HomeMy WebLinkAbout9.a. Review of Carrollton IV Drainage . CITY OF ROSEMOUNT
EXECIITIVE SIII�lARY FOR ACTION
CITY COUNCIL MEETING DATE: APRIL 5, 1994
AGENDA. ITEM: Review of Carrollton IV Drainage AGENDA SECTION:
Old Business
PREPARED BY: Bud Osmundson, P.E. AGENDA N���■ � � � �
City Engineer, Assistant Public Works Director �V�
ATTACI�SE`�TTS: Handskom Letter, DNR Water Talk APPROVED BY:
and Feasibility Report
At the December 21, 1993 the Carrollton Fourth drainage concerns were discussed by neighborhood
residents and the City Council. This issue was previously discussed at a Utility Commission meeting in
September and November of 1993. At the December meeting, Staff was authorized to prepare a feasibility
report addressing the drainage concerns. OSM has now prepared this report which is attached.
OSM has found that the existing storm drain system within the Carrollton Fourth Addition is adequate to
accommodate a 100 year, 24 hour rainfall event. However, at this time there is an outlet to collect water
from the adjacent Edwin Rahn additions to the east which could over burden the Carrollton Storm sewer
system. If this pipe is plugged from the Rahn Addition pond immediately east of the 4th addition, this pond
could overflow into the 4th addition and again could overburden the storm drain system. This could cause
water damage to homes in the 4th addition. This could happen with a 100 year, 24 hour rainfall event.
The engineering recommendations are that the Rahn Addition Pond be expanded as much as possible at its
current site and that an additional pipe be constructed from the Carrollton Fourth Addition southerly across
CSAH 42 and down to 0'Leary's Pond. The estimated cost of this new pipe is 595,000.
Since the Carrollton Second, Third and Fourth Additions were designed and graded as a "dish" with no
available overland emergency outlet, it seems the City has no choice but to order the installation of this
new outlet pipe to O'Leary's Pond. Since the storm drain system within the Carrollton Additions is deemed
adequate for a 100 year, 24 hour event, this new outlet pipe is really to serve any overflow from
surrounding areas, which would be considered a trunk cost. Therefore, this funding for this additional pipe
would come out of the storm core fund. One problem with this proposed pipe is that it would be installed
premature to development. It is possible that this pipe may be relocated or totally abandoned when that
area south of CSAH 42 develops. The only other option is that Council could leave the situation as is and
complete the minor expansion of the Rahn Pond, but the Council should be prepared to address flooding
concerns from the Carrollton Fourth neighborhood in the future. Therefore, Staff recommends that Council
authorize that a feasibility report be completed for this outlet pipe so that further details can be
summarized. This would be brought back to the Council in one month. At that time Council could order
the preparation of plans and specifications:. This timetable would allow the completion of the project within
90 days of today.
RECOMMENDED ACTION: Motion to adopt a resolution to authorize Staff to prepare a feasibility report for the
completion of an additional outlet pipe to the Carrollton Fourth Addition.
COUNCIL ACTION:
7
Carrollton 4th Addition Drainage Study
Executive SummarX
The City of Rosemount staff has received complaints from the residents living in Block 3,
Carrollton 4th Addition, relating to high water levels and standing water after rainfall events
in their backyards.
The plats and grading plans for Carrollton Addition provide for linear ponds in the backyard
areas and these ponds have been designated WAC 186A in the City of Rosemount's
Drainage Plan (1989). Located to the east of Carrollton 4th Addition is the Edwin Rahn
Addition Pond (WAC 188D). The City Drainage Plan delineates that the outlet from the
Edwin Rahn Addition Pond be to the east and across Chippendale Avenue, however, the
eacisting outlet for this pond is to the west and into the Carrollton 4th Addition storm drain
system. The existing storm drain system has the capacity to accommodate the 100-year, 24-
hour rainfall event if the tributary area includes only the Carrollton Additions. If the 24
acres within Edwin Rahn Addition are included in the tributary drainage area, which is the
current situation, the existing storm drain system does not have adequate capacity to
accommodate the 100-year, 24-hour rainfall event.
