HomeMy WebLinkAboutUntitled (2) 1
• Perro Creek k Minor Watershed Study
for
1 The Middle St. Croix River
Watershed Management Organization
SEH No: A-MSCWM9401.0O
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i
April 1994
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' SHORT ELLIOTT HENDRICKSON INC.
1
AT,
MULTIDISCIPLINE!).
SINGLE SOURCE.
I
I 0 Alp. ,-,:,
3535 VADNAIS CENTER DRIVE,200 SEH CENTER,ST.PAUL,MN 55110 612 490-2000 800 325-2055
ARCHITECTURE • ENGINEERING • ENVIRONMENTAL • TRANSPORTATION
IJanuary 21, 1994 RE: Middle St. Croix Watershed Management
Organization ,
Perm Creek Study
SEH No. A-MSCWM94®1®e
Mr. Chuck Erickson
Bonestroo, Rosene, Anderlik, and Associates
2335 West Highway 36
St. Paul, MN 55113
a
Dear Mr. Erickson:
SEH is in the process of gathering information within the tributary watershed for the above
referenced. Ms. Barb O'Neal,Mayor for the City of Oak Park Heights, suggested SEH contact
your firm to obtain copies of the following:
1. As-built Storm Sewer Plans
A. We request you provide plans of the items marked in pink on the enclosed
print. We have obtained plans from MnDOT for items marked in yellow.
0 2. One copy of past drainage/watershed studies within the City
A. Including pond data and input/output from hydrology models such as
Hydrocad.
We would like to receive this information on or before January 31, 1994 if at all possible.
IPart of the study will address the impacts of eliminating runoff north of Highway 36 from the
Perro Creek Watershed. This will require close coordination with MnDOT. Once we recieve
mapping for the watershed, a meeting will be set up to discuss this issue with MnDOT and the
I WMO.
Thanks for your cooperation.
Sincerely,
1
Jeff Davis, P.E.
Project Manager
tlo
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Enclosure
AD c: Barb O'Neal, Oak Park Heights
Tim Fredbo, Washington SWCD
SHORT ELLIOTTCNIPPEWA FALLS, WI MADISON,WI
HENDRICKSON INC. MINNEAPOLIS,MN ST.CLOUD,MN
I
I3535VADNAIS CENTER DRIVE,200 SEH CENTER,ST.PAUL,MN 55110 612 490-2000 800 325-2055
• ArlIP5a1
ARCHITECTURE •
ENGINEERING • ENVIRONMENTAL
•I Meeting Notes
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Re: Perro Creek Study
SEH No. A-MSCWM9401.00
Bayport, Minnesota Date of Meeting: February 22, 1994
Middle St. Croix WMO
1 Time of Meeting: 8:30 a.m.
From: Jeff Davis
Project Manager
I
win is a brief summary of the items discussed at the above referenced meeting:
The follo g
I. Attendance - Sign roster
U. Introductions
411 III. Discussion
A. Diverting
the runoff generated north of Highway 36 to the St.Croix River as part
of the future Mn/DOT project(s) is physically possible
B.
Mn/DOT has selected a preliminary site for a detentionoem nt(s)pond
thate it receive
runoff generated from the future highway imp
I
near the existing Dahl-Tech facility.
Based on the existing preliminary plan,acquisition of the property near Dahl-Tech
IC.
facilities will be required.
D.
Some of Pete Miller's property below the hill and west of T.H. 95 is serving as a
Idetention basin at the present time.
E. Mn/DOT will
proposedH
have about 98 acres of highway right-of-way draining into the
I Highway 36 storm sewer. If Stillwater osd Oak systemPark thehtr'ibutary
ts direct
runoff generated north of Highway 36 into proposed
area will be about 230 acres.
I of
F. the
proposed Highway 36 improvement is constructed, someonofd.a runoff
frromom the south frontage road will likely still flow into th p p
I G. Mn/DOT will review the drainage patterns for the area south of Highway 36 as
part of the proposed highway improvement.
•
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MADISON,WI
SHORT ELLIOTT MINNEAPOLIS,MN
ST.CLOUD,MN CHIPPEWA FALLS,WI
HENDRICKSON INC.
I
IMeeting Notes
1111 February 22, 1994
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Page 2
IH. Communities discharging into the proposed Highway 36 storm sewer system may
be required to share in the cost of construction. Basis for that participation may
Ibe on a "CA" basis.
C = coefficient of runoff
IA = Tributary area
I. Mn/DOT asked about the MSCWMO requirements for permitting a storm sewer
I outlet to the St. Croix River. Control of erosion in the outlet channel by using
riprap and the discharge velocity requirements were also discussed.
J. County Road 21 improvements are still in Washington County's Capital
Improvement Plan for 1994. This improvement could be delayed if necessary.
I K. The Bayport representative indicated the City would prefer that the County Road
21 project be constructed this year.
I • L. Washington County can raise the County Road 21 roadway profile without
significant effort. This would provide additional storage in the prison pond.
M. Washington County's preliminary plan shows an overtopping elevation at the
Iprison pond of 749±. Raising the centerline profile to 750 would put it slightly
above the top of the emergency embankment elevation of 749.5.
