flood (10 days), information on the intolerant species (those killed or damaged)
will be of the most use to practitioners.
It should be noted that Tables 1 -3 classify tree and shrub species tolerance relative to
continuous, rather than intermittent, flooding. Some species, for example, might tolerate
one year of continuous inundation but only 3-4 months of intermittent flooding. Also,
some sites affected by the 1993 floods in the Midwest and the Great Plains had soil .
saturation up to 90 days prior to flooding. Consequently, the factors of soil saturation
prior to flooding and continuous versus intermittent flooding must be considered when
predicting the relative flood tolerance of species.
With the exception of the tolerance ratings for haekberry, green ash, and shingle oak,
Table 1 is more conservative in its tolerance ratings than Table 2. Table 1 includes more
species than Table 2 and is based on a summary of studies from a broader geographical
area. Consequently, Fable I is recommended as thefield guide " forBem and o &er
resource managers who are evaluatdngflood aged #Tees in the MI'd vest and the
Grew PWns.
References
Barry, P. 3., Anderson, R. L., and K M. Swain. Undated. [How to Evaluate and Manage
Storm-Damaged Forest Areas.] Southeastern Area, U.S. Forest Service. 15 p.
Bell, D. T., and E L. Johnson. 1974. [Flood -I aused Tree Mortality Around Illinois
Reservoirs.] Trans. Ill. State Acad. Sci. Vol 67 (1): 28 -37.
Broadfoot, W M.., and I3. L. Williston. 1973. [Flooding erects on Southern Forests.]
Journal of Forestry. Vol 71(9): 584 -587.
Hook D.D. 1984. [Waterlogging Tolerance of Lowland Tree Species of the South.]
Southern Journal of Applied Forestry. Vol 8 (3): 136 -149.
http:// wfilow .ncfes.umn.edu/Flood/toter.htm 08/17/2000
;~LOODh G and its effects Tress, Florid Tolerance of Trees Page 6 of 6
KozlowsK T. T., Kramer, P. 7., and S. G. Pallardy. 1991. [Soil Aeration, Compac- tion,
and Flooding.] in The Physiological Ecology of Woody Plants, New Mork: Harcourt
Brace 3ovanovich. 303 -337.
Loucks, W. L. 1987. [Flood- Tolerant Trees.] Journal of Forestry. loch: 36-40.
Missouri Department of Conservation. 1993 (Summer). [The Effect of Flooding on
Trees.] Missouri Forest Management Notes. Vol 5 (3): 1 -2.
White, R_ M. 1973. [Plant Tolerance for Standing Water: An Assessment.] Cornell
Plantations. Vol 28: 50-52.
Whitlow, T. H., and R W. Harris. 1979. [Flood Tolerance in Plants: A State -of- -the - Art
Review.] National Technical Information Service, U.S. Dept. of Commerce. August: 1-
161.
Retain to the Tab €e
08/1772000
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Flooding and its effects on trees, Table 1
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TABLE 1
Page 1 of 3
Marilyn LCWJ agwata
Shagbark hickory X
Robert Nethercut
Mark M. ja tomentosa
Mockermrt hickory X
01scLeltis IaMgata
-� a tolerance of trees and shrubs to flooding during the growing season,
SL Pard and er Mississippi Volley and Missouri Ri ver Divisions.
Swamp lit' X
,Umsq Countp ounce: Whitlow and Farris 1979)
Hackberry X
Jerry Seck�
Marsha Sotta?w occidentalis
Comm Very
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1621 Beechwood Ave.
St. Paul, MN _lutes
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T Intoleraut
651 -698 -454
Downey hawthorn X
Bluffs Project hl�3�a triacanthos
MW fdenftfthe A gzwdo
Boxelder X
X
President . Acer rubrwn
Red maple X
Ilex decidua
Perry R. Bolin
Vice Presidenticer saceliarinum
Silver maple X
X
Jeanne W31} rugosa
Hazel alder
X
Treasurer
James R. ac er
Directors Betula nigra
River birch
X
Craig An
Theresa Baa atica
'
Water hickory X
Dan Co ti
Thomas Tdaj j l89rdiformis
Bitternut hickory
X
Neil Franey
William Fla illinoensis
Pecan X X
Elaine Jo son
a lacfniosa
Shellbark hickory
Esther Re
Marilyn LCWJ agwata
Shagbark hickory X
Robert Nethercut
Mark M. ja tomentosa
Mockermrt hickory X
01scLeltis IaMgata
Sugmberry X
Sco
Swamp lit' X
Pierre RegFi Ws occidentalis
Hackberry X
Jerry Seck�
Marsha Sotta?w occidentalis
Buttonbush X
Vice President bNr£anadensis
Redbud X
Samuel H. Morgan
Director Emeri&rn=.loner
Flowering dogwood X
David Lit! staegus mollis
T W
Downey hawthorn X
roman rter
Ex Officio
Dennis AsbAWyros W?Vniana
Persimmon X
Thomas E um
Marc Goess
Greg MacicForesteria acuminata
Swamp lit' X
Terry Noo nus amencana
White ash X
Vic Wittgenstem.