In order to provide 100-year, 24-hour flood protection for the existing homes in Carrollton
4th Addition and to improve the backyard drainage, we recommend constructing a gravity
outlet from the backyards of Block 3 to the south across C.S.A.H. 42 and into O'Learys
Pond (WAC 203A). In addition to providing 100-year flood protection, this outlet would
provide an additional safety factor for the Canollton Addition storm drain system which
does not have an emergency overflow outlet. The estimated cost for the construction of this
recommended alternative is $95,000.
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Socltelen
Mayeron&
Assoaa�es,Inc.
300 Park Place Center
5775 Wayzata Boulevard
March 31, 1994 ��pov�,MN 55416-1228
612-595-5775
1-800-753-5775
FAX 595-5774
Engineers
Mr. Bud Osmundson ,�.�n,te�c�
Ci�/ Of ROSeIII011IIt Planners
Surveyors
2875 - 145th Street West
Rosemount, MN 55068
Re: Carrollton 4th Addition Drainage Study
City of Rosemount
OSM Project No. 5414.00
Dear Mr. Osmundson:
It is our understanding that the City of Rosemount staff has received complaints from
residents having backyards in Block 3 of Carrollton 4th Addition relating to high water
levels and standing water after rainfall events. The City of Rosemount is concemed about
the resident comments and the possible flooding in this area, and has requested that OSM
& Associates prepare a study of the backyard drainage in Block 3 of Canollton 4th
Addition.
GENERAL BACKGROUND
The purpose of this letter is to provide you with the results of the study. The study included
the following:
l. A hydrological/hydraulic analysis of existing storm drainage system.
2. The development of improvement altematives for correcting backyard
drainage problems which include concerns related to flooding and standing
water.
Information that was used to complete this study included:
A. Correspondence from the residents of Carrollton 4th Addition.
B. Topographic Information including proposed grading plan, actual field survey
information of Block 3, Canollton 4th Addition, and Dakota County GIS
Mapping.
C. Record drawings relating to the existing storm drain system.
D. Drainage Plan for West Drainage Area (1989)
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Equal Opportunity Employer
Mr. Bud Osmundson
City of Rosemount, MN
March 31, 1994
Page 2
EXISTING CONDTITONS
The existing storm drain system that provides the outlet for the backyards of Block 3 of
Carrollton 4th Addition is also the outlet for the majority of Carrollton's 2nd and 3rd
Additions, the Edwin Rahn Addition (including one pond) and a portion of Broback 10th
Addition (see attached Drainage Area Map). Carrollton 4th Addition is located in the
Wachter Pond Drainage District as delineated by the City of Rosemount's Drainage Plan
for the West Drainage Area(1989). The e�cisting linear ponds located in the rear yaxd areas
of the Canollton Additions are identified in the Drainage Plan as WAC 186A as shown on
the attached Drainage Pattern Map. The plats and grading plans for Canollton 2nd, 3rd
and 4th Additions provide for linear ponds in the backyard areas. The existing low floor
elevation for the homes sunounding the Carrollton 4th Addition stormwater pond is 954.8.
The subdivision drains from east to west and into a trunk storm drain on Shannon Parkway.
Ultimately, the stormwater from this area drains to Wachter Pond. As shown on the
Dra.inage Area Map,the Canollton Addition development is constructed within a depression
which has no emergency overflow outlet to protect the homes in the event the existing storm
drain outlet becomes plugged.
The Edwin Rahn Addition is located directly east of Carrollton 4th Addition.
Approximately 24 acres of the Edwin Rahn Addition are tributary to a pond located on the
eastem boundary of Carrollton 4th Addition which has a 12-inch storm drain outlet flowing
into the Canollton Addition storm drain system. The Drainage Plan identifies the Edwin
Rahn Addition pond as WAC 188D. As shown on the Drainage Pattern Map WAC 188D
was proposed to be outletted to the east across Chippendale Avenue. The e�cisting low flaor
elevation for the homes adjacent to the Edwin Rahn Addition pond is 958.2. The Edwin
Rahn Addition pond is separated from Carrollton 4th Addition by an earth berm (top of
bank elevation 955.8). In the past, the stormwater level in the Edwin Rahn Addition pond
has risen and has encroached onto Cimarron Avenue during critical rainfall events.
According to City staff, the stormwater in the pond drains out completely within a few days
of the rainfall event. This indicates that the underlying soils have a good percolation rate.