1 N. Raising the County Road 21 centerline profile may result in water encroaching
onto private property.
I O. Washington County does not have detailed property information along County
Road 21 at this time.
I P. SEH will set up a meeting with the MDNR, MSCWMO, Mn/DOT, Washington
County, etc. as soon as we have preliminary hydrologic information.
IIf there are any corrections required, please contact me at 490-2025.
I Attachment
c: Ann Terwedo, City of Stillwater
Barb O'Neal, City of Oak Park Heights
I Ken Hartung, City of Bayport
Jo Heikes, MnDOT
S Ron Dahlquist, Washington County
Tim Fredbo, Washington SWCD
I JOB
Short-Elliott-Hendrickson, Inc. SHEET NO. _ OF
Consulting Engineers - 2-Z Z-
CALCULATED BY _ DATE
St. Paul, Minnesota - Chippewa Falls, Wisconsin
CHECKED BY..._-_..__.____.._.__.-_--._-
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ESTIMATED COST FOR PRISON POND
OUTLET $70,000 ,
I
$20,000
WASHINGTON CO TO PICK UP
I $50,000
BALANCE FOR MSCWMO
I G
k)
)`9. /
3)( ////\\Dr (1 ' BREAKDOWN BY COMMUNITY
I 3 . 17% _ $1, 585
STILLWATER
I OAK PARK HEIGHTS
44 .85% = $22,425
1 26 .78% _ $13 , 390
gAYT0WN
25 .20% _ $12.600
gAYPORT
$50,000
0 63-' LAXb ( 1:(1k--e)t)
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'�' - as
s'e 2,
Perro Creek Minor Watershed Study
for
The Middle St. Croix River
Watershed Management Organization
SEH No: A-MSCWM9401.00
April 1994
I hereby certify that this rep 't w. . pre•ared by me or under my
direct supe ion and a`/(a d y Registered Professional
Engineer unde the la •- :/ tate h f esota.
Date: April 1994 Reg. No. 16997
41111,
Reviewed by: ` 1
Date: 4.
i
' Short Elliott Hendrickson Inc.
3535 Vadnais Center Drive
St. Paul, MN 55110
(612) 490-2000
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Table of Contents
ini
IConclusions 1
IRecommendations 3
Introduction 4
IPurpose and Authorization 4
Method of Analysis 5
I Background Information 5
Hydrologic Cycle 6
I Existing Conditions 7
Urban Watershed Analysis 7
Rainfall 7
I Runoff 8
Time Parameters 8
Model Development 9
Model Discussion 10
IModel 1 10
Model 2 10
Model 3 11
la
Model4 11
Model 5 11
Models 6 and 7 12
IWater Surface Profile Model 13
I Perro Creek Minor Watershed Management Possibilities 14
Example 14
Example 14
IExample 15
Maintenance Plan 16
IImprovements 17
Reconstruction of the Prison Pond Outlet 17
IOutlet Through Railroad Embankment 18
Improvement Costs 19
I Reconstruction of the Prison Pond Outlet 19
Outlet Through Railroad Embankment 19
Cost Allocation 19
l Funding 21
Advantages . 21
11/ . Disadvantages 22
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411, April 1994
1111
Perro Creek Minor Watershed Study
for
' The Middle St. Croix River
111 Watershed Management Organization
Conclusions
tFrom the results of our study and investigations,we have concluded that:
1. Flooding has previously occurred on Perro Creek.
2. Cost of
improvements alongPerro Creek based on the 1988 study
' were enormous.
3. The 1994 existing conditions model (Model 2) shows an overall
reduction of flow when compared to the 1988 existing conditions
• model.
4. Water will pond at various points along Perro Creek based on the
' 1994 models.
5. The 1994 existing conditions model (Model 2) predicts a peak water
' surface at or just below the floor elevations of adjacent houses. This
is also substantiated by the water surface profile model.
' 6. Raising County Road 21 and diverting runoff north of Highway 36
to the St. Croix River will have some impact on Perro Creek
discharge rates.
7. Two subwatershed areas modeled do not contribute flow/discharge
into the Perro Creek system.
8. Study models can be used to assist in the future management of the
Perro Creek minor watershed.
9. Maintenance of Perro Creek is a key element in management of the
watershed.
10. The City of Bayport expended approximately $15,000 to control the
110 Prison Pond discharge and build-up of ice in early 1994.
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Middle St. Croix River Watershed Management Organization Page 1
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11. Concerns have been raised about the structural integrity of the
existing Prison Pond outlet.
' 12. Washington County intends to start reconstruction of County Road
21 in mid-1994.
13. A new outlet is required at the Prison Pond to meet all of the
operational needs of the affected parties.
14. Discharge capacity through the railroad embankment is grossly
inadequate.
1 15. Additional capacity must be provided to keep the water surface
north of the railroad embankment about two feet below critical
' building elevations.
16. Preliminary cost for design and construction of the new Prison Pond
' outlet is $70,000.
17. Preliminary cost for design and construction of the new outlet
through the railroad embankment is $125,000 to $185,000.
