HomeMy WebLinkAbout5.a. Accept Section 30 Engineering Study Report on DrainageENGINEERING REPORT
FOR
STORM SEWER IMPROVEMENTS
IN
SECTION 30
CITY PROJECT NO.
ROSEMOUNT, MINNESOTA
OCTOBER 6, 1987
SEH FILE NO: 88026
I hereby certify that this report was prepared
by me or under my direct supervision and that I
am a duly Registered Professional Engineer under
the laws of the State of Minnesota.
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DATE: October_2, 1987 REQ_. NO. 12691
REVIEWED BY: 'V
DATE:
TABLE OF CONTENTS
TITLE PAGE
CERTIFICATION
TABLE OF CONTENTS
LETTER OF TRANSMITTAL
AUTHORIZATION
SCOPE
DATA AVAILABLE
GENERAL BACKGROUND
PROPOSED IMPROVEMENTS
ENGINEERS ■ ARCHITECTS ■ PLANNERS
October 2, 1987
222 EAST LITTLE CANADA ROAD, ST. PAUL, MINNESOTA 55117 612 484-0272
Honorable Mayor and Council
City of Rosemount
2875 145th Street West
Rosemount, MN 55068
RE: ROSEMOUNT, MINNESOTA
SECTION 30 STORM SEWER
SEH FILE NO: 88026
Attn: Rich Hefti, City Engineer
Gentlemen:
In accordance with your authorization we have prepared the
attached engineering report which supplements our Report on
Drainage Improvements in Sections 19 & 30. This report provides
a comprehensive plan for future storm sewer construction in the
southwest quarter of Section 30. This report includes a general
discussion and drawings, however, no cost estimates have been
provided at this time.
We would be available to review this report in detail with you
upon request.
Respectfully submitted,
SHORT-ELLIOTT-HENDRICKSON, INC.
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Steve Campbell
SDC/cih
Enclosure
SHORT ELLIOTT ST PAUL, CHIPPEWA FALLS,
HENDRICKSON INC MINNESOTA WISCONSIN
AUTHORIZATION -
On September 1, 1987 the Rosemount City Council authorized the
preparation of an engineering report for the construction of
storm sewers in the southwest quarter of Section 30 in the City
of Rosemount.
SCOPE
The purpose of this report is to provide a comprehensive plan for
the construction of storm sewers to provide service in the
southwest quarter of Section 30. This report is prepared as an
expansion of the Report on Drainage Improvements for Sections 19
and 30 which addressed trunk storm sewer and storage improvements
within the Hawkins Pond drainage district. Although no
improvements are proposed in the immediate future, this report
intends to provide a cost effective plan for the ultimate storm
sewer needs of this area.
DATA AVAILABLE
Information and material used in the preparation of this report
include:
1. Report on Drainage Improvements for Sections 19 and 30
(Revised September, 1987).
2. City of Rosemount construction record drawings.
3. City topographic and base maps of Section 30.
GENERAL BACKGROUND
The study area consists of the southwest quarter of Section 30
and is bounded on the north by 145th Street, on the west by the
Apple Valley corporate limits, on the south by County Road 42 and
on the east by the proposed Shannon Parkway, which is currently
under contract. This area is located in the Hawkins Pond
Drainage District as shown on Drawing No. 1. The drawing also
shows the adjacent drainage districts which have been established
in western Rosemount.
- 1 -
The study area consists primarily of single family residential
units and a proposed industrial park along the westerly edge. It
has been divided into subdistricts as shown on Drawing No. 2.
This area includes four small retention basins which are located
in subdistricts B4, C, D1 and D2 as shown. Storm water runoff
from the study area is directed to these basins by means of
inplace storm sewer and surface facilities.
The proposed Hawkins Pond (30-P1) retention basin is located
north of 145th Street as shown on Drawing No. 2. This facility
is proposed to serve as a major storm water storage basin in the
drainage district.
PROPOSED IMPROVEMENTS
The proposed storm sewer construction to serve the study area is
shown on Drawing No. 2. The proposed construction consists
primarily of two storm sewer systems which transport runoff from
the small retention basins in subdistricts C and D-1. These
systems are combined at 145th Street and discharge to Hawkins
Pond in a common pipe. The proposed storm sewer will serve to
eliminate the retention basin in subdistrict C as well as to
provide positive drainage fromtheD-1 basin. Flows from the D-2
basin are carried to the D-1 basin by means of a proposed culvert
under Dodd Boulevard. This will in effect change both the D-1
and D-2 basins from retention to detention basins allowing them
to drain immediately after a storm event by means of the storm
sewer rather than by percolation. The B-4 basin can be
eliminated by discharging into the proposed Shannon Parkway storm
sewer.
In addition, several minor additions or modifications to the
inplace storm sewer are proposed to improve drainage in localized
areas. In accordance with city policy, these facilities are
designed to transport runoff from a 10 year storm event.
- 2 -
In areas where the proposed storm sewer is not located in public
right-of-way, easements should be acquired from adjacent property
owners. These easements should provide a 10 foot area on each
side of the pipe for operation and maintenance of the lines.
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