The City of Rosemount's Drainage Plan recommends that all trunk storm drains connecting
ponds be designed to accommodate the 100-year rainfall event and that lateral storm drains
be designed to accommodate the 10-year rainfall event. The drainage plan also
recommends that low floor elevations near outletted ponds be at least two feet above the
100-year flood level. The original storm drain design, for Canollton 4th Addition, was
based on a 10-year rainfall event.
We modeled the existing storm drain system and analyzed the 10-year, 50-year and 100-year,
24-hour rainfall events. Table 1 lists the results of this analysis.
H:\5414.00\CI VIL\CORRFS\033194.B0
Mr. Bud Osmundson
City of Rosemount, NIN
March 31, 1994
Page 3
TABLE 1
CARROLLTON ADDITION EXISTTNG CONDITIONS
_ ___ _ __ _ _ .._ _ __ __ _ __ _ ___ _ . __ _ __. ___ ____ __ _ _ _
S,�baat�d<; i�Yr��4-�r�. �Y��?r{-�r�.nfa11:: �oo-Yr::?A-�r Rs�� ::
< Penlc ��►lt.. . I: ;Psalc � X"eatc �Keatc;i ''
;. ,
Naa�ber; � R�no[f ;; Pond ; �t Discllarge Pond : Runet!' ;;;�sclu��e Peml ; '
Dusc�xr�e
���: ���� . (�� xw�,.: �f�).. ��� xwr, x�c�(�) t�) � '
1 24 36.8 8.4 57.1 9S 67.6 l0A !
2 4S 10.1 1.9 954.0 15.b 3.8 955.0 18A 4.9 9555 I
3 5.4 12.1 9.0 N/A 18.7 14.0 N/A 22.1 16.6 N/A 'i
4 3.9 8.8 1.6 9SOS 13S 3.2 952A 16A 4.1 953.2 I
5 4.3 9.7 9.6 N/A 14.9 14.9 N/A 17.6 17.6 N/A �!i
6 3.7 8.3 1.4 451.0 12.8 2.7 9521 15.2 3S 9525 I,
7 3.2 22 7.2 N/A 11.1 11.1 N/A 13.1 13.1 N/A I'�
8 27 6.1 0.8 949.4 9.4 2A 9515 111 2.6 952.0
9 51 11S 11.4 N/A 17.7 17.6 N/A 20.9 20.8 N/A
As shown in Table 1, the existing storm drain system (with the inclusion of 24 acres from
the Edwin Rahn Addition) has the capacity to accommodate the 100-year, 24-hour rainfall
event in Carrollton 2nd and 3rd Additions, however, it does not have adequate capacity to
accommodate the 50-year or the 100-year, 24-hour rainfalT events without inundating the
existing homes in Carrollton 4th Addition.
In addition to the potential for flooding in this area, the residents have expressed concerns
relating to the duration of standing water in the rear yards of Block 3, Carrollton 4th
Addition after rainfall events.
As stated earlier in this letter, the plats and grading plans for the Carrollton Additions
provide for stormwater ponding in the backyard areas. The result of allowing stormwater
to pond in backyard areas is that the turf will remain wet for a period of time after rainfall
events.
The proposed grading plan for the Carrollton 4th Addition shows that a swale was to be
graded in the backyards of Block 3 to drain the area to a low point between Lots 7 and 8
and then outletted to the west by the proposed storm drain facility. A �eld survey of the
existing backyards of Block 3 was completed in the fall of 1993. A comparison of the
proposed and e�sting backyard grading is shown below:
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Mr. Bud Osmundson
City of Rosemount, MN
, March 31, 1994 '
Page 4
< Tarble 3 :::
> <
;:
;:,;..Carr,tillton 4th Addit3on Blacl�3;�rading IntQriu�tion.;
'
�', _:; _; _ _
_
; : ; , _
_ :
;:
'G�a�i�Item iriropose�Gra�ing l�laa E�nsbng�Crad�ng ; ;`
Oudet Elevation Between
Lots 7 and 8 949.6 952.34
Backyazd Slope
Lots 1 - 7 0.7 - 1.2% 0.17- 0.88%
Backyard Slope
Lots? - 17 0.7- 1.2% 0.09 - 1.48%
Table 3 shows that the actual grading in the backyards of Block 3 of Carrollton 4th Addition
was not completed according to the plan.