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Middle St. Croix River Watershed Management Organization Page 2
Recommendations
In considering the foregoing conclusions, it is recommended that:
1. The MSCWMO develop an operation and maintenance manual for
Perro Creek.
2. Hydrologic and hydraulic models developed as part of this study be
used to assist in the management of the Perro Creek minor
watershed.
3. County Road 21 be raised to a minimum elevation of 750.0 to add
storage capacity to the Prison Pond.
4. The MSCWMO review the need for flood easements at the Prison
Pond and along Perro Creek.
5. Construction of the Prison Pond outlet be completed as part of
County Road 21 reconstruction.
6. The MSCWMO consider initiating a detailed study for increasing the
410 discharge capacity through the railroad embankment.
7. If the MSCWMO decides to pursue improvements proposed herein,
they apply for flood hazard reduction matching grants.
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Middle St. Croix River Watershed Management Organization Page 3
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Introduction
I Purpose and Authorization
Flooding along Perro Creek in the City of Bayport is identified as one of
the Middle St. Croix River Watershed Management Organization's
I (MSCWMO) main concerns. That concern led to the establishment of a
plan to solve the flooding problems. Part of that plan included a
preliminary hydrologic study to access the magnitude of the problem
I which was completed in 1988. Culvert capacities along the creek were
determined to be inadequate based on the 1988 study data, resulting in
recommendations to replace many of the culverts along Perro Creek. The
I preliminary model also indicated that flooding of buildings adjacent to
Perro Creek was likely in three locations. The cost to make improvements
to solve the flooding problem based on the 1988 study, though not
specifically quantified, were detailed study be pe enormous. In gormed toht of a mprovefact,
Ehe
H
I
recommended that a more
watershed model and hopefullyCreek Watershed is shown hown on Figure 1and cost of the �n the
uired
I improvements. The Perro
Appendix.
In 1992 representatives from Washington County met with members of the
I 0 MSCWMO to discuss the County's plan for reconstruction of County Road
21 from County Road 14 on the south to County Road 28 on the north.
This section of roadway encompasses the outlet for the prison pond which
I is the headwater for Perro Creek. SEH prepared a scoping document in
mid-1992 to assist the MSCWMO in determining which project options
should be addressed in a detailed study. Scope of work for the study was
finalized in early study1993. In late in order to993 the address flooding Oalonlg Perro Creek.
I
rected SEH to
proceed with this
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Middle St. Croix River Watershed Management Organization
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Method of Analysis
The following information was utilized during preparation of this report:
Background Information ton Soil
A. MSCWMO Water Resource Inventory dated 1986 by Washing
and Water Conservation District.
B. U.S. Geological Survey, Stillwater Quadrangle, Revised 1993.
C. Topographic Mapping by Mark Hurd for the Middle St.Croix WMO,
based on April, 1993 aerial photos.
D. Record and Preliminary Construction Drawings.
1. City of Stillwater
2. City of Oak Park Heights
3. City of Bayport
4. Washington County
5. Minnesota Department of Transportation
6. Minnesota Correctional Facility
E. Perro Creek Study,Bayport,MN.,by SEH,dated November 8, 1988.
F. Soil Survey of Washington and Ramsey Counties in Minnesota,
dated April 1980.
United
States,
R
infall Frequency
las of the
S
G. Technical Paper 40, .S.Departmenttof Agriculture dated May
SoililConservation Service,
1961.
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Middle St. Croix River Watershed Management Organization
4110
Hydrologic Cycle
Precipitation, evaporation, transportation, infiltration, runoff streamflow,
and storage are all part of the complex hydrologic system(see Figure 2 in
the Appendix). The hydrologic system for the Perro Creek Minor
Watershed includes ponds,ditches,storm sewers and culverts. Evaluation
of system requires consideration of hydrology,hydraulics,climatology and
surficial geology. Climatology and surficial geology are not addressed in
this document. Information on the climatological data used in this study
can be found in Technical Paper No. 40, Rainfall Frequency Atlas of the
United States, Soil Conservation Service, U.S. Department of Agriculture.
Information on the surficial geology used in the study can be found in the
Water Resources Inventory section of the MSCWMO Surface Water
Management Plan.
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Middle St. Croix River Watershed Management Organization Page 6
4111111
Existing Conditions
The Perro Creek Minor Watershed consists of about 1,671 acres of rural
and urban land use. Figure 1 in the Appendix provides in general detail
information on land use within the Watershed. Photo Nos. 1 through 18
in the Appendix depict conditions along Perro Creek.
Urban Watershed Analysis
An urban watershed is one in which surfaces that were rural in nature
become developed and these impervious surfaces cover a considerable
area. Impervious surfaces include roads, sidewalks,parking lots and roof
tops. Natural flow paths in the watershed may be replaced or
supplemented by paved gutters, storm sewers, or other elements of
artificial drainage.
The objective when dealing with urban hydrology is to provide flood
control at all locations within the drainage system. The analytical
problems that must be solved to address these objectives are the
prediction of runoff peaks, volumes and discharge versus time curves
(hydrographs) anywhere in the drainage system.
