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Flood Mitigation for Warren Michigan

December 6, 2012

Flood Mitigation Assistance or (FMA)
was analyzed in detail back in 2005 .

Flood Mitigation

Flood Mitigation

Local governments know full well:
Footing drains are tied into the city’s sanitary sewers.
When the city drains become overloaded, basements flood.

The report from 2005 was done by
Spalding DeDecker Associates, Inc

It is now almost 2013 and this report is in dire need
of UP-DATING, re-evaluation and modifications.

Macomb County
3.2.21 Warren
http://macombcountymi.gov/OEM/pdf/HMP/Chap3.pdf

Initial data from the FIRM and USGS indicate that it is the
northern-central part of the city that has the most problems
from flooding. These problems will be identified and discussed
according to the sections in which they are located.
Although these sections have extensive listings, local officials
report that most buildings have been constructed slightly above ground
level, and that no specific flood damages have recently been reported
in the city from riverine flooding.

A broader goal throughout the city is one of public awareness
—how residents can get water to drain away from the foundations
of their houses to prevent basement flooding.
Footing drains in houses are tied into the city’s sanitary sewers.
A couple years ago, more than a hundred houses reported
basement flooding. In a typical rainstorm, about 8 – 10% report
basement flooding.
There are a total of about 54,000 occupied housing
units in the city, and those with problems are scattered throughout
the city rather than in any specific area.

The one exception to this is an area with the lowest elevation
that has recurrent basement flooding, on Autumn Lane and Jane Court.
About 10 to 12 houses in this area have had recurrent basement
flooding, with depths of 6 to 12 inches.
Sump pumps have been employed in some of these homes to try to
reduce the amount of damage from these floodwaters.
There is also some residential street flooding in this same area
on Blossom Court, west of De La Salle School, around Common Road.
Depth of the waters is as much as 12 to 18 inches, rendering these
streets temporarily impassable, before it begins to drain off
after 1 to 1-½ hours.

The city’s storm and sanitary sewer systems are separate.
Six to seven years ago, a pumping station at 9 Mile Road and
Schoenherr was upgraded, along with a sewer main, to reduce
basement flooding problems.
Basement sump pumps also helped to solve the problem in many homes.

Section 2 – Just south of 14 Mile Road and the Red Run River,
there is a residential area with six houses and 5 apartment buildings
in a 100-year floodplain. A pumping station just north of there
was built in 1980 but now acts as a dam, and a petition to remove it
has been filed. Raising the grade of the road may also help mitigate
flood problems in this area.

Just south of 14 Mile Road and the Red Run River are about
23 homes and 6 apartment buildings in a lesser-risk floodplain.
At similar risk but a bit more distant is a church building,
two other homes on Hoover Road and some small portions of a
few residential neighborhoods to its west.

Section 3 – To the southwest of this area is an apartment community
on the streets around Bear Creek Drive that contains about
26 buildings and one house in the 100-year floodplain.
A berm is being constructed along the Bear Creek and Red Run River
to try to alleviate flood risks in that area.
South and west of this Bear Creek Drive area are at least two
houses and possibly some industrial buildings in the floodplain.
In the north of the section, along the Big Beaver Creek, 12 houses
and three buildings are in the floodplain,
including — a wastewater treatment plant. —

In the Bear Creek Drive area, there are about 22 buildings
and 4 houses in lesser-risk floodplain areas, with at least
3 more houses and possibly one industrial structure in areas
to the south. In the north and along the Beaver Creek are about
31 houses and 4 buildings.

Section 4 – In the northeast, the Big Beaver Creek has a
floodplain that places some structures at risk.
Two restaurants, a couple of golf club buildings, two other buildings,
and a couple houses are all in the 100-year floodplain there.
There is another floodplain area along the Red Run Creek,
which seems to have 2 commercial and 2 light industrial buildings
(a factory and a warehouse), a bank, a Knights of Columbus Hall,
3 other buildings, and about 25 houses

There are also a few General Motors buildings in this area,
but re-cutting of area topography has doubtlessly allayed risks
to those buildings.

In lesser-risk floodplain areas are 3 buildings by the Big Beaver Creek,
and 4 buildings, about 8 houses, and a large General Motors building.
Lesser-risk floodplains in Warren refer to those somewhere
between 100-year and 500-year assessments on the FIRM.

Section 5 – Area’s like this one that are located west of Mound Round
have had flooding problems greatly reduced by an upgraded bridge
(on Mound Round at the Red Run Creek).
This alteration has resulted in a letter of map amendment (LOMA)
for the area’s FIRM, removing about 90 houses and some other
buildings from the 100-year floodplain.
Nearby, there is a lowlying spot that will have a berm constructed
to help protect the several houses in that area.

Section 6 – As in section 5, there were a few houses that were
originally identified within the floodplain of the Red Run Creek
that are now at lower-risk as a result of the bridge upgrade
at Mound Road which has improved drainage in the area.

Section 7 and 8 – ARE LEFT OUT OF THE REPORT

Section 9 – There are many large buildings in this area that seem
to be in lesser-risk floodplain areas. These are seven very large
industrial buildings, and about 14 other buildings
that appear to be at-risk according to the FIRM.

Section 10 – There is a small business in a 100-year floodplain
by the Bear Creek at Van Dyke and 13 Mile Road.
An office zone that had appeared to be in a floodplain was addressed
by a LOMA and no longer considered at significant risk.

Four buildings and part of a residential neighborhood that had
appeared to be within a lesser-risk floodplain area near that
addressed by the LOMA area probably do not need to be
worried about since their risk is probably now even lower
than is normally identified.

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  1. FEMA 2012 flood revisions Macomb « Red Run

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