IMPROVEMENT ALTERNATIVES
As stated earlier, the residents in Canollton 4th Addition are concemed with the
potential flooding in the area and the drainage problem that results in standing water
in the backyards after rainfall events. Improvement alternatives were reviewed for
both of these concerns and are listed as follows:
Flood Protection:
Alternative No. 1 - Plug the existing 12-inch outlet from the Edwin Rahn Addition
Pond to the Carrollton Addition storm drain system. This alternative is not
recommended because the existing Edwin Rahn Addition Pond does not have the
adequate capacity to accommodate the 100-year, 24-hour rainfall event without
flowing over the berm to the west and possibly creating a flooding situation in
Carrollton 4th Addition.
Estimated Prnject Cost = $ 0
Alternative No. 2 - Excavate the Edwin Rahn Addition pond to increase its
stormwater storage capacity to 3.4 Ac-Ft. and plug the existing 12-inch outlet.
Additional survey information is required to determine if the additional capacity can
be obtained. With the 12-inch outlet plugged, the 24 acres in Edwin Rahn Addition
aze eliminated from the drainage area, this alternative will alleviate the storm drain
capacity problem and will provide 100-year flood protection for Carrollton 4th
Addition. Increasing the storage capacity in the Edwin Rahn Addition pond is
necessary to accommodate the critical storm event. However,it is difficult to predict
the pond HWL if no outlet is provided. With this altemative City staff should
monitor the water level in this pond and after rainfall events should pump the
stormwater from the Edwin Rahn pond into the Carrollton Addition pond storm
H:\5414.00\C!VIL\CORRFS\03;i194.B0
Mr. Bud Osmundson
City of Rosemount, MN
March 31, 1994
Page 5
drain system. This alternative is not recommended because of the steep banks that
would be required to increase the pond storage capacity and because of the excessive
depth that the pond would need to be excavated (10+ Ft_).
Estimated Project Cost = $31,000
Alternative No. 3 - F�ccavate the Edwin Rahn Addition pond to increase its
stormwater storage capacity to 3.4 Ac-Ft and construct a 1 cfs stormwater lift station
for its outlet into the existing Canollton Addition storm drain system. We modeled
the 10-year,50-year and 100-year,24-hour rainfall events for this altemative and have
tabulated the results in Table 2.
TABLE 2
CARROLLTON ADDITION PROPOSED CONDITIONS
1 cfs Pamped Outiet From Edwin Rahn Fond
3ubwaterslied 1D Yr,24=Hr Rainfall SQ:Yr,24-Hr Rainfali i00-Yr,24-Hr RainfaII..:
Peal[ ; Peaic : Peak ;I Peah Peak Peak
1�Tuo��er � Runo}f Dt�charge Pond Rnnoif : Disrharge Pond Runotf I?ischargr Pond
;�AF1 I�e�els) ;: (cfs) HVrV1. Itate(c[s) (cfsj HWf, �ate(ttsa (sf&) HK'L
1 ?A 36.8 1.2 954.2 57.1 4.8 9555 67.6 6.4 9565
2 4S 10.1 1.9 953.0 15.6 3.8 953.2 18.4 4.9 9S3S
3 5.4 121 9.0 - 18.7 14A - 22.1 16.6 -
4 3.9 8.8 1.6 950.2 13S 3.2 952.2 16.0 4.1 952.6
5 4.3 9.7 9.6 - 14.9 14.9 - 17.6 1�.6 -
6 3.7 8.3 1.4 951.0 12.8 2.7 952.1 15.2 3S 9525
7 3.2 7.2 '7.2 - 11.1 111 - 13.1 13.1 -
8 2.7 6.1 0.8 949.4 9.4 2A 9515 ll.l 2.6 952.0
9 5.1 11S 11.4 - 17.7 17.6 - 20.9 20.8 -
This alternative will provide 100-year flood protection for Canollton 4th Addition
and the Edwin Rahn Addition, however, as with Alternative No. 2, this altemative
is not recommended because of the steep banks and excessive depth required to
accommodate the additional pand storage required in the Edwin Rahn Addition
Pond.