Urbanization increases runoff due to reduced infiltration and decreased
travel time. Runoff is determined primarily by the amount of
precipitation and by infiltration characteristics related to soil type, soil
moisture, antecedent rainfall, vegetative cover, impervious surfaces, and
storage. Travel time is determined primarily by slope,length of flow path,
depth of flow, and roughness of flow surfaces. Peak discharges are based
on the relationship of these parameters and on the total drainage area of
the watershed, the size of the development, the effect of ponds and
wetlands,and the time distribution of rainfall during a given storm event.
The Soil Conservation Service (SCS) methods were used to analyze both
the urban and rural characteristics of this hydrologic system. The analysis
is comprised of four major components: rainfall,runoff, time parameters,
and peak discharge, hydrographs, and storage effects.
Rainfall
Several rainfall parameters are considered in using the SCS design
methodology. The duration (how long it rains), rainfall depths (how
much it rains), time distribution (how the total rainfall depth is
determined over the duration of the rainfall event),and recurrence interval
(how probable it is that the rainfall event will recur in a given year) are
important factors. One rainfall event was analyzed as part of this study.
This event was 24 hours in duration with a total rainfall depth of 5.9
inches.
Middle St. Croix River Watershed Management Organization Page 7
The design storm (DS) was used to determine the rates of discharge,
runoff volume, and water surface elevations. An SCS Type I storm is
used with the DS.
The 5.9 inches of rainfall in a 24-hour period is referred to as a "100-year
' event". The term"100-year" is often called the return period or recurrence
interval of a storm event. The return period is related to the probability
of a given event being equal or exceeded. The probability that the "100-
year event" will be exceeded in a given year is 0.01 or 1%. A 5-year and
10-year event was simulated on the watershed to determine the peak
water surface elevation in the Prison Pond (0-22) during more frequent
events as requested by the Minnesota Department of Natural Resources
(MDNR).
Conventional wisdom holds that if a 100-year event occurs in one year,
' then it cannot occur for another 100 years. This belief is false because it
implies that rainfall occurs deterministically rather than randomly.
Because rainfall occurs randomly,there is a finite probability that the 100-
year event could occur in two consecutive years. Thus, the excedence
probability concept is the best way to express rainfall events.
Runoff
To estimate runoff from rainfall,SCS uses the Runoff Curve Number(CN)
method. Determination of the CN depends on the watershed's soil and
cover conditions, which the model represents as hydrologic soil group,
cover type, treatment, and hydrologic condition.
The cover condition, or type of land use, is typically expressed by a
percentage of impervious or hard surface area (roof tops, parking lots,
etc.). The CN (or runoff coefficient) is directly related to runoff. The
' greater the impervious area,the higher the CN and the more rainfall that
will drain off of a property rather than soaking into the soil.
111
Time Parameters
The initial time parameters used in SCS methodology are the time of
concentration (Ta) and travel time (Ti). Tc is the time it takes for runoff to
travel to a point of interest (usually time outlet or waterbody of a given
watershed) from the hydraulically most distant point. Tt is the time it
takes for runoff to travel in a given flow segment. T,, is the sum of Tt
' values for various consecutive flow segments.
1
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Middle St. Croix River Watershed Management Organization Page 8
I.
' Model Development
The Hydrocad version of the TR-20 computer program determines peak
' rates and volume of runoff based on given rainfall data in the form of a
hydrograph. The runoff is routed through the drainage system which
includes ditches, storm sewers, and storage basins. The storage basins
' have specific elevation/storage/discharge relationships. These
relationships are used for determining the resulting flood elevations. The
program compares the rate of water entering a basin to the rate of the
1 water leaving the basin. Excess volume is detained or temporarily stored
until the rate of discharge is equal to or greater than the rate of inflow.
The program determines the resulting high water elevations based on the
elevation/storage relationship.
Computer simulation of the hydrology for the Perro Creek minor
' watershed have been prepared to address the MSCWMO's concerns. Six
new versions of the watershed model were developed to simulate varying
conditions including the following:
1. Existing Conditions, 1988 Model
/11111 2. Existing Conditions, 1994 Model
3. Raise County Road 21
4. Divert Runoff North of T.H. 36
5. Determine Non-Contributing Sub-watersheds
6. 5-year Event, Prison Pond Peak Water Surface
1 7. 10-year Event, Prison Pond Peak Water Surface
Models 1 through 5 are based on a 100-year, 24-hour DS with AMC=2
' (normal soil moisture conditions). Models 6 and 7 are also based on a 24-
hour event with AMC=2. All of the models are based on a normal pool
elevation for the St. Croix River at 676.0 (1929 Datum) and a pool
elevation of 744.6 for the Prison Pond.
1141
Middle St. Croix River Watershed Management Organization Page 9
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' Model Discussion
I
Model 1
Model 1 was simulated as part of the 1988 Preliminary Study. Review of
the results from that simulation shows that the existing culvert capacity
' through the railroad embankment is grossly inadequate. The high water
elevation just north of the railroad embankment was predicted at 693.6.
This water elevation would cause flooding in at least five adjacent houses.
I There were also other areas long the creek where a potential of flooding
existing based on this model. Discharge rates along Perro Creek are
summarized on Figure 3 in the Appendix.
