Creekview Add PD-CS 871120 (2)- Kimley. HornandAssociates, Inc. 12660CoitRoad, Suite200, Dallas, Texas75251-(214)386-7007-
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Mr. Kevin Peiffer
Ginn, Inc.
17103 Preston Road - Suite
~ck ~x 118
Dallas, Texas 752~
re: Creek View Addition - Floodplain Study
Grapevine Creek - Coppell, Texas
Dear Mr. Peiffer:
We have completed a review of the above floodplain reclamation study at
your request. Our review has been completed principally to determine
general compliance with the City's Floodplain Management Ordinance.
Follwing are comments on this review.
We did not receive the requested plat to compare finish floor elevations
with stipulated requirements; however, the Table 4 of the report includes
recommended elevations which are in compliance.
A comparison of water surface elevations indicates increases extending
beyond the project limits. We agreed in a meeting at your office with John
Karlsruher, Shohre Daneshmand, and Dennis Johnson that, with proper
justification, increases may be accepted in the project reach; however, the
acceptability of such increases does not extend off-site. Therefore, ,.
either a variance request must be made or other provisions made to correct
or justify (to the satisfaction of the City) these off-site increases. It
may simply be a matter of modeling technique, so at this point I do not
believe the apparent increases should stop the platting process. However,
construction plans should not be approved before this issue is worked out. ;
As noted in the report, velocities are higher than what can be considered
non-erosive at several locations. If the City believes the justification
for not improving/correcting velocities is acceptable (see pages 5, 6 and
Building client relationships since 1967 "
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November 20, 1987 - Page 2
Mr. Kevin Peiffer
9), provision should be made with slope-failure and/or stream meander
e~sements to allow for failures or meanders related to high velocity
erosion.
If you have any questions on the foregoing, please call.
Sincerely,
Kimley-Horn & Associates, Inc.
Carl V. Anderson, PE
Vice President
cc:Dennis Johnson, Nathan D. Ms, ier C. onaultir~ Engineers, Inc.
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