Estimated Project Cost = $55,000
H:\5414.00\C7 V[L\CORRES\033194.80
Mr. Bud Osmundson
City of Rosemount, MN !
March 31, 1994 �'
Page 6
Alternative No. 4 - Construct a gravity outlet from the rear yard area of Block 3,
Canollton 4th Addition to the south across C.S.A.H. 42 and into O'Learys Pond
(WAC 203A). Additional grading would be required in the backyazds of Block 3 to
route the stormwater runoff to the new storm drain outlet. Routing the stormwater
to the south would require pipe jacking across C.S.A.H. 42. At this time O'Learys
Pond has adequate capacity to accommodate the additional flow from Carrollton 4th
Addition and Edwin Rahn Addition. In the future, as the commercial area on the
south side of C.S.A.H. 42 develops, the additional stormwater runoff from this area
would be considered when designing the ultimate ponding and storm drain systems.
This storm drain outlet to the south from the Carrollton Additions would provide
100-year, 24-hour flood protection for the Carrollton Additions and the Edwin Rahn
Addition. This second outlet would improve the drainage in the backyard axea,
provide flood protection for the ponds and provide an additional safety factor for the
Canollton Addition storm drain system. Therefore, Alternative No. 4 is the
recommended alternative.
Estimated Prnject Cost (C.S.A.H. 42 Jacking Only) _ $95,000
Backvard Drainage:
Alternative No. 1 - Do not improve the backyard drainage. With this altemative the
backyards in Block 3 will continue to have standing water after rainfall events for
periods of time because of the flat slopes draining to the outlet. However, as turf
is established in this area the standing water on the surface will be reduced.
Estimated Project Cost $ 0
Alternative No. 2 - Lo�wer the existing outlet between Lots 7 and 8 and do minor
grading in the backyards in Block 3 to have a constant positive slope to the outlet.
With this altemative the backyard drainage to the outlet would improve somewhat,
however, a typical slope in a turf area that will provide good drainage is 2% and
given the existing conditions, tlus grade cannot be established.
Estimated Project Cost = $3,000
Alternative No. 3 - Leave the backyard grades in Block 3 as is and install drain tile
(see attached detail) along the rear lot line draining to the outlet between Lots 7 and
8.
With this altemative, stormwater runoff in the backyards would drain from the
surface into the drain tile. If the existing outlet is revised to accommodate the
critical rainfall event, this altemative will improve the standing water situation.
Estimated Project Cost = $25,404
x:�saia.aoicrv�L�co��a�i9a.eo
Mr. Bud Osmundson '
City of Rosemount, MN '
March 31, 1994 ,
Page 7 ',
RECOMMENDATIONS
In order to prevent the possible flooding of existing homes in Carrollton 4th Addition and ,
to address the resident concerns regarding the duration of standing water in the backyards, '
we recommend constructing Flood Protection Alternative No. 2: '
- Minor grading in the rear yards of Block 3.
- Construct a gravity storm drain outlet to the south across C.S.A.H. 42 to O'Learys
Pond.
These improvements will provide 100-year, 24-hour flood protection for the Canollton
Additions and the Edwin Rahn Pond and will improve the backyard drainage problem.
However, the recommended two feet of freeboard for the backyard pond in Block 3 cannot
be met.
The existing storm drain system in Carrollton Addition is constructed at minimum grades
a.nd is subject to possible debris settling out in the pipes and creating obstructions in the
system. The residents living in this area and City staff should make it a priority to inspect
the storm inlets and pipes for possible obstructions and to keep the streets and storm drains
clean. This inspection and cleaning effort will reduce the possibility of flooding in the
Canollton Addition ponds.
If you have any questions or comments, please contact me at 595-5694.
Sincerely,
ORR-SCHELEN-MAYERON
& ASSOCIATES, INC.
� �
�i�`'_ � t�i',�„��
X
Brian J. Bourassa, P.E.
Project Manager
c: Pete Willenbring, OSM
nm
H:\5414A0\Ct VIL\CORRES\03:i194.B0
—
' �
�
i' FABRIC OVERLAP �
— COARSE FILTER AGGREGATE (MNDOT
SPEC. 3137 TYPE CA-31 THE AGGRE— �
GATE SHALL BE ROUND RIVER ROEK, ;
WASHED AND FREE OF F 1 NE PART I CLES. .