IModel 2
Authorization for the Detailed Study by the MSCWMO specifically
I included updating the existing conditions model for the watershed.
Development of this model included the methodology described in the
Method of Analysis section of this report. Key information for
determination of the watershed's characteristics was generated from the
Itopographic mapping developed for this study, which more accurately
defined the contributing areas.
MD Once definition of the model was complete, the watershed was subjected
to a 100-year design storm rainfall of 5.9 inches. Peak discharge (flow)
along the creek is shown on Figure 4. Comparison between Model 1
I (1988) and Model 2 (1994) shows an overall reduction of discharge except
for Point "A". Most notable are the reductions at Point"D" and "E"which
are 84 cubic feet per second (cfs) and 90 cfs respectively. The reduction
I of flow when comparing Model 1 to Model 2 is 35%and 28%at Points"D"
and "E" respectively. This reduction of flow can be attributed to the
greater level of detail provided by the watershed mapping.
IModel 2 indicates water will pond at various locations along the creek in
a 100-year design storm. This information was compared to the 1972
I
district court injunction against the City of Bayport. Some of the same
properties flooded in the 1960's will be inundated in a 100-year design
storm. However,the worst flooding will occur in the east half of Block 91.
I This fact left us in a quandary since none of the property owners in the
east half of Block 91 joined in the 1972 dated lawsuit. Research by the
Bayport city staff provided an answer to our dilemma. Houses located in
the east half of Block 91 were not constructed until after the flooding has
Ioccurred. The areas flooded and included in the injunction dated
January 22, 1972 are shown on Figure 5 in the Appendix. If a 100-year
I design storm occurs over the Perro Creek Subwatershed, flooding of
four or five houses just north of the railroad embankment will likely
me
Middle St. Croix River Watershed Management Organization Page 10
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'NW
occur under existing conditions. A portion of this information is shown
Figure 5.
Ion
Model 2 predicted a water surface of 691.0 north of the railroad
embankment. Ground surface at the houses in this area ranges from 690.8
' to 692.8. Water surface elevations along the creek are addressed in the
Water Surface Profile Model section of this report.
I
Model 3
Model 3 was developed to determine the impact of raising County Road
21. Peak discharge at Points "A", "B" and "C" on Figure 6 are lower than
I those of the existing conditions, Model 2. However, peak discharge at
Points "D" and "E" are similar to those shown in Model 2. This indicates
that the downstream subwatershed area is controlling the peak versus the
I
upstream subwatershed. The peak water surface elevation in the Prison
Pond for Model 3 is 0.6 feet higher than for Model 2.
I
Model 4
Model 4 was developed to determine the future impacts of diverting
runoff generated north of Highway 36 out of the Perro Creek
le Subwatershed. Representatives from Mn/DOT indicated it may be
possible to complete the diversion with reconstruction of Highway 36 to
accommodate the river bridge. This model also includes a raised roadway
I profile on County Road 21 from Model 3. Peak discharge at Points "A",
"B" and "C" on Figure 7 are reduced somewhat. However,peak discharge
at Points "D" and "E" is similar to that shown in Models 2 and 3.
1 Model 5
Model 5 was developed to determine which subwatershed areas do not
contribute/discharge into the Perro Creek drainage system. Three areas
Iwere identified as possible non-contributors from the results of Model 2.
Those three areas are identified on Figure 8 as OBT-15, BTBP-28, and
I OBT-12/OBT-13/BTO-14. Based on the results of Model 2, a starting
water surface was established for the pond in each of the three areas. The
entire subwatershed was then subjected to a 100-year design storm. Area
I OBT-15/OBT-13/BTO-14 did contribute/discharge into the drainage
system tributary to the Prison Pond. The large storage capacity provided
in the Prison Pond dampens the affect of discharge from OBT-12/ OBT-
13/BTO-14 such that they have little impact on the peak water surface or
I
discharge.
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Middle St. Croix River Watershed Management Organization Page 11
Models 6 and 7
Models 6 and 7 were developed to address fluctuation of the water surface
' in the Prison Pond during more frequent rainfall events as requested by
the MDNR. Fluctuation during the 5 and 10 year events are 2.4 feet and
3.0 feet respectively. A representative from the MDNR indicate they have
no problem with this fluctuation.
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Middle St. Croix River Watershed Management Organization Page 12
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' Water Surface Profile Model
I Hydraulic analysis along Perro Creek from Fifth Avenue North to the
railroad embankment was performed using Boss version of HEC-2. The
HEC-2 water-surface profile computation computer model was developed
I by the U.S. Army Corps of Engineers. Use of this model made it possible
to develop a water surface profile (depth) along the majority of Perro
Creek.
I Cross-sectional information for the creek was developed from the contour
mapping and 1988 survey data. Hydrology for use in the HEC-2 model
I was developed as part of this study. Discharge data generated in the
hydrology model(s) at various locations along the creek was used to
produce a continuous water surface based on the channel geometry.
I Two water surface profiles are provided on Figure 11 in the Appendix.
They represent flow conditions.
1 1. Existing conditions, Model 2 (1994).
2. Raise County Road 21 with new outlet at railroad embankment,
MO
Model 3.