Executive Dired�rars permsylvanica
green ash X X
and Secretary
Peggy Lynch
Mississippi Riaeditma aquatics
Waterlocust X
Bluffs Project hl�3�a triacanthos
Honeylocust X
Cindy Schwie
X
Gymnocladus dfoicus
Kentucky caff=tree
Ilex decidua
Deciduous holly X
Ilex opaca
Amencan holly . X
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Flooding and its effects on trees, Table 1
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siyraeiflua Sweetgum X
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Ramsev Cow ty s rubra
Red mulberry
X
jVyssa aquatica
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Blackgam
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Shortleaf pine
X
President Pines We&
Loblolly pine
- X
Peuy R. Bolin
Vice President0lanera aquatica
Waterelm
X
Jeanne Vei
Treasurer at us occidentalis
James 9ncier
Sycamore
X
X
R.
Directors Populus deltoides
Eastern cottonwood
X
Craig Andresen
Theresa B+rPil li
Ply
X
Dan Co . arofina
Blau cherrY
X
Thomas Wight
Neil Franey
X
William locus albs
White oak
Elaine Jollpson '
bicolor
Swamp white oak
X
Esther K ��s
Marilyn firlcata
Southern red oak
X
h &
Robert Ne ercut
Mark M. ins imbricmia
Shingle oak
X
Janet Olt
_ereus l}rata
R
a'�P oak
Scott ay
Pierre RelAarcus macrocarpa
Bur oak
X
Jerry S I ecir
Marsha Sa marilandica
Blaclgack oak
X
Vice President nigra
Water oak
X
Samuel H. rgan
Director Emeri@uercus nuttallii
Nuttall oak
X
Truman David � s palustris
Pia oak
X
Ex Officio Quercrus phellos
Willow oak
X
Dennis Asmussen
Thomas EYfcus rubra
Red oak
X
Marc Goe ercus shumar&i
Sh amard oak
X
Greg Mack'
X
Terry NocQwrcus stellata
Post oak
Vic Wittgenstein
Executive Dire4ke?'w veludna
Black oak
X
and Secretary
Peggy L y� C i�'lix idgra
Black willow
X
Mississippi River
X
Bluffs Project s albidum
Sassafras
Cindy Sch gi�,� ..
Taxodium distfchum
BaldOn=ss
U nus alata
Winged. elm
X
http:/l wMow. ncfes .umn.edu/Flood/floodtbll.him 08/17/2000
Flooding and its effects on trees, Table 1 Page 3 of 3
?arks an ��
N am ncana American elm X
CIE ruhra Red elm X
St. Pmd and °'O�.,r ery Tolerant: able to survive deep, prolonged flooding for more than 1 year.
2 Tolerant: able to survive deep flooding for one growing season, with significant
mortality occurring if flooding is repeated the following year.
1621 Beechwood Uomewhat Tolerant: able to survive flooding or saturated sods for 30 consecutive days
Sc Paul, MN 5511 during the growing season.
651- 698 -4543
%w hiendsottheparimo
w �ntolerant: unable to survive more than a few days of flooding during the growing
President
season without significant mortality.
Perry
Vice Presiqftt
Jeanne Weigum
Treasurer
James R. $richer
Directors
Craig Andresen
Theresa Bradshaw
Dan Collins
Thomas T. Dwight
Neil Franey
William Frank
Elaine Johnson
Esther Kellogg
Marilyn Lundberg
Robert Nethercut
Mark M. Nolan
Janet Olson
Scott Ramsay
Pierre Regnier
Jerry Seck
Marsha Soucheray
Vice President Emeritus
Samuel H. Morgan
Director Emeritus
David Lilly
Truman W. Porter
Ex Officio
Dennis Asmussen
Thomas Eggum
Marc Goess
Greg Mack
Terry Noonan
Vic Wittgenstein
` Executive Director
and Secretary
Peggy Lynch
Mississippi River
Bluffs Project Manager >
Cindy.Schwie
http: //willow.ncfes.imm edu/Flood/floodtbllIfin 08/17/2000
Flooding and its effects and on trees, Table 2 Page 1 of 2
TABLE B
Relative tolermce of Illinois t to flooding during the grog meson.
