7. Accept Stormwater Mgmt Plan l
I CITYOF.,
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,� ; - CHANHASSEN
. :° 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
-.f. (612) 937-1900
MEMORANDUM 433(22
ITO: Don Ashworth, City Manager -
FROM: Gary Warren, City Engineer ������ "
IDATE: January 7 , 1988 _ .-
ISUBJ: Stormwater Management Plan Acceptance / /a /I7_. ---
Public Works File #048 ' ` __.
IAs a part of the downtown redevelopment project, the City com-
missioned Barr Engineering Company to prepare a stormwater manage-
ment plan for the general area north of Lake Susan between
IAudubon Road and Rice Marsh Lake and north to West 76th Street,
not including the Chanhassen Lakes Business Park area. This is
shown on figure #1 of the attached report.
IThis report addresses the capacity of existing systems , prelimi-
nary design of stormwater storage facilities, preliminary loca-
tions and sizing of trunk storm sewers, and the location of
Isedimentation facilities to minimize impacts on water quality as
urbanization of the watershed area continues.
IIdeally, the City should have a document such as this prepared
for the entire community. It serves as the basis in providing
staff and the council with a document to guide us in preserving
and acquiring drainage ponding areas and conveyance areas for
Iproperly dealing with stormwater management. Figure #2 of the
plan summarizes the key results of the study.
I This plan has already been useful in dealing with the sizing of
the stormwater retention basin for the downtown redevelopment
project and currently is being utilized in working with the
I establishment of a stormwater storage area on the east end of the _
study area along the county line between West 78th Street and the
railroad tracks .
II Since this document serves as the foundation for key decisions
relating to land acquisition and ultimate construction of facili-
ties, it is appropriate for the City Council to formally adopt
I this plan as a guide to be followed for stormwater management
within the study area. The Council has budgeted for a similar
study to be done in 1988 . These plans will ultimately be
II
I
Don Ashworth
January 7 , 1988 -
Page 2 '
integrated into the City' s comprehensive watershed management
plan to comply with the Chapter 509 requirements of the State.
It is therefore recommended that the City Council accept the
stormwater management plan as prepared by Barr Engineering dated
September, 1987 , and that this plan be adopted as a guide to
dealing with stormwater management within the study area.
Attachment: Stormwater Management Plan
. 1
. I