The existing conditions water surface profile shows that a number of
I streets as well as the railroad embankment is overtopped. A water surface
elevation above the railroad embankment will likely cause flooding of
adjacent structures. This condition also raises the water surface profile
1 upstream.
Construction of a new outlet through the railroad embankment and
I raising of County Road 12 will have positive impacts. Construction of the
new outlet through the railroad embankment lowers the water surface and
reduces the threat of flooding. Flow characteristics through the structure
I shown on Figure 10 in the Appendix were used to develop the lower
water surface profile. Raising the roadway surface on County Road 21
lowers the water surface profile in between Points A and C shown on
Figure 6 in the Appendix.
IThe areas where flooding may occur are shown on Figure 5 in the
Appendix.
I
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Middle St. Croix River Watershed Management Organization Page 13
' Perro Creek Minor Watershed Management Possibilities
' Development of the hydrologic and hydraulic models provides a greater
opportunity for effective management within the Perro Creek
Subwatershed. This particular watershed includes parts of four
governmental jurisdictions, namely Baytown Township and the cities of
' Bayport, Oak Park Heights and Stillwater. Prior to development of the
MSCWMO Joint Powers Agreement, a forum did not exist where all the
members of the Watershed met to discuss intercommunity surface water
' flow issues. Development of the MSCWMO and its WMO plan were the
first major steps in effective management of the entire watershed,
including that of Perro Creek. The purpose of the MSCWMO Plan is to
provide a local mechanism to reduce capital expenditures necessary to
control excessive volumes and rates of runoff, prevent flooding and
erosion, promote groundwater recharge and secure other benefits
associated with proper management of surface water. The models
developed as part of this study allow assessment of the concerns identified
in the MSCWMO's Watershed Management Plan. These concerns may
stem from intercommunity as well as intracommunity flow issues. Here
are a few examples:
Example
The cities of Oak park Heights and Stillwater decide to divert surface
water runoff generated north of Highway 36 directly to the river. Impact
on the discharge at the Prison Pond can be found by comparing Model 2
and Model 4.
Example
An industry is interested in locating in Baytown Township.
Approximately 100 acres of agricultural land would be converted to
buildings and parking lot. How would this land use change affect the
water surface elevation and discharge from the Prison Pond? Modification
of the model(s) would be made to simulate the revised land use. The
watershed would then be subjected to the design storm to determine the
extent of the impacts. If significant impacts occur,recommendations could
be made for modifications to the onsite detention.
1
Middle St. Croix River Watershed Management Organization Page 14
1
Example
Two property owners within the City of Bayport would like to add 5 feet
' of fill in their adjacent lots. However, the proposed fill area is used for
storage of water during a design storm. Should the filling be allowed,and
if so, what are the impacts? The hydrologic and/or hydraulic model
would be revised to represent the proposed changes and analyzed to
determine the extent of the impacts. It is possible the filling could be
allowed with modifications to one or more downstream structures.
These are only a few examples of how the study models can provide part
of the "Management" in Watershed Management Organization.
I
1
1
1
1
1
Middle St. Croix River Watershed Management Organization Page 15
1
lAik
Maintenance Plan
Development of a coordinated maintenance plan along Perro Creek is key
to its successful management. All of the existing and proposed structures
along Perro Creek were analyzed for full flow capacity. The build-up of
sediment and debris in these structures can significantly reduce their
discharge capacity. A reduction in the discharge capacity results in higher
water elevations which could mean localized flooding. In order to reduce
the flooding potential a regular coordinated maintenance routine should
be established. We suggest that as a minimum the following parties be
involved, as follows:
1 1. Washington County
A. County Road 21
B. County Road 14
2. Minnesota Correctional Facility
A. Area between County Road 21 and County Road 14
3. City of Bayport
4. Chicago and North Western Railroad
A. Culvert/outlet through the railroad embankment
5. Minnesota DNR
A. Operation of Prison Pond outlet
6. Mn/DOT
A. Box culvert at Highway 95
Maintenance/operation of Perro Creek during the winter months has been
a challenge for the City of Bayport. Minor flow/leakage at the Prison
Pond outlet causes a build-up of ice downstream. The 4' x 8' box culvert
at Fourth St. N./Highway 95 was almost completely full of ice in January
of 1994. Had this box culvert become plugged, a number of structures
may have been threatened with flooding,including a school. In early 1994
the City of Bayport expended approximately$15,000 to control the Prison
Pond discharge and resulting build-up of ice. Development of a solution
to the ice problem was not in the scope of this study.
Middle St. Croix River Watershed Management Organization Page 16
1
I
1 PI P
Improvements
Two major improvements required along Perro Creek have been
Iidentified. They are specifically reconstruction of the Prison Pond outlet
and increasing the discharge capacity at the railroad embankment. The
Ifollowing text addresses each of the proposed improvements.
Reconstruction of the Prison Pond Outlet
The existing outlet for the Prison Pond is located just west of County Road
I21 and shown on Photo No. 1 in the Appendix. Structural components
consist of one-half a 6 foot diameter corrugated metal pipe (CMP) on end
fitted with a metal plate. Flow from the pond enters the structure through
I a rectangular orifice in the plate measuring 1.7 feet wide and 1.2 feet high.
