Creekview Add PD-CS 890425 NATHAN D. MAIER
CONSULTING ENGINEERS, INC.
April 25, 1989 :; :, ','~,L~
City of Copp~ll
I~e: Creekview Estates"
N/3M No.: 87-5-6~''/
Dear Russell:
Being in receipt of a letter of April §, 1989, from Mr. Steven Morton, we have reviewed the erosion
control placed along the Grapevine Creek bank in the city's easement. We find that the control is
working exactly as expected and protecting the slope of the easement.
As you are aware, we have always maintained that our preference was to keep the banks of the stream
in their natural condition. While this means vertical bank walls and some continual erosion, those are
simply natural stream dynamics.
The expensive and substantial off-site treatment along the creek bank was installed solely at the request
of the neighboring owner, and not as a part of the subdivision plans.
The stream's dynamic nature has always, and will always continue to alter the natural slopes of the
creek. To attribute any specific slope erosion or slope failure of a vertical slope on the outside bend of a
stream bank after a series of particularly heavy rains to other than stream dynamics would be difficult.
The installed protection worked particularly well during that same heavy flow period.
Sincerely,
NATHAN D. MAIER
CONSULTING ENGINEERS, INC.
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Nathan D. Maier, P.E,
NDM/rdp
Three NorthPark 8800 N. Central Expwy.. Suite 300/Dallas, Texas 75231/{214) 739-4741