(Source: Bell and Johnson 1974 ).
NOTE: Flood tolerance
categories in Table 2 differ from Table 1 in both name and definition.
Somewhat SHOtly
Species
Common N=me
Tolerant'
Tolesant ToleranO Lxtolerant
Acer negundo
Bawider
X
.4c--r saccharimun
Silver nL*e
X
Cwya ovata
Sbagbarkhickwy
X
Carya tomentosa
Mod=nutbidwry
X
Celds occidentalis
Aadd)eny
X
Cercis canadends
Reid
X
Crataegus mollis
Downy hawthorn
X
Diospyros WiVniana '
Persimamn
X
Aglans nigra
Black wahmit
X
Fraadn= pennsylvaWca
Cheen ash
X
Gle&tda triacanthos
Honeyloc=
X
Platxw ocddeata&
Sy re
X
Populus deltoides
F. 9= cottonwood
X
Prunes serotina
Black sherry
X
Quercus alba
White oak
X
Quercus bicolor
Swamp white oak
X
Que=s impricaria
Shingle oak
X
Quercus macrocarpa
Bar oak
X
Quercus pahatds
Pia oak
X
Quercus rubra
Red oak
X
Quercus velutina
Black oak
X
Salix nigra
Bla& wfflaw
X
Sassafras albidum
Sassaftas
X
http / hwfflow.ncfes.umn.edwTlotxl/flQOdt -htm 08/17/2000
Flooding and its effects and on trees, Fable 2 Page 2 of 2
Ulm= americma American elm X
I Tolerant: most individuals survived more than 150 days of flooding during the growing
season.
2 Somewhat Tolerant: some individuals killed by less than 90 days of flooding and some
individuals survived greater than 150 days of flooding.
3 Slightly Tolerant: most individuals survived more than 50 days but less than 100 days of
flooding.
4 Intolerant: severe effects with less thaw 50 days of flooding.
Back
http:// willow. ncfes.umn.edu /Flood/floodtbl21tra 08117/2000
Marcotte Pond Outlet Feasibility Analysis
Rosemount, MN
WSB Project No. 1275 -003
Prepared for:
City of Rosemount
September 2000
Prepared by
WSB & Associates, Inc.
8441 Wayzata Boulevard, Suite 358
Minneapolis, MM 55426
Marcotte Pond Outlet FeasibOy Anabsfs
City of Rosemount
WSB Project No. 1275 -003
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I. Introduction / Background /Description of Problem
Marcotte Pond is located in the northwest comer of the City of Rosemount. It is generally
located west of Shannon Parkway and north of the Evermoor Development. The pond
encompasses an area of approximately four acres and is surrounded by mature oak trees.
The City's Comprehensive Stormwater Management Plan anticipates the watershed tributary to
Marcotte Pond encompasses an area of approximately 390 acres. It has an anticipated normal
water elevation of 906.0, a high water elevation of 914.4, storage volume of 35.9 acre - feet, a
proposed outlet of a 15 cfs lift station. The plan anticipates this water to be pumped to Birger
Pond via a combination of a forcemain and gravity system.
A survey of Marcotte Pond was completed in August of 2000 and identified mature oak trees
present around the perimeter of the basin at an elevation of 908. Recent heavy rainfalls in
Rosemount have raised the water elevation in this pond to close to the high water level. The
property owner adjacent to this pond has significant concerns regarding the impact of these high
water elevations on the mature oak trees in the area. Additional information is attached on the
duration to which oak trees of this species can tolerate high water elevations.
At the present time, no formal outlet is available for Marcotte Pond. Although the City's
stormwater management plan identified a 15 cfs lift station to be constructed in the future to
service the pond outlet, this lift station has not yet been constructed. Furthermore, based on the
City's stormwater plan, even with this 15 cfs lift station installed, under fully - developed
conditions, 100 -year high water elevations of 914.4 be anticipated. This is a very large lift
station, however, it would still serve as a means to lower the pond from the HWL to the NWL
following a rainfall event.