Movement of the slide gate attached to the metal plate allows the orifice
Itobe closed. However,the seal is not water tight and leakage does occur.
A short row of sheet pile extend north and south from the existing
structure to provide stability and a seepage cutoff. Flow entering the
I outlet structure is directed east across County Road 21 by a 42 inch
diameter CMP.
MO A number of concerns have been expressed about the condition of the
existing structure. During the 1993/1994 winter leakage through the
outlet structure worsened the ice build-up downstream. Once the flow of
water through the structure was stopped water could be heard moving
I under or around the structure. This raises an additional concern that the
structure is slowly being undermined.
I The elevation top of the existing structure is 748.0. County Road 21 will
be raised to a minimum elevation of 750. Therefore, the existing structure
does not maximize the storage capacity in the Prison Pond for winter
Ioperation.
A preliminary layout of the proposed Prison Pond outlet is provided on
Figure 9. This structure provides a discharge capacity similar to that of
Ithe existing outlet. It also provides a 3-foot wide set of stoplogs to allow
for drawdown of the Prison Pond. This drawdown feature would be used
to simulate a drought as requested by the MDNR. However, stoplogs are
known to leak. For this reason we have also included a slide gate to seal
off the flow through this structure for winter operations. The grating
I covered opening on top of the structure is sized to handle the entire
design flow discharge should the remainder of the structure become
inoperable due to debris such as trees or ice.
I
ell) .
Middle St. Croix River Watershed Management Organization Page 17
t
Outlet Through Railroad Embankment
Discharge capacity through the railroad embankment is grossly
inadequate. The water surface elevation just north of the railroad
embankment during a design storm is predicted to be about 691. A water
surface elevation of this magnitude will flood a number of houses. Photos
No. 14 and 15 show the existing 48-inch reinforced concrete pipe through
the embankment. The pipe has a discharge capacity of 119 cfs with an
upstream water surface of 691.
' Additional capacity must be provided to keep the high water surface
north of the railroad embankment about 2 feet below the critical building
elevation. Two 48-inch diameter RCP and one 60-inch diameter RCP
would provide a capacity of 207 cfs at elevation 688.2. This means two
additional pipes need to be installed through the embankment.
Appropriate modifications to the channel would also be required. Even
with this improvement, two swimming pools would be flooded. Storm
water ponding easements would likely be required. Proper operation of
this system is dependent on developing a maintenance routine to keep
idebris from reducing the discharge capacity.
I
1
1
I
1
Middle St. Croix River Watershed Management Organization Page 18
I
li
Improvement Costs
Improvement
costs provided in this section
onlion should not be used for
p The are includY
to provide a general
budgeting purposes. Y
magnitude of the cost involved.
Reconstruction of the Prison p Pond O tl outlet is shown on Figure 9.
et
1 �A preliminary layout for the Prison
ton County to develop a detailed
SEH is presently working with Washingion,the estimated cost fr
structure design. Based on our present inf t of the exi ting outlet is
1 construction of the new outlet and removal
$70,000. Figure 9 has been submitted to the MDNR for comment.
Outlet Through Railroad Embankment
A preliminary layout for the outlet through the
necessary to workembankment
withins
It w
showne n Figure ci0 in the Appendix.
the Canadian Pacific (CP) and Chicago and North Western (CNW)
Railroad rights-of-way to construct this outlet. Prelim na contact
has
been made with the railroads to deterne whatnu
would be acceptable. The CNN indicatedhagreement.have
to
However,use
ir the r
le forces to construct the outlet due to a union
crews are busy they would allow the MSCWMO's contractor
to build
jacking
the
project. The possibility of open cutting theembankmentversus
cutting the
the pipes through the embankment this work also
eine forOpthe weekeand
d.
embankment may be possible between the MSCWMO
Prior to initiating this work, an agreement
railroad(s) would be required.
Based on our present data we esti priore ht e corutiatings construction we
project to range
between $125,000 and $185,000.
recommend a detailed study of the ° et area wouldbe fbenrequirTlais study
would define specifically what improvements
Cost for the diversion of runoff north of Highway 36 is not addressed in
this report.
Cost Allocation
Cost allocation between the minorbeen based onershed community ace scoping
ge
studyand minor watershed study hasacreage on
community g
The following chart summarizes the contributing
aercentage basis. Breakdown of the costs for the improvements have
p
not been included at this time.
I
Page 19
Middle St. Croix River Watershed Management Organization
1
EDSUMM
I SUB WATE RSF,..._..--......... 1Y ..