� �� � �� � � � 6�� TOPSOIL f
• u°�p o�iP ° . . . . . i
FILTER FABRlC WRAP � � INVERT OF DRNN TiLE SHALL
8E EVEN WITH CR BELOW
SAND SUBCUT. i
30" M1 N.
PVC PERFORATEu UNDERDRAIN PIPE EDGE OF DRAIN TILE FABRIC
(MNDOT SPEC. 3245) OF SIZE SHOW TO BE AT EDGE OF STREET
ON PLANS. � SAND SUBCUT AND BEHIND
IN UNSTABLE SOILS FILTER T CURB WHERE APPLICABLE.
FABRI� WRAP TYPE SHALL BE o
SELECTED BY THE SOILS ENGINEER �— 4^
FROM THE FOLLOW(NG. 6"MIN.
2'-0"(TYP.1
FILTER FABRIC WRAP SHALL SECTIONAL VIEW
BE TYPAR 3401, MIRAFI 140N,
PROPEX 4545, FIBRETEX 150,
EXXON NONWOVEN �
tGTF-130EX1, 4M000 NONWOVEN STORM SEWER MANHOLE
�4545), OR APPROVED EQUA� OR CATCH BASiN
PVC BEND OF SAME S12E
45°BEND (TYP.) , AS MA i NL I NE UNDERDRA I N
PIPE—INCIDENTA� TO PIPE
• CONSTRUCTION
P�AN
CONNECTION TO STORM SEWER iI
STRUCTURE SHALL BE AT SPRING INVERT OF DRAIN TILE TO BE DETERMINE �
LINE OR 6"MIN. ABOVE INVERT INFIELD BY DEPTH OF SAND SUBCUT OR �I
ALL GROUTING MUST BE AN APPROVED EXISTING GROUND WATER CONDITIONS.
NON—SHRINKABLE GROUT.
STORM SEWER �� "°�
UNDERDRA 1 N DETA 1 L
DATE FEB. I . f 992
REV. 6/4/92 �
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Drawn By� Drawing Title Comm. No.
P•�•�• Schelen CARROLLTON 4TH ADD I T I ON 5414.80
n Nayeron & DRA I NAGE STUDY
Date• Associates, lnc. Sheet no.
Bn�inee». Arcditects . Plaanen .snr�eyors DRA I NAGE PATTERN MAP
3-30-94 � Park Place Ctnler�S77S lfa�sata Honlevard
Yiaaeapolis,YM 55416-izie. e�z-sas-srra C I T Y OF R 0 S E MO U N T+ MN
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Fall 1993 WATER TALK Pcge 5
Climate Update - Fall, 1993 .
The months of May through August of 1993 wiq be remembe�ed as the wettest pertod in Mtmesota's
recorded climate history.The toRentiai rairu that impacted nearly aU of tt�e Midwest leff many locatfons in
Minnesota wfth precipitation totais exceeding 200 percent of the mean,the equivalent of two summers worth
of rain.Flgure 1 shows ttwt roughly one haif of Minnesota ranked at,or above,the 99tfi�percenflle for Mlay
through August roinfall.A value above the 99th percenttle means tha!those locations broke,or nearly broke, -
aU-time May through August rainfalt reco�ds.Four month totals exceeded 28 inches over much of southem
Minnesota,the normol annuol ra(nfall for many of ihose areas.Record txeoWng rainfall over such o broad area
for such an extended period of time Is unprecedented In Minnesota's 100-year cifmate record.
The same atmospheric conditions tfiat led to the heavy ralns also led to extraordinarily low evaporat(o�
rates.Cioudy and cooi weather,In tandem wfth persistently hfgh relatNe humldlty,combined to dramaflcaAy
reduce the atmosphere's abifity to evaporate water from the surtace.For the flrst time since such records have
been kept,precipitation totais exceeded pan evQporatton values for tlie May ttuough August perlod.'(he lack
of evaporaflon exaggerated an already se�lous hydrologic imbalance.