It is also noted that an existing easement encompasses approximately 4.2 acres around the
Marcotte Pond. A survey of the perimeter of the basin indicates that this easement was acquired
to an elevation slightly lower 910.0. Utilization of the pond to the proposed 100 -year high water
elevation of 914.4 would require additional easement acquisition.
The City's Comprehensive Stormwater Management Plan proposed a lift station to be
constructed at a cost of approximately $335,000.
Generally speaking, the problems that have been identified with the Marcotte Pond include the
following:
Mamae Pond Outlet Feasibi o Analysis
City of Rosemount
WSB Project No. 1275: 003
Page I
• Lack of an adequate drainage easement to accommodate high water
elevations identified in the City's Comprehensive Stormwater
Management Plan.
• Concern by the property owner that allowing water elevations in the pond
to reach planned levels will impact mature trees in the area.
• The cost to construct a lift station having a capacity anticipated in the
City's stormwater plan will be costly.
• The property owner in the area has expressed grave concerns regarding an
immediate need to provide an outlet and subsequent relief from high water
elevations in this basin.
H. Review of Alternatives Available to Address the Problem
Based on a review of the information outlined above, we have identified a number of alternatives
that could be considered to address the identified problems. Outlined below, please find a
description of these alternatives, along with a listing of the advantages and disadvantages
associated with each.
A. Alternative 1
Construction improvements per the City's Comprehensive Stormwater Management Plan
with additional construction of a berm along north and west easement line of Marcotte Pond to
provide additional protection for trees and limit ponding within the identified easement. The
City's stormwater management plan proposes to construct a 15 cfs lift station to carry water to
Birger Pond under this scenario.
1. Advantages o f Provosed Improvement
• Less surface area required for stormwater ponding.
• Reduced tree and shoreline vegetation impact due to less frequent
inundation.
15 cfs pumping capacity returns basin to normal water level within 3.4
days for the 100 -year, 24 -hour event.
+ Reduce costs for easements as impoundment would be limited to areas
within berm.`
Marcove Pond Outlet Feasibility Analysis
Cky of Rosemount
"B Project No. 12 75 003 Page 2
2. Disadvantages
• Increased stormwater storage volumes upstream resulting in increased
impacts for vegetation along shorelines and need for easements.
• Increased maintenance would be necessary for two -stage outlet structures
that would be incorporated into upstream impoundment projects.
D. Alternative 4
Excavate Marcotte Pond to lower normal water level three feet and add six acre -feet of
additional stormwater storage, reduce discharge to 6 cfs, restrict upstream discharge rates
per previous discussion.
1. Advantages
• Reduce lift station cost.
• Improved infiltration and evaporation.
• Reduced berm construction necessary.
2. Disadvantages
• Excavation of Marcotte Pond may require wetland mitigation.
• Water elevation fluctuations will be increased.
• Additional costs associated with excavation.
• Greater tree impact in upstream basins.
E. Alternative 5
Construct 3 cfs lift station, construct larger basin, purchase expanded easement, and
utilize upstream depressions for storage as necessary.
1. Advantages
• Significantly reduced cost.
• Less shoreline impacts in upstream basins.
• Increased detention time in Marcotte Pond.
• Reduced impacts on Birger Pond.
Marcone Pond Outlet Feasibility Analysis
City of Rosemount
WSB Project Na 1275:003 Page 4
2. Disadvantages
• Land acquisition costs.
• Tree impacts for basin expansion.
' Loss of taxable property.
F. Alternative 6
Utilize combination of permanent lift station and mobile diesel pumping station.
1. Advanta,�es
• Diesel pump does not require electricity for operation.
• Pump can be utilized at different locations throughout the City to pump
landlocked basins or be utilized to further increase the capacity of the
Marcotte Pond outlet.
• Appears to be a cost- effective way to deal with more than one problem.
2. Disadvanta
• Increased maintenance and labor intensive operation of diesel pump.
• Increased noise.
G Alternative 7
Utilize independent contractor to provide pumping equipment/pipmg and hoses as
necessary to reduce water elevations in basins throughout the City.
1. Advantages
• City would have reduced capital costs.
• Additional City staff would not be required.
• Depending on usage, this could reduce capital intensive improvements
significantly.
2. Disadvantages
• Additional noise
• Likely would receive increased impacts to shoreline vegetation.
• Last time, cost for pumping exceeded $200,000.
Marroue Pond Outlet Feasibility Analysis
City of Rosemount
WSB Project Na 1275 -003 Page 5