ILSUBWATERSHED TOTAL 1 611U-WATER OAK PARK HGHTS. BAYTOWN BAYPORT
ACREAGE ACREAGE _ ACREAGE ACRF_AGE ACREAGE
/MP ST-1 12.98 12.98
II SO-2
0-3 28.15
26.67 1.48
34.44
34.44
0-4 14.14 14.14
0-5 17.44 17.44
SO-6
0-8 22.05 43.99
10.78
• 33.21
0-7 40.60
40.60
22.05
0-9 7627 76.27
0-10 32.54 32.54
0-11
36.12 36.12
OBT-12
35.61
32.02 3.59
OBT-13 33.11 31.70 1.41
MO-14 167.27 3.57 163.70
BT-15 59.32
0I3T-151 30.25
59.32
NOMPIN.414 EVESSO
50.94 NO DISCHARGE
0-16 50.94
0-17 53.69 53.69
0-18 51.18 51.18
0-19
44.31 44.31
OBT-20
85.81
46.33 39.48
0-21 44.34 44.34
BP-23
0-22 45.97 45.97
BP-24 37.59 37.59
BP-241 7.75
17.18 7.75
17.18
BT-25 21.39 21.39
BT-26 9.529.52
BT-27
9.10 9.10
13TBP-28
52.89
fg-,VT .,4•rfingaga NO DISCHARGE
BPBT-29 86.30
4.b4 82.26
BT-30 53.97 53.97
BT-31 98.64 98.64
V40 BM-32
BP-33 12.00
120 10.80
2.65
265
BP-34 8.34 8.34
BP-341 12.87 12.67
BP-35
BP-351
30.32
6.87
30.32
6.87
BP-36 26.45
26.45
BP-37 11.16 11.16
BP-382.60
BP-39 2.85 2.85
BP-40 2.60
7.19
7.19
BP-41 22.30 22.30
BP-42 35.75 35.75
.
BP-43
BP-44
BP-45 12..47
9.62
834 12.47
9.62
8.34
BP-46 2.73 2.73
IIIBP-47 2.20 2.20
SUBWATERSHED
TOTAL 1671.56 , 1
i ACREAGE
TOTAL ._ 1
STILLWATER OAK PARK HGHTS. BAYTOWN BAYPORT
commuNn 50.43 728.1 467.07 425.96
ACREAGE
CONTRIBUTING
COMMUNITY 50.43 425.35 400.3
. ACREAGE
iiii CONTRIBUTING
r PERCENTAGE
ITY
, WM 26.78% 25.20%
BY COMMUN
Middle St. Croix River Watershed Management Organization Page 20
I
I
IIA
1:I.
Funding p for funding of
There are a number of means reek.ilTheefollowto i g Mis br of explanation of
I
improvements along Perro
those means.
1 1. Taxing District
Development of a subwatershed taxing
Statute Section
ct is addressed in the
implementation program for Perro
103B.245 and 103B.251 allow for development watershed management
special tax
district and capital improvementsby
organizations.
2. Surface Water Managementconsiderty the establishmentv` of SWMV. This
Each community could At about
V)
funding source could take up to a year to develop.
1 $12/homeowner per year, with hitigher �e a revenue bond.
ns from business
and commercial properties,the u ty could finan
There are some advantages and disadvantages that deserve
1 consideration.
Advantages
M 1. Properties causing or contributing to the need for runoff
management pay into the utility.
2. The change is directly proportioned to runoff generated by
1
specific class properties.
3. A self-financing system is not in competition with general
services funds.
4. Existing and new developments both pay.
5. The system is flexible.
I6. The utility provides a continuous source of revenue.
7. It provides a specific dedicated fund for surface water
management.
The administrative structure for collecting fees is usually in
1 8. place.
I
1111.
Page 21
Middle St. Croix River Watershed Management Organization
1
I
111 Disadvantages
1. Some initial costs are encountered in developing the rate
formula and philosophy.
I
2. The utilitymay require an expanded administrative
structure including establishment of a billing system if none
I
currently exists.
There are at least 20 communities in the metro area using storm water
Iutilities to fund improvements.
3. Minnesota Department of Natural Resources (MDNR)
A. Flood Hazard Mitigation Grant Assistance Program
B. Flood Hazard Mitigation Grant Bond Program
cal
These monies are available on a 50 percent
stfunds state/50
percent
he program.basis
A
provided the state legislature appropriates
representative from the MDNR indicated
did mdicatteeor no that theoM�WMO
I be available in 1994. The MDNR
111111 should update the costs associated with the related projects and apply
for 1995 grant monies.
4. General Taxes
With the high level of competition for the general tax dollar it may be
difficult to rely on this funding source.
I
5. Washington County
A representative from Washi theoP sonsty Pond suggoutlet ested that
discussi
priorr to
s
regarding cost sharing on
development of detailed plans and specifications.
I
I
I
NWN
. Page 22
Middle St. Croix River Watershed Management Organization
I
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PERRO CREEK EXISTING OUTLET @ PRISON POND
„di Am.- EH
PHOTO #1
a
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Ili
PERRO CREEK LOOKING DOWNSTREAM FROM CO. RD. 21
I \PHOTO #2 AiLlirirsai i
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I
PERRO CREEK LOOKING UPSTREAM FROM NINTH ST. NO.
PHOTO #3
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I
PERRO CREEK
vPHOTO #4
N. RESIDENCE AT 796 SECOND AVE. NO.
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I
PERRO CREEK LOOKING UPSTREAM FROM SIXTH ST. NO. .Efl
/ID PHOTO #5
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II
1PERRO CREEK N. SIXTH ST. NO. BOX CULVERT
PHOTO #6
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