The most significant rainfali event of the late summer occurred on August 15th and 1 btt�along a I(ne ttwt
stretched from near New Uim to south of Austtn(flgure 2).A multi-county area recefved more than four inches
of precipitotion in this storm.Eight inches of rain or more fell in southem Freebom and Mower countfes.FaUfng
upon aiready saturated ground,ttiis stortn caused wide-spread soil erosion and rura!flooding,as weli as seiious
urban flood(ng in Austtn and elsewhere.
Fortunately,ttie rain slackened in the late summer and earty fall.However,this dry weather was not
accompc�nied by the warm temperatures needed to adequately dry crops and soils.September was one of
the coolest on record,and with some excepflons,October was also quite cool.
At this time,soii moisture levels are very high for nearly all of Minnesota.As the sofl freezes,the soil moisture
status wlii remain generally unchnnged ttuough the winter season.Wetiands,lakes,rivers and streams are aiso
at unusually high levels for this time of year.While it is too eariy to sound tfie alarm,it is important to recagnize
that the potenflal for slgniflcant spring flooding in 1994 dces exist.�
State Climatology Office
May-August, 7993 Precipitation
Historical Ranking
`~ (0=Jeast ever,100=most aver)
� rr» ' � � � � - �
-r-- ..,... Torrenfial Rains Fatl on Soufhern Minnesofa
� �•• �� Augusf i5-16, 1993
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Thls m�p d�pleb wlwr�pr►yy to Auyus¢,199�pnelplLtlon totals IW In tts� Q �
eonu�R ot Nstory(100 y„n ol dim�a d�u}A vdu�of 99 or gn�W rrr�ns �►
tM M+y to August�M-tlrtr rdntatt e�eord wn nufy mateMd or brok�n.A
vdw et 90 rtr�ns th�t grnw�mointa would only b��:pooud orn out of t�n
Y��ra
� ' ' �� , �/il
�
March 10, 1994
Rosemount Mayor, City Council Members,
City Administrator, Ciry Engineering,
Chauman Utilities Commission
2875 145th ST.
P.O. Box 510
Rosemount, MN 55068
Copy: Neighbors along Colorado Ave., Rosemount
Attn: Sue Walsh, please distribute to those addressed.
On December 21, 1994, some of the neighbors discussed with the City Council the drainage
issue along the east side of Colorado Avenue in Rosemount. At this meeting we once again
appealed to the Council to help provide a solution to the drainage problem. We left with the
understanding that the Council recognized the need and accepted the responsibility to take
additional action to solve the problem. We also left with the understanding that the City
would respond in writing by the end of February with the action it plans to take. These
items were confirmed through subsequent telephone conversations with two members of the
Council. It is now mid March and we have not heard anything from the City regarding this
issue. We are therefore requesting that we be placed on the City Council agenda for
April Sth to get an update and to discuss the City's plans.
On March 4 and 5, 1994 we had some warm temperatures and the snow was beginning to
melt. At night it was cold enough to freeze which resulted in a good deal of ice build up
along the slope of the back yards. I came home from work Friday night, March 4th and
realizing water was within 1 foot of my foundation, first took photographs and then with the
assistance of two neighbors chipped ice at the drain, both sides of the bicycle path and along
a couple of back yards. Water flowed pretty good and after a day and a half water was 10 ft
from the house and appeared to be unrestricted. The current situation is that there is ice,
approximately 5 ft. across, all along the swale. If we get a generous March snow fall this
could present a situation needing attention and I may have to take personal time off work to
monitor the situation. This should not be necessary if the design was correct!
The neighbors have been maintaining all along, since June of 1993 when I moved into the
property, that this design will not work. My job requires that I travel and if I had been out
of town over the weekend of March 4th, and I believe the pictures can substantiate this, that
water would have been up against my foundation and it could have resulted in a wet
basement! I should not have to stand guard over the yards during the spring to ensure water
is unimpeded and freely flowing toward the drain! What more evidence do you need that
demonstrates this design is inappropriate?
We are requesting that you, as elected officials who SHOULD be serving the residents of
Rosemount, review this situation and discuss it with us on the April Sth council meeting.
What does it take to get action? Damaged homes?
For The Neighbors Along Colorado Ave:
L�_
Dan H nscom
14866 Colorado Ave.
Rosemount, MN 55068