Wellington Place-CS 951116 Mort:son Hydrology/Eng eering, Inc.
210 Arnold · Arlington, Texas 76010 · Metro (817) 461-0321
November 16, 1995
Monsignor Broderick
St. Martin de Porrea, Inc.
3725 Blackburn
4th Floor -~'~ ....
Dallas, Texas 75219
Summary of Recommendations to Reduce Flooding at the Wellington Place
Apartments, Coppell Texas -
Dear Monsignor Broderick:
As you know, we are in the process of completing a study to identify a
feasible approach to reduce the flooding at the Wellington Place Apartments.
Mr. Joe Dingman asked that we provide a short summary of the results of our
study. The study report will be provided after we have met with Mr. Ken
Griffin of the City of Coppell staff.
The following is a short summary of our findings thus far.
Summary of Approaches to Reduce Flooding
at the Wellington Place Apartments
1. Improve the existing wall along the north side of the apartments. This
includes the following:
a. Obtain structural verification that the wall will withstand up to
three feet of stormwater or provide details of needed
structural improvements.
b. Waterproof a portion of the wall by coating it with
hydraulic mortar or other coating and fill in the open portion at
the bottom of the wall.
2. The property to the south of the apartments is to be filled as part of a
proposed development. This will block the floodplain from that portion.
Page -2-
3. An interior pump system is to be constructed that includes~
a. Submersible waste/storm water pump capable of pumping 1 cubic foot
per second.
b. Electrical wiring for automatic pump operation during stormwater
conditions.
c. Pump housing including an in-ground six foot diameter reinforced
concrete pipe.
Modify the area at the west end entrance of the apartment complex to
...~\~-'~ ~_' . reduce stormwater flow coming from MacArthur Blvd. This modification
would be an earthen berm along the front of the complex and a speed bump
across the entrance drive.
5. A proposed development to the south has planned a channel to carry the
stormwater overflow from south of our project. This channel must be
extended north and along the east side of the apartment complex. This
will require purchase of additional property and grading of a channel.
6. Purchase an additional.area on the east end of the apartment complex and
construct a detention area. This area would generally be slightly less
than one acre. The detention area would be a graselined area with a
berm along the sides at an elevation higher than the 100 year
floodplain.
The above improvements would reduce flooding so that there would be no damage
to the apartments.
The construction cost of these improvements is very difficult to determine at
this preliminary stage. We believe it would be roughly as shown belows
1. Wall improvement (no structural) $12,000.00
2. South property fill by adjacent
developer No cost
3. Pump 7,500.00
4. Entrance modification 3,000.00
5. Channel modification (Does not
include purchase price of the
property) 10,000.00
6. Detention Area (does not include
purchase price of the property) 13,000.00
Total $45,500.00
In addition, there would be engineering and surveying fees for a final study
of these improvements.
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We also recommend a survey of the site to determine if there are any low areas
that may need special consideration. The cost for these unknown improvements
are not included in this summary.
Mr. Lew Lebowitz at 214-369-9362 may be contacted to determine the cost of
purchasing the property east of the apartment. We can provide details of the
size requirements which could be adjusted to keep the purchase at a minimum.
We will contact Mr. Ken Griffin today to arrange a meeting to make sure the
c£ty has no problems with these concepts.
Sincerely,
MORR?SON HYDROLOGY/ENGINEERING, INC.
Ronald W. ~orr~on, ~. ~.
Sen~or Hydrologist