WA9902-CS010802 A C E N T U R Y O F S E R V I C E ~
FREESEoNICHOLS
August 2, 2001
Mr. Ken Griffen
City of Coppell
255 Parkway Blvd. =
Coppell, Texas 75244
Re: Additional Copy - Floodplain Study
Dear Mr. Griffen:
Per your request, attached is an additional copy of the Floodplain Study of Sandy Lake Road and
MacArthur Blvd. If you should require any additional information or should have any questions
pertaining to this study, please contact us. :
Sincerely,
Office Administrator
Attachment
Freese and Nichols, Inc. · Engineers · Environmental Scientists · Architects
1701 North Market Street · Suite 500 LB 51 · Dallas, Texas · 75202
214-920-2500 · Fax 214-920-2565 · www.freese.com
A C E N T U R Y O F S E R V I C E
November 27, 2000 ~ ~
FREESEoNICHOLS
Mr. Kenneth M. Griffin, P.E.
Director of Engineering and Public Works
City of Coppell
255 Parkway
P. O. Box 478
Coppell, Texas 75019
Re: Computation of Flood Storage for a 2 Acre Site South of Sandy Lake Road and
East of McArthur Blvd. In the Elm Fork of the Trinity River Floodplain in
Coppell, Texas
Dear Mr. Griffin:
We are pleased to provide this report to identify the required storage compensation
needed to fill a 2-acre site to one foot above the 100-year design floodplain as determined
from the 100-year and Standard Project Flood (SPF) as computer by the Corps of
Engineers and reviewed by the Federal Emergency Management Agency (FEMA), and
currently awaiting final approval to calculate storage compensation. The storage
compensation allows a 15% reduction in 100-year flood storage and a 20% reduction in
the Standard Project Flood (SPF).
The drawing on the following page shows the site.
Freese and Nichols, Inc. · Engineers · Environmental Scientists · Architects
1701 North Market Street · Suite 500 LB 51 · Dallas, Texas · 75202
214-920-2500 · Fax 214-920-2565 · www.freese.com
Using the new floodplain information the existing and developed volumes of storage
were calculated. They are as follows:
100-year existing condition volume N/A above 100-year
SPF existing condition volume 3.32 acre feet
100-year existing condition allowable volume N/A above 100-year
SPF existing condition allowable volume 2.66 acre feet
100-year proposed condition volume N/A above 100-year
SPF proposed condition volume 0.92 acre-feet
Required storage mitigation 100-year N/A above 100 year
Required storage mitigation SPF 1.74 acre feet
If this area is developed after the new FEMA information is finalized no storage
compensation will be required since the area will be outside the 100-year floodplain.
We have been coordination this information with all parties involved. Now that the
information is complete this project can be finalized.
Let me know if we can provide additional information.
Sincerely,
FREESE AND NICHOLS, INC.
Ronald W. Morrison, P.E., C.F.M.
Drainage Discipline Leader
xc: File
July 23,2001
Ron Morrison, P.E.
Freese & Nichols, Inc.
1701 North Market Street, Suite 500 LB 51
Dallas, Texas 75202
RE: Flood Study on Sandy Lake Road Water Tank site
South of Sandy Lake Road and East of MacArthur Blvd. on the Elm Fork of the Trinity River
Dear Mr. Morrison:
This letter is written as a follow-up to our June 27, 2001 telephone conversation concerning an
invoice the City received for payment of contract for the hydraulics of the City's water tank site on
Sandy Lake Road. In November of 2000, the City entered into a contract with Freese and Nichols
in an amount not to exceed $1000 to provide hydraulic analysis of the City's water tank site on
Sandy Lake Road.
To date, we have not received a copy of that study, however, we have received outstanding invoice
notices from the accounting office of Freese and Nichols. We are nearing the end of our budget
year and this amount will be paid fi'om my budget. Please provide a copy of the study so that the
City can process Invoice No. 584001 for paymem in the amount of $837.50.
If you should have any questions please feel free to contact me at your convenience. If not, I
anticipate receiving the study in the very near future..
Sincerely,
Director of Engineering and Public Works
cc: Jane S. Jenks, Office Administrator
file/floodplain/morrison072301 .doc
255 pARKwAY 1~' p.o. BOX 4'78 ~ CoPPF. t-I- TX '/5OI9 ~ YgL 9'12/462 0022 A' FAX 9